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#703712 - 08/02/17 7:46 pm A65 timing side bushing service info needed  
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Ron C Offline
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Ohio
Looking for someone in the Ohio area that is able to line bore the timing side bushing on my A65. I do my own work but I do not have the equipment for this. I could always just install it and pray that is is aligned but I want to do this the right way.

I did a quick google search and did not see to see much in the way of shops that can do this work in ohio. Any recommendations?

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#703721 - 08/02/17 9:18 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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I would try E & V Engineering who have a huge reputation and experience with BSA's.

They are not in Ohio but Howard City Michigan, so not too far away, see This Link


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#703739 - 08/02/17 11:38 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bodine031 Online content
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The Ohio Valley BSA OC rally is this week end in Toronto Ohio I would think there would be the BSA folks in the know

#703822 - 08/03/17 4:39 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bodine031 Online content
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got to thinking about this, if you bore the bush straight and take out material how do you make up the diff on the crank?? On non Twin Cam HD the pinion side you make up the diff with over size rollers. I guess you would bore the case half and find an Oversize OD bush. I think Kibblewhite had them for the later engine. keep me posted on what you find out

#703824 - 08/03/17 5:27 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Allan Gill Offline
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Rotherham - S. Yorkshire
You grind the crank till it's round then get the next bush undersize and team to size.


beerchug
#703838 - 08/03/17 6:45 pm Re: A65 timing side bushing service info needed [Re: Allan Gill]  
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Ron C Offline
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Ohio
After a bit of research I think I am going to attempt this myself. I have access to a machine shop. At the very least I can mount the motor cases in the mill and with a dial indicator and a lot of patients I should be able to determine how well match the current bearing and bushing match up.

if the crank does not need ground, which I am hoping is the case, are the all of the bushing undersized and you just ream them to clearance? I am assuming that is how it is done.

#703842 - 08/03/17 7:03 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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DMadigan Offline
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ca, us
I would use the existing bush as a trial piece to get the speeds and feeds right, also to dial in any spring back of the cutter. Are you using an adjustable reamer or a boring bar? Without the right cutter a boring bar will leave raised hairs on the surface.

#703844 - 08/03/17 7:10 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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argyll. scotland, uk
Watch this , https://www.youtube.com/watch?v=Lg5AcTqq_9g
its an A10 but the set up is the same.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#703845 - 08/03/17 7:19 pm Re: A65 timing side bushing service info needed [Re: gavin eisler]  
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Ron C Offline
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Ohio
Thanks for the link! That is the video that made me realize I have everything I need to do this sitting in my shop.

#703921 - 08/04/17 2:46 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ray Elliott Online content
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Ron C - Some of my experience over the last few years:
If you heat your oven to 300f the bush will come out easily. If you heat to 325f the bush will almost fall out. Chill the new bush before dropping into the hole. Use
some good heat resistant gloves so you can fit it properly (that is, not get it crooked & have to knock it out).

The machinist in the video turns an undersize plug & checks the bushing against the plug. I found this so invaluable that I made up plugs in several sizes. Once it is close start paying very close attention.

I buy Kibblewhite -0.030" bushings. If you buy a -0.010" bush you may have have enough 'meat' to correct concentricity issues. Many recommend against the solid brass bushings, but most of us aren't riding all that much.

After you create your setup for timing side case, make certain that you can fit & remove the upper case without disturbing your setup. This can be a challenge. Check your concentricity measurements between the drive side race & timing bush several times. If you're lucky they are Concentric.

For fixing to the mill bed, I put the case on parallels, use a bolt through the crankcase itself & a clamp against the tranny drain plug.

I find that I get a really good cut at about 360~380 rpm.

I measure my crank timing face for roundness. Unless the crank is badly worn, I'll cut the bush to about 0.004" smaller than the crank. Then I have the crank ground to give me 0.0015" clearance. If you're certain that the crank is round just machine the bush to the appropriate size.

It is tedious. But once complete it is satisfying.


Ray Elliott
---
A65, A70, A75, T120, T140, T150, T160
#703927 - 08/04/17 4:06 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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KC in S.B. Online content
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Good training Ray! Thanks for that , the shop that has done mine used a.Vertical mill. It looks easy, but like anything else the setup and preparing are the key.


Down to 1 BSA, 2 Triumphs, 2 '56 Chevys
#703932 - 08/04/17 4:54 pm Re: A65 timing side bushing service info needed [Re: Ray Elliott]  
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Ron C Offline
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Ohio
Thanks for advice Ray. That is exactly what I was looking for.

I do have an oven that i use for powder coating that will be perfect for this. I have a real machinist that will help on this, Biggest problem I have at the moment is trying to figure out the year of the motor. The title says it is a 1965 rocket, however when I tore into it over the winter it appears to be a mixed motor. Serial on the motor is "BSA A 50 B960" which does not seem to match any of the documents I have read concerning its year. I know this is not a 1965 bottom end, it has a "DD" oil pump and the oil line has three outlets which is a later model then a 1965. When I get into the bottom end I will look for some case markings to determine if I can get a better idea of its actual year.




Last edited by Ron C; 08/04/17 5:45 pm.
#703938 - 08/04/17 5:46 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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According to the BSA Owners Club UK website, engine number A50 B960 appears to be a 1965 A50CC CYCLONE COMPETITION, see This Link, so it looks like it is a 1965 bottom end as well as being 500cc as opposed to 650cc.

Might be worth checking the bore and stroke to see if the larger 650 barrels and head have been fitted at some point.

The DD oil pump was fitted to later A65 models as it has larger gears and a stronger body, so a worthwhile upgrade but not necessarily an indicator of the cases build year.

Last edited by gunner; 08/04/17 5:51 pm.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#703942 - 08/04/17 6:10 pm Re: A65 timing side bushing service info needed [Re: gunner]  
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Ohio
Good catch, I did not see that link, in my prior searches. Thank you

It does have larger 650 barrels and a A65 dual carb head, I actually had it bored .010 over this past winter and had a valve job done as well. I am kicking myself because I should of done the Bushing then, I knew better, because everything on the top end was wore out. I am going to replace the rod bearings as well, since I am already going to have it apart.

#704010 - 08/05/17 2:08 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ray Elliott Online content
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I suggest replacing the tranny bearings, at least the needle bearing, while you have the case warm.


Ray Elliott
---
A65, A70, A75, T120, T140, T150, T160
#704056 - 08/05/17 5:16 pm Re: A65 timing side bushing service info needed [Re: Ray Elliott]  
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Ron C Offline
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Well it is official. Timing side clearance is 0.003 and the crack end play is 0.01. Guess I will tear her down today.

While I have her completely down what else should I change, besides the sludge trap, rod bearings and drive bearings?

#704060 - 08/05/17 5:40 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Use new good quality big end bolts. Leave the cam bushes well alone even if they appear slack on stripdown when the cam is unsupported at both ends, check cam for play in assembled cases, there is usually none, maybe replace idler pinion bushes if very worn.
While its all apart , check the oil pump flange is flat, usually there is pull up around the mounting studs, check the oil pump NRV ball seat, a decent magnifying glass will tell all, mine looked like a ploughed field, lap a sacrificial ball in to the seat with some grinding paste and flush out the pump or rebuild after. Even better fit a whole fresh new oil pump.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#704075 - 08/05/17 9:34 pm Re: A65 timing side bushing service info needed [Re: gavin eisler]  
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Ron C Offline
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Ohio
Well a bit more sad findings. It appears I lost a portion of the valve train mount. The most important one which supplies oil to the entire top end. I found many of the parts in the pushrod hole but they have been chewed up pretty well. I can not imagine welding this, prob look for a new head and redo the valve job.

Serious bummer

[Linked Image]

Last edited by Ron C; 08/05/17 9:47 pm.
#704099 - 08/06/17 8:30 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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Don't know if this is possible but here's an idea, you mill the broken area flat and then machine a steel replacement to sit on top, rather like a conrod big end cap.

The replacement would be held in place by bolts so you would have to drill into the head and have enough depth for them to be threaded. Avoiding the oil line could be a problem, maybe two small bolts either side would work?

Anyway just an idea to help save an otherwise good head.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#704112 - 08/06/17 1:19 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Allan Gill Offline
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Rotherham - S. Yorkshire
A good machine shop should be able to remake that section. Weld and line bore to make it like new. My local shop is redoing a front gallery side mount for one of my heads which I bought. It had been repaired but the hole not finished properly, in my case they will sleeve it.


beerchug
#704140 - 08/06/17 5:25 pm Re: A65 timing side bushing service info needed [Re: Allan Gill]  
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Ron C Offline
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Ohio
Allan,

it the head weldable? I am assuming it is cast aluminum with a lot of oil contamination.

#704141 - 08/06/17 5:28 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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kommando Online content
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Scotland
Brit bike cases weld very well according to my welder, he would complain if not wink

#704160 - 08/06/17 10:01 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Those heads are cheap as chips in the 'states it's not worth the messing about welding it and then
machining it.



#704205 - 08/07/17 7:58 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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BSA_WM20 Online content
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Originally Posted by Ron C
Allan,

it the head weldable? I am assuming it is cast aluminum with a lot of oil contamination.


I gas weld alloy without any problems ( now that I have Tinmans excellent lenses ) because it is slow and the impurities just burn off and float o the surface.
The problem comes with electric welding which is very violent and anything that is liquid ( like pores with oil in them ) explode .
If it is a big bit of liquid to pops and blows molten alloy every where is if is very small it makes a void in the weld.
Electic welders also seem to be unable to properly warm the cases which causes too much chill and the welds fall out.
Torch welding lease the part fully solution heat treated and fairly soft
Electric welding leaves the part quite hard .
You often see beads of MIG on alloy plate tp stiffen it .


Bike Beesa
Trevor
#704208 - 08/07/17 10:21 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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Mark Parker Offline
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MAP make some nice steel 'H' section rods hardly any heavier than stock alloys which fatigue. At the price I wouldn't buy new bolts and nuts I'd buy new rods.


mark
#704210 - 08/07/17 11:23 am Re: A65 timing side bushing service info needed [Re: Mark Parker]  
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Allan Gill Offline
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Rotherham - S. Yorkshire
Originally Posted by Mark Parker
MAP make some nice steel 'H' section rods hardly any heavier than stock alloys which fatigue. At the price I wouldn't buy new bolts and nuts I'd buy new rods.


Thats my sentiments. Although I have been sticking with Alu' rods (from Thunder engineering) I guess if they are fine in racing vehicles my A65 will be fine with them too, and have been. I took one rod out of commision when I ran the motor dry of oil, it had locked the crank with the material from the shells, and made a rough apearance to the rod face. When i cleaned up the ARP bolts I could see that they had received enough heat and stress to turn them blue and purple. I replaced the rod and happy days, but I still think that had I been using the stock rods that they would have certainly failed and took out my barrel and crank cases with it.


beerchug
#704216 - 08/07/17 1:14 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ron C Offline
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Ohio
Ok parts list is coming along, I have a couple of questions as I get deeper into this and start trying to figure out what is causing what.

First question.

crank end play, was measure at 0.01 which seems way more then it should be. My Haynes manual does to give any specification for the Crank end-play/runout, I would expect that to be in the 0.001-0.002 range? Since it is 0.01 the only thing that I can see that would cause that is the roller bearing? It looks to be in good shape, and shows no sign of wear but the crank end play has be worried. Should I replace this as well?


Second question.

Seems to be two types of timing side bearings.

The original BSA version which is VP23 Copper Lead Lined Strip, and are super cheap, Appears to be original`

Then there are ones that are solid brass made by Kibblewhite

and finally ones that are steal with a brass insert. Steal/Brass

The problem I see with the second two choices is that they look a bit different from the bushing that is currently installed. There is a separate thrust washer on my setup, which seems to have been machined into these two types of bushings. Am I missing something here?

Any advice on which way to go on this?


With that said anyone know what the service limits are for the Crank on the timing side? My book does not talk about them I assume that is because I line bore the bushing to fit anyway. I know that is is Concentric but that is about it.


As far as the head goes I have that worked out. I could get one from eBay, there are several, my current head I just replaced the valves, springs and guides so I would hate to waste that and start over.


One last question, where do you guys source your parts in the us? Seems to me that British Bike Bits have the best prices since I do not have to pay the VAT tax being in the US.

#704224 - 08/07/17 3:31 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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I have no idea which type of TS bearing material is best, I believe its more important to get the drive and timing sides Concentric and also use an oil filter together with regular oil changes.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#704228 - 08/07/17 4:11 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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DMadigan Offline
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The bushing is bronze, not brass. The steel backed one is preferred because it is more rigid, just like the rod shell bearings.
The service limit on the crank is what is available in under size shells. Since shops did not just clean up the journal and bore the bush to fit originally there were only two main sizes available. A10s have a smaller main so you could easily go less than the -0.020"
Is this originally a ball or roller drive setup? The roller has a cup with shims with a thrust washer inside the timing bush (separate piece) to set the end play. Ball does not need any of this. There are different case widths between the two.
Aluminum rods work fine and last for years if not used for racing. Make sure the drive side has the small bleed hole.
You have to see which is cheaper, another head and valve work or welding/machining your head. I am not sure there is the need for the small through hole and split pin in the rocker shaft mount. The oil is going to be sprayed around from the ends of the rockers and flung off the springs anyway. Plus the rockers are drilled to the pushrod pin to feed oil there (maybe not on early rockers?)

#704232 - 08/07/17 4:20 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bodine031 Online content
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melbourne florida
6+ years on my 64 Hornet engine. Kibblewhite bronze bush. Valvoline 60wt "R",MAP oil filter, Uses a Trident filter,Small oil cooler. Single carb head with 32mm kuni, Boyer with 3 ohm dual tower dual fire HD coil, Solid State Reg/Rect. Always ride it 7-10 miles get oil to temp and I don't beat the [censored] outta it cause I don't want to fix it. Bike is reliable and used 3-4x's a week
PS I have a spare 68-72 T-Bolt head bare and in nice condition. you are welcome to if you want it N/C

#704250 - 08/07/17 8:39 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bon Online content
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With all the trouble these bushes cause, why not spring for an end-feed/roller bearing conversion and forget all about it ?

#704430 - 08/09/17 2:39 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Andy Higham Online content
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I agree the end feed/roller conversion is the ideal course of action.
I have to disagree about the bushes, the 2 parts of the 2 piece bush are not located not located relative to each other. The inner can creep inside the outer blocking the oil holes, starving the bush and the big ends of oil with disasterous consequences. Don't ask me how I know, even after 30 years it's still raw.


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
Modified Nu-Trak GM500cc sprint/LSR bike "Deofol"
2003 Aprilia RSV Mille "Lo Stregone"
#704431 - 08/09/17 3:03 pm Re: A65 timing side bushing service info needed [Re: Andy Higham]  
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Ron C Offline
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Ohio
Perhaps I have not poked around enough on the end feed, bearing conversion. Are there any links you can point me too. I am not too interested in sending to SRM or another shop. I would rather do the work myself, that is why I was going the bush route.

#704437 - 08/09/17 4:36 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ray Elliott Online content
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Ron - I've not done an SRM conversion (NKIB 5907 C3 bearing) but have done one using a NKIS30 C3 roller bearing. I wasted 3 crankshafts getting it correct, but it works very well. Hopefully you're a far better machinist than I. Rather than weld the inner timing case I machined a block that screws in place. The block holds the oil seal around the crank quill & I feed the oil externally.

If you'll PM me I'll gladly send you pix & my procedures.


Ray Elliott
---
A65, A70, A75, T120, T140, T150, T160
#704440 - 08/09/17 5:15 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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DMadigan Offline
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Why waste time and money on an end-feed/roller bearing conversion and go for a full roller crank and rods with 90 degree offset, steel rods and three main bearings? I am probably the only one stupid enough to do this but it solves a lot of deficiencies.
In reality, the bush will last a long time if done right with adequate filtering of the oil and is slightly cheaper.

#704445 - 08/09/17 5:28 pm Re: A65 timing side bushing service info needed [Re: DMadigan]  
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The biggest reason I decided on the bush route because if done correctly, which I am confident I can do, will last and the motor will be reliable. With that said, it might be worth picking up a second motor to play around with.

#704459 - 08/09/17 7:18 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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Farnham, Surrey, UK
Regarding the end feed conversion, there's an interesting article On this Site which describes one of the variations on how it can be done.

My own personal opinion is that the original setup is adequate if you ensure most of the following are present:-
- an oil filter is fitted (commonly in the return line)
- an alloy sump plate with magnetic drain plug is used
- the oil is suitable (e.g. 20W50 classic type with API rating no higher than SG or synthetic motorcycle equivalent such as Mobil 1 V Twin)
- the oil is changed at regular intervals (probably every 1k miles for mineral)
- the OPRV is the later piston type rather than the earlier ball and spring variety, this helps maintain better oil pressure
- the crank sludge trap has been recently cleaned, these have a habit if filling rapidly unless an oil filter is fitted
- the crank is correctly shimmed to take up end play if a drive side roller is being used, a shim cup supposed to be fitted between the DS roller and crank to ensure exact end float
- the TS bearing is Concentric with the drive side and the TS journal has the correct clearance with the bearing
- the oil pump is operating efficiently with no leaks, preferably using a later DD type or iron bodied, see BSA A50/A65 installation tips At this Link

Converting to an end fed crank is certainy a good idea, however I believe the original setup will work OK if detailed attention to the above is made and this has been the approach I have taken over the last few years. All has been OK so far after admittedly only a few thousand miles.


Last edited by gunner; 08/09/17 7:29 pm.

1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#704480 - 08/10/17 12:19 am Re: A65 timing side bushing service info needed [Re: Andy Higham]  
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Rich B Online happy
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Stone Creek OH USA
Originally Posted by Andy Higham
I agree the end feed/roller conversion is the ideal course of action.
I have to disagree about the bushes, the 2 parts of the 2 piece bush are not located not located relative to each other. The inner can creep inside the outer blocking the oil holes, starving the bush and the big ends of oil with disasterous consequences. Don't ask me how I know, even after 30 years it's still raw.


BSA made a change to install a dowel to the 2 piece bearing to retain the inner bush to the outer steel housing. The early unit twins did not have the dowel. Service bearings for the early unit twins (62 - 65) have an updated P/N that have the dowel.

Not all aftermarket bearings have the dowel installed.

I would not run a 2 piece bearing without a dowel. Not if they fail, but when


Life is too short to drink cheap, bad beer.
#704513 - 08/10/17 12:15 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ron C Offline
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Ohio
Another question to ponder. I am currently running the late model DD pump. It is worth an upgrade to an SRM. From what I understand they use the same internal parts, just have tighter tolerances on the pump body and is less likely to warp. The DD pumps seems to in workable shape. I have had it apart and there was some contact between the internal gears and the cover plate and it tended to bind up when the pump screws were tight. I moved a bit of material from the internal gears to resolve that issue and now there is no binding, so I assume it would pump as normal. It was pumping over 50PSI when the engine was cold.

It the SRM really worth the upgrade?

#704531 - 08/10/17 3:45 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bon Online content
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Originally Posted by Ron C
Perhaps I have not poked around enough on the end feed, bearing conversion. Are there any links you can point me too. I am not too interested in sending to SRM or another shop. I would rather do the work myself, that is why I was going the bush route.




http://bsa-a10.hailwood.com/mybsaa10rollerconversion.html

#704539 - 08/10/17 4:40 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gunner Online content
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gunner  Online Content
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Farnham, Surrey, UK
The SRM pump is certainly worthwhile if you can afford one although I'm led to believe the flow isn't that much greater than original.

Some alternatives to consider:-
- try and find the iron bodied pump as used by BSA from 71 onwards. This pump is rare but was the best of all the A65 pumps.
- It is possible to make the alloy pumps work OK and there's a really good write up on the E&V website on how to install and check your pump, see This Link which explains how to simulate running and visualise whats going on with the pump in situ.


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
#705317 - 08/17/17 4:54 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ron C Offline
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Few more questions. My original plan was to have a -0.01 under bush line bored to my crank, According to my machinist that is not enough, due to misalignment. Since this is a 1965 A50 those bush's are different then the 66 and up. So I am on a search for a -0.03 bush, as quick as possible. Not much luck finding anymore smaller then 0.02 under. These are all Alpha bushings and are limited to 0.02 under.

I see the kibblewhite bushings will go down to 0.04 under, but when I look a those they list the same bush part number for both pre 1966 bush and post 1966 bush. Has to be a typo right? They do not have a real contact number so I can not speak to a real person there, so I can not ask them. but how is it the Kibblewhite bushings span Pre 1966 and post 1966 models?

Any other suggestions?

#705319 - 08/17/17 5:08 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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gavin eisler Online content
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argyll. scotland, uk
A badly worn crank TS journal can be ground down and fitted with a harder sleeve to bring it back to std. Before SRM took over from Devimead with the roller conversion they used to offer this service. Is the TS bush miss-aligned or is the crank journal still oval?
Check your cases are a matched pair, on the lower mount castings there are 3 digit numbers on each side , these should match, if different you have a non matching set of cases and this might explain the miss alignment.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#705320 - 08/17/17 5:17 pm Re: A65 timing side bushing service info needed [Re: gavin eisler]  
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Ron C Offline
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The Crank is with in spec it is 0.0002 out from inside to out. The problem is the 0.01 under TSB that does not have enough meat on it to make alignment. I talked to Kibblewhite on the phone and they assure me that their bush will work for a 1962 thru 1970 A50. Everything I see says they are different bushings but these are also the Alpha bushings. So I am hoping kibblewhite knows what they are talking about. Either way I will know tomorrow

#705382 - 08/18/17 11:22 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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NickL Offline
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Aus
Try JH Motorcycles in Watford UK. If they are still going, i saw them selling off some of their stuff a while ago.

They used to make VERY good bushes for the A65 using the correct inner material and steel outer and did sizes down to about 0.060


OR
SRM are doing solid bronze ones
http://www.eBay.com.au/itm/BSA-A50-A65-timing-side-main-bush-solid-phosphor-bronze-30-under-size-early-typ-/282327767943?epid=1048476199&hash=item41bc0bdb87:g:xXEAAOSwd0BV3GQ6

Last edited by NickL; 08/18/17 11:24 am.


#705395 - 08/18/17 2:54 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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bodine031 Online content
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melbourne florida
Yes they do

#705400 - 08/18/17 4:19 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ron C Offline
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Ohio
I just received the bushing that the sales rep from Kibblewhite promised would work on a 1965 A50, and it is not even close. Wasted that overnight charge. The outer diameter for the TSB is much larger for the 1965 and earlier models.

Bummer

#705417 - 08/18/17 6:42 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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John Healy Online content
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Boston, Massachusetts
I have been following this thread because we distribute Alpha BSA timing side bushes (up to .030") for the A7-A10, up to 1965 for the A50 - A65 to 1965 and for the 1966-up for A50 - A65.

Quote
Watch this , https://www.youtube.com/watch?v=Lg5AcTqq_9g its an A10 but the set up is the same.


I sat through this video, and sat while he bumbled around. He makes two omissions worth noting. First he assumed that when you lay the drive side crankcase on the table, that the gasket surface for the timing cover is parallel to the crankcase center line surface. They rarely are and can effect the outcome.

Also, the surface of the crankcase mouth where the cylinder sits is rarely square to the center line of the crankshaft. Relying on either of these two surfaces to square up the crankcases can lead to poor outcomes. I have found it is wiser to rely on the crankcase parting surfaces to square up the case to the table.

Then with the timing side crankcase strapped to the table and the parting surface clocked to the table you can center on the hole for the bush in the in the timing side crankcase. Then drop the drive side on, securing it to the timing side case and clock the drive side bearing - if everything is right you should clock "0" with your dial indicator on both the x and y axis.

If it doesn't clock "0" either your machine arbor wasn't squared to the table properly, the cases are not squared to the table properly, age and stress has caught up with the cases (aluminum cases sort of drift around with the aluminum aging process and stress), or the factory screwed up.


#705458 - 08/19/17 7:59 am Re: A65 timing side bushing service info needed [Re: Ron C]  
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NickL Offline
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Aus
Just warm the bloody things up if you want to measure movement, they move in all sorts of directions.



#706597 - 08/29/17 2:52 pm Re: A65 timing side bushing service info needed [Re: Ron C]  
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Ron C Offline
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Ohio
Wow, what a difference a non wore out TSB makes. Oil pressure pegs my 50PSI pressure gauge continuously. Incredible how quiet the engine actually is now. What I thought was valve train noise must of been the bottom end.

Thanks to everyone that offered advice. Looks like I will get some ride time in before the leaves begin to change.

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