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#553254 - 07/16/14 6:56 pm Re: alloy barrels for 750 OIF 1971 [Re: Adam M.]  
Joined: Aug 2001
Posts: 3,405
gavin eisler Online content
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argyll. scotland, uk


I am out in the sticks, no soda blasters around, years ago I had the head blasted in a shot cabinet, it came out very clean , but opened all the pores, which made it pick up dirt.

Doesn't look as good as yours after cleaning though, still you can see the blasting effect.
About these valve seats - do they look like 3 angle job ?
No.
They are quite wide and look like make with one seat cutter from factory.
A friend fitted new iron exhaust guides about 15 years ago , he also recut the seats, did a nice job, broad exhaust for heat transfer, narrow inlets, the inlet guides were good, the valves were replaced with high quality stainless items, they will clean up soon.

Are the guides worn?

They are good, not much waggle at more than full lift, I am not changing them.I have thought about having SRM line the guides and recut the seats, but it was running very well before It was stored , so a light freshen up is the order of the day.That can come over the winter, I have limited time on the hydraulic bench at my friends shop and cant leave it hanging around.

The ports are still 3O mm as are the carbs, although some one has removed the inlet guide bosses and deepened the bowl around it.
I intend to give the inlet port a sideways D profile and have slathered epoxy on the floor to cure, there were some pretty coarse joins where the steel spigots ended and the port begins so if nothing else these will be tidied up. Ive half a mind to oval bore the carbs, raising the slide chamber roof to 32 mm but keeping the opening choke the same.


A bit of cleaning tonight,

Freshened the bars and top tube, removed some awful cable ties,


Ah the rare mk V spitfire 750, the crossed flags of Ethiopia and Scotland must have meant something once upon a time.



Some quality key fob rash







Showing the shortened cranked gear lever, old footrest mount and long folding footrest stub needed to clear the motor and kickstart.
I tried rear sets and linkages, but this is more direct and with the 2 turns lighter index spring it is sweet.


Back axle , showing outer spacer, speedo drive and inner spacer.



Oily rag clean, then a bit of polish.


New hoop, it had to be done, the old one was thin in the middle and a spoke had broken, now replaced.



Size details



This is a straight swap for the old tyre, I liked it a lot once I put the pressure up to modern style.

John, I will get the measurements you asked for later, I was in a rush tonight, I will have some time on Friday to get them.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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#553649 - 07/19/14 3:38 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
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gavin eisler Online content
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gavin eisler  Online Content
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argyll. scotland, uk
The epoxy in the inlets has set. got busy with the split dowel sander and dremel.

I have filled the floor , and the groove where the steel stub meets the port.




Cleaned up the valves on the wire wheel.



These were expensive valves , supposedly using F1 materials.
The exhaust valves details on the stem at the collet groove are. "REC V254"

They are in excellent condition, barely worn at all. a slight shine at the thrust areas on the stem but no appreciable wear, I am happy to refit these.



Used this needle file to improve the porting, a teuchter 3 way valve cut, burst the inner corner of the inlet seat with a small chamfer and radiused the seat to cylinder head rim



Showing inlet tract length about 4.5 inches from carb flange to valve centre, also showing modified torque wrench attachment, a kind welder attached a 3/8 drive socket to the 1/2 "ring spanner.



A half decent shot of the inlet port showing valve seat


MMMmmmm flange.


Better check the carbs over, both had the pilot air screws one whole turn out,



Wear ring on needles at pencil tip.



Worn slide , Burlen are getting an order soon, will try the hard anodised lads.




Son Robbie, with his new longboard, he fell off a cliff in May and broke his wrist , leg ( femur now pinned) and fractured 3 vertebrae, it will be next year before he is skateboarding, thats why this rebuild got derailed at the start, he is mending well.



The valves are refitted and the head goes on soon.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#553694 - 07/19/14 9:59 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: May 2013
Posts: 4,533
Allan Gill Offline
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Joined: May 2013
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Rotherham - S. Yorkshire
There's not much epoxy in there Gavin, I'd put a minimum of 4mm upto 8mm deep ( before the seat ) to find any difference.

Those slides are really boogered, what are the carb bodies like? If the slide is worn that bad the bodies can't be much better.


beerchug
#553729 - 07/19/14 2:13 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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argyll. scotland, uk
Hi Allan. thanks for the tip, maybe later , Ive definetely improved some of the stub transitions.
New slides are on order, the bodies arent too bad, there the third set Ive put on.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#553741 - 07/19/14 3:47 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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Adam M. Online content
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Mississauga, Ontario.
Do you have any plans concerning frame painting ?
I powder coated mine and it really changed a look of the bike.
But knowing now you are out in the sticks smile I don't expect you to do anything so complicated.
New tire looks really nice on this alu rim.

Last edited by Adam M.; 07/19/14 3:50 pm.
#553821 - 07/20/14 3:31 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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gavin eisler Online content
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argyll. scotland, uk
No immediate plans for frame painting, its only original once , haha.
In 1982 the swingarm and seat stays got a blow over ( brush up), the swing arm was rebushed at the time. , the front loop hasnt been touched since I got it.I would like it all gussied up but on the other hand this bike has never been pampered, just used it to burn fuel , oil and wear out tyres, pipes, carbs and stuff. Its a bit like an old slipper, well worn, but adapted to its owner.
I may put it on a diet, I have a good 1965 L back light that is a thing of beauty compared to the 71 boat anchor.

Just ordered a front matching hoop and rear sprocket ( SRM) , throttle cable kits ( Venhills), carb slides and rebuild kits ( Burlen). Head going back on soon.

Have tracked down some wee screws for the friction damper in the Tomasseli Daytona 2 C twist grip ( Bevel Heaven).

Fitting the carbs to the flange rubbers with alloy SHC screws M8 with nylocs ( probolt).

Finished NS today, will catch up on kip then crack on.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554016 - 07/21/14 3:01 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
Posts: 3,405
gavin eisler Online content
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gavin eisler  Online Content
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argyll. scotland, uk
Final jobs on the head.


Epoxied in the TS balance oioe stub, it was literally in by a thread



Polished the chambers



Dipped the carbs in the Rhubarb cleaner



Mid way scrub stop




Very pleased with the results, Brown varnush vanishes with a few rubs of the toothbrush.






Oxudes take a little more persistence.
This stuff works a charm, it is a very gentle cleaner, there is a faint fusty smell when using it.
The 65 tail light housing is getting a dip as well.
I will keep this stuff and make a fresh batch for later.

Used this wee tripod that came with a cheap laser level



, for the following pics

A thorough inspection of the carb ,




original float bowl and float holding up well,





viton tipped needle fitted in 1981 shows a wear ring ( getting changed)



Float spindle polished with wear.



Gasket in A1 condition.







Last edited by gavin eisler; 07/21/14 3:44 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554206 - 07/22/14 5:35 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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argyll. scotland, uk
Old needles pointing to float pivot zones, gasket must not interfere with float movement, this one is good.



Showing float travel and sawn off clothes peg clip to keep the gasket down.





Checking throttle spring length




Its short, should be 3 inches.


The rhubarb dip has improved the look of the old slides.


Set up a multimeter on the 2000 mV scale to show electrolysis between cooking foil and rusty mudguard/fender with Oxalic dip as electrolyte, Max reading was 250mV.



Found an original 71 rear mudguard in the shed with a 65 lamp housing.


Carburettor beetle


Carbs rebuilt, showing 65 rear light after a dip, still awaiting the postal race, ordered stuff on Saturday, Venhills in first with Throttle cable kits arriving today Tuesday , still waiting for Burlen , SRM, ProBolt, and others,



Last edited by gavin eisler; 10/25/14 10:53 am.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554331 - 07/22/14 7:56 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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gavin eisler Online content
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argyll. scotland, uk
Spent some time making new throttle cables
Using an MTB brake noodle to give a cleaner entry



Getting the lengths worked out.


Venhills yo the rescue, excellent kit.


New and old



Selecting the right nipple from the kit





These cutters do a good job



Cut ends



I like these dressed to a slight dome on the wheel, you must lose all spring to have a chance of keeping the carbs in synch


Ground end, see the plastic liner, keep a pointy thing handy and poke it in the plastic hole when its hot after grinding



One of the nipples had some extra material that stopped it spinning in the slide





Filed it off



Checked the fit



Trial assembly

Washed the head down for a final clean of oil ways and stud holes.



Will continue with more head work at the shop.

Tested the valve seal by pouring a little fuel into each port, all good.

Last edited by gavin eisler; 08/26/14 3:37 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554338 - 07/22/14 8:23 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
Posts: 3,405
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argyll. scotland, uk
Trial fit of head , light torque, add oil to chamber at TDC, measure volume
To the plug hole was 40 cc, about 45 to 1/2 way ip the plug threads






New torque wrench set up, needs some sums



Trial fit of cable , better than before, 110 degree noodles would be better still







Shiny Toga mega


Ticht aboot the taps


I am pleased with the cables and the combustion chamber volume.

I did some sums, based on a swept volume of 362.7 cc bore 79mm stroke 74mm

CC vol Comp ratio
35 11.3 : 1
40 10.06 :1
45 9.06 : 1
50 8:1

My reading was around 45 , it was hard to judge exactly , I couldnt tilt the beast to put the plug at the top.
Still I reckon a manageable 9:1 ish is the recipe.

The head gasket will get its final anneal and the head will get torqued down once Ive worked out the fiddle factor for the torque wrench ( 300 mm handle to centre of drive) with the extension added ( 62 mm centre to centre).

The http://www.freeinfostuff.com/TorqueExtension/TorqueExtension.htm gives 24.8 for the 30 ftlb I want with this set up. 16.6 for 20. Will sneak up on it.

Last edited by gavin eisler; 07/22/14 8:33 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554362 - 07/23/14 12:32 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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robcurrie Online content
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Irene, South Africa
Gavin, if you turn your adapter 90 degrees to the torque wrench, you won't need to work out any fiddle factor.

I am enjoying this build, and I don't even have to get my hands dirty!

Rob C

#554392 - 07/23/14 7:28 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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argyll. scotland, uk
Thanks for the torque top Rob, I had heard this before, but I am sceptical, does this not mean that the torque is applied about a distance equal to the hypotenuse of a 90 triangle. The Hyp is longer than the T wrench so this ( I think ) would give a greater torque, or does the angle somehow compensate for that, convince me.
Cheers
GE


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554393 - 07/23/14 7:49 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Mar 2013
Posts: 291
robcurrie Online content
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Irene, South Africa
You are quite correct, if you set the angle such that the centre of the ring spanner is at the same distance from a reference on the handle of the torque wrench as the square drive is, you will be more precise, but what's a footpound or two between friends?

(Some wrenches have a fixed square drive and the only option is 90 degree).

The important thing is to get the all the bolts the same.

Rob C

#554395 - 07/23/14 8:13 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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argyll. scotland, uk
Ok Rob I will try this , the previous torque figures I used were 28 lbf all round, John is happy to use 30 lbf and has tested his fasteners in the ally barrel.
I do not wish to go past this. So I may try the angle method at the old 28 lbf figure and compare with the fiddle factor on a test rig.
Food for thought.
GE


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554516 - 07/23/14 8:02 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
Posts: 3,405
gavin eisler Online content
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argyll. scotland, uk
A little more time on the carbs , cables and inlet rubbers, of course one of the throttle cable nipples has pinged itself into oblivion, however there is a suitable spare in the kit that will shorten with a bit of filing.

I had bought light alloy bolts for the carb stubs but the heads were oversize compared to the originals and made the rubbers distort, the old ones go back on. I may turn down the alloy ones to fit but needs must.

These are grippy nyloc nuts , the bolt is tightened with the short head of an allen key till the nut just grips and the bolt will not turn, a light nip. Its a soft sandwich. This set up has been very reliable and I am sticking with it.





fuel pipes, in surprisingly OK nick, a bit stained but not cracked or stiff, I think one of the taps had a bad seal to the tank.



Its difficult to get those neat ends on with the banjo outlet angles, hence the wire , crude but effective. Theres no sign of fuel leaks at the wired ends, however the fancy crimps,.... juries out.



Checking the HT leads plays nice with the cables





Head gasket with tapped holes , I spent some time synchronising the fit of the bolts and now it needs to be annealed.
The alloy spacer makes up the shortfall in block height so the head steady fits.




Before and after rhubarb cleaner advert

I want to fit something that will help take the weight off the carb stubs , they cost a lot and ruin your day when they split, so something that makes these last longer, and looking better,( they look dismal when they droop), . Maybe a leather strap round each bell mouth and up over the frame loop, big dog collars , mmmm. Any ideas? anyone?



The carbs out on stubs cause issues, the air cleaner no longer lines up, hence the big plates that I made in 1981 with ally plate from the NCR . The air box outers were cut away when I got the bike and the carbs sat out on finned alloy blocks , no bell mouths , nothing.
Ive tried longer stacks , the sideways dalek type, but found the carb tuning changed a lot and never got it to run right ( I think a wee-er needle jet might have helped). The short bells are easy to live with. Ive dicked around with all sorts of fuel pipe runs and got back to this , which was what was fitted when I got it, there are some tight spots on the runs near the airbox but this is the least messed up looking. Moving the carbs any further back is not an option at he moment hence the thin insulator gasket between the flanges.




My soldering iron, solder , blowtorch and flux. The iron head is loose , need to fix that first.

.

Hoping to final assemble the head and stuff tomorrow.
Still waiting for carb parts, Burlens and SRM lost the post race. Venhills 1st, with Pro bolt and a random ebayer 2nd, SRM and Burlens tying for 3rd at the moment.






Last edited by gavin eisler; 07/23/14 8:27 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554714 - 07/24/14 8:40 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
Posts: 3,405
gavin eisler Online content
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argyll. scotland, uk
Results just in, Srm 4th , Burlens still to finish.

Fuel pipes

It was hot. the cycle speedo hit 36.5 ( 103.5 F) in its blister pack, 26.5 up the glen.



Stan of the dump, he is an old mate who helps out at the recycling bit pf the dump, I ditched the old battery and back tyre at the resyck and picked up a Singer sewing machine , hand crank stlyle with accessories box and book, plus 2 x 3/8 th drive ratchets , a 6 inch wood vise and so,e 1/4 drive sockets for eighteen quid.



Checking the new fuel lines , the neat ferrules only fit 6 mm pipe, my fittings are 8 mm so it was into the local parts shop ( Franks in Oban for new line and clips),



Annealed gasket, sealant O rings , and fasteners



Head torquing tools, the 3/8 th drive Teng is nice to use ( from the dump today) , but the ball lock is poor.




Degreasing the head mating surface with acetone before smearing some blue stuff on



Any minute now.


Fitting the studs to the gasket after applying sealant to the lower gasket face



Bolted down in stages from 10 lbf, 15, 20 , 25 , 30.
A lot of dancing round the bike.



Showing tilt of carb to clear fuel pipes and fuel cocks.
, runs fine like this .



The rest of the shots havent come out properly on import.
Got the inlet rocker spindle in and called it a day.

These last bits of the build have been late evening sessions when its cooler. Scotland is melting at the moment.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554777 - 07/25/14 9:06 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Apr 2005
Posts: 2,332
Mark Parker Offline
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Posts: 2,332
Bega NSW Australia
Now I'm wondering what comp my 883 might have, if the chamber is 45cc it would be 10.7 50cc - 9.83 might check it and see. Cables look nice Gavin.


mark
#554820 - 07/25/14 2:32 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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old mule Online content
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Chihuahuan Desert
thank you for the shed update, nice to see a well used and well loved BSA, I say.

#554837 - 07/25/14 4:33 pm Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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argyll. scotland, uk
Thanks for the comments.

Yeh Mark , anything would have been better than the old throttle arrangement, I have great hopes for the noodles.

I learned what settings not to use on the camera, some pics are missing.

Back wheel refitted with new sprocket.



Found this mouse damaged wire in the loom, the white , with yellow stripe, the single connector was not great either, Ive changed that. Thhe damage is only a small section, Ive isolated it and fitted heat shrink, the conductors and bullet crimp are sound.





The other side of the connector , untouched!



Got the head furniture in place.



Sorry the rocker details are missing, camera probs earlier.
Head assembled, valves set to 6 thou inlet , 8 thou exhaust per John Hill.


I wish I was about to reveal the all time best way to fit rocker spacers and spring "thackeray " washers. My best advise is stay calm, you will spend a lot of time knocking the spindle back and forth, I use brass drifts and the wee copper mallet, a couple of tips.

Fit the spindle slowly , belting it in is not on, fit the spring washers with the spring ends to the top so you can see whats going on. The last washer in the stack is the worst for me,
the rocker spindle is fully home when there are more than 4 threads showing past the nut
( no washer fitted, the Nut is a good fit for a 15 mm ring spanner , the other end is 12mm ( none of my BSF stuff fitted).

The inlet pushrods had to go in first they wouldnt play if an exhaust was in place.

Tool roll showing some handy stuff, the small LED spectacles light was very handy for push rod to follower location.

Left to right
Brass drift, 1/2 " and 3/16", assorted 3/8 th ratchets and copper mallet, spanners for BSF , 1/4 , 5/16 , 3/8th fasteners and fuel tap unions. 6 inch rule, control cable cutters, small screwdriver, 1/2" x 7/16 th AF ringer and spoke, 1/2" combe and allen key for 5/16 th fasteners, TDC gauge, feeler gauges , tweezers, the good britool short 1/2 x 7/16 ringer .Allen keys.



Still some waiting going on , No sign of Burlens stuff yet.

Jobs to do.
Front tyre, Pipes ( Old ones are going back on , shouldnt be too hard), Carbs AWS , cables ( soldering throttles too length and make nipple fit, wiring repair), , Charge and fit battery, check spark, will the 25 year old HT leads , 11 year old Boyer and Primordial Lucas 6 volt coils still work?.

Clean decks





Back to work for a set .

,



Last edited by gavin eisler; 07/25/14 5:02 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554929 - 07/26/14 12:59 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Apr 2005
Posts: 2,332
Mark Parker Offline
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Mark Parker  Offline
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Posts: 2,332
Bega NSW Australia
I just checked the compression ratio on the 883, tilted the motor so the left plug hole was up, used a syringe and measured about 40cc frown I did spend a lot of time filing the face of the cases to get them square to the crank and the valve to piston clearance was a bit small. Probably why it sounds so crisp. It had an issue with the R/H cyl. It was fine or seemed fine in summer but started to get smokey once winter hit, I'm guessing .002" clearance might not be enough when gassing it up when its coldish.


mark
#554936 - 07/26/14 1:55 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
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gavin eisler Online content
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argyll. scotland, uk
Interesting stuff Mark.

Just checked my e mails from Burlen.

"Dear, gavin eisler

The status for you order # 200006336 has been updated to
Being processed.

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Thank you for your recent order via our website. Unfortunately, some of the items on this order are not in stock as detailed below:

Part Number: RKC/559
Name: MK I Concentric 600/900 Series 4 Stroke Repair Kit
ETA: 6-7 weeks
Part Number: 928/06035HA
Name: Hard Anodised Forged Alloy Slide - Number 3.5 - Cutaway 900 Series
ETA: 6-7 weeks

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Thats not good service, lucky I kept the old stuff.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554938 - 07/26/14 2:19 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Aug 2001
Posts: 3,405
gavin eisler Online content
BritBike Forum member
gavin eisler  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 3,405
argyll. scotland, uk
Talking torquing.

I kind of rushed through the head fit.

Breaking it down a bit.

Thimgs you can do to help the head seal.

1 Flatten the head with a fly cutter, its hard to see in the pics but my head has grooves like a vinyl disc left from a skim in the milling machine with a fly cutter, this helps the gasket bite.
Only a handful of thous taken off , around 3.

2 Use the correct washers for the head fasteners, these spread the load better and help prevent distortion.

3 I retorqued my head the next day, first i marked the bolt and head with a sharpie, next I backed off each fastener an 1/8 of a turn, then retorqued and noted any change at the markings, all bar one returned to same, the one oddity went another 5 degrees or so.

4 Fit O rings at the oil drains, I fitted 3 mm thick O rings ,( 2mm gasket thickness), its not totally necessary but it should help.

5 A very light smear of gasket compound on each side of the gasket. ( Copper kote is good if you can get it.

5 Anneal the gasket, cherry red then a quick plunge helps shift the scale, do not worry about discolouration.


Valve settings. Correction.

My memory is bad, John recommends 4 thou inlet, 6 thou exhaust ( stock pushrods), will reset at retorque


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
#554962 - 07/26/14 7:37 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: May 2013
Posts: 4,533
Allan Gill Offline
Allan Gill  Offline



Joined: May 2013
Posts: 4,533
Rotherham - S. Yorkshire
Unless your running anything but a standard cam I wouldn't advise anything tighter than the stock setting, after trying tighter clearances on the 650, I found that all the tighter clearance did was improve the top end a little but kill off the bottom end power. Increasing the gap a couple of thou ( I found 10 inlet and exhaust to work best with a stock cam).

As for the o rings. I bought some NOS gaskets for the 650. They start off at 008" thicker than a newly made gasket - (048") I haven't yet measured once crushed. But most interestingly the oil drain hole drillings are much smaller than these repop ones and so far I haven't had any issues with the oil making past the gasket - not unlike the other gasket where I needed to use I rings.


beerchug
#554974 - 07/26/14 8:40 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: Apr 2005
Posts: 2,332
Mark Parker Offline
BritBike Forum member
Mark Parker  Offline
BritBike Forum member

Joined: Apr 2005
Posts: 2,332
Bega NSW Australia
Allan are you talking about tappet clearances with an alloy cyl? Because the cyl expands more with heat, opening them up. I'm using C/molly push rods that expand less and that combination requires zero clearance cold other wise the tappet digs holes in the lash caps. I would have thought an alloy cyl with std pushrods would also need some degree of less clearance.


mark
#554988 - 07/26/14 10:56 am Re: alloy barrels for 750 OIF 1971 [Re: gavin eisler]  
Joined: May 2013
Posts: 4,533
Allan Gill Offline
Allan Gill  Offline



Joined: May 2013
Posts: 4,533
Rotherham - S. Yorkshire
Ah my bad. I wasn't taking into account for the expansion.

I'm interested at how the figures Gavin stated came about, was a height measurement taken from a cold and another from one at full operating temperature?


beerchug
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