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Re: Robs engine rebuild help thread [Re: Andy Higham] #741370
07/10/18 8:38 am
07/10/18 8:38 am
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Just the pad.

Some more good news, I phoned proberbly the only classic bike shop in Norway this morning and asked if they had some cam followers...

As it happens, he had a sett on his shelf.

"Are they in good condition? " I ask

" Good condition? " he replied

"they are new, and been on my shelf since 1971"

Haha, I hope the old price tag is still on them laugh

Last edited by Manx; 07/10/18 8:54 am.

1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
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Re: Robs engine rebuild help thread [Re: Manx] #741371
07/10/18 8:42 am
07/10/18 8:42 am
Joined: Aug 2014
Posts: 1,657
OZ
Triless Online content
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Triless  Online Content
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OZ
Now, that's lucky !

Re: Robs engine rebuild help thread [Re: Manx] #741374
07/10/18 9:25 am
07/10/18 9:25 am
Joined: Aug 2001
Posts: 4,068
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Posts: 4,068
argyll. scotland, uk
Thats a rare one, could have done a load of damage, so lucky / unlucky.great that the shop has the bits, just a top end strip / rebuild, could have been a lot worse.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Robs engine rebuild help thread [Re: Manx] #741376
07/10/18 9:34 am
07/10/18 9:34 am
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Yeah, could have been horrible!

The bloke in the shop said its very rare (espesially on an A65) but its not the first time he has seen it.

I suppose that makes me "special"


Back to the carb.. I lowerd the needle and it runs great but is a little lean mid register. I take it the air screw affects the whole rev range? and I wonder if the brass screw (pilot jet) is adjustable, or should just be screwed all the way in?


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741378
07/10/18 9:47 am
07/10/18 9:47 am
Joined: Aug 2015
Posts: 1,240
Bolton Lancs UK
A
Andy Higham Offline
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Bolton Lancs UK
I wonder if they got overheated when re-grinding? The pads are silver soldered in place


BSA B31 500cc "Stargazer"
Greeves 200cc "Blue Meanie"
Greeves 350
Greeves 360 Challenger
Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc "Llareggub"
2003 Aprilia RSV Mille "Lo Stregone"
'35 OK Supreme
'36 OK Supreme
Re: Robs engine rebuild help thread [Re: Manx] #741391
07/10/18 12:17 pm
07/10/18 12:17 pm
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Could be.

Swapping them out with untouched ones should keep me trouble free for a while.


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741421
07/10/18 7:01 pm
07/10/18 7:01 pm
Joined: Aug 2001
Posts: 4,068
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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argyll. scotland, uk
"I take it the air screw affects the whole rev range? and I wonder if the brass screw (pilot jet) is adjustable, or should just be screwed all the way in?"

The air screw has most effect for the first quarter of throttle movement, its affect on the rest of the range is minimal, this is an important zone all the same and well worth fine tuning, as a general rule err to be on the rich side of the air screw mix, there will be a dead zone of about a 1/2 turn where the idle speed is at a max, leave it on the rich side of this dead zone. This must be done when fully warmed up or you will be way rich.

The pilot jet is fixed, screw all the way in, presumably this is a premier? older concs had the jet as a drilling in the body, very early types had the jet in the float bowl roof, the tapped hole is still in the casting but its for 2 strokes now.

After 1/8 -1/4 throttle the cutaway has most effect, after that needle position, then NJ, then MJ at full throttle.

Needle adjustment is free, however dropping the needle to leaner cant really be compensated with the idle mix, a richer cutaway might work, try a 1/2 size less, . If it spits back from initial throttle opening when coming off idle then its too lean on the cut away, if its further up the range then you are limited by the needle clip gaps, these can be shimmed with washers for fine tuning, pretty easy to play with ., this will allow 1/2 step adjustments if needed.
What is the carb size?

You are pretty much on your own here for base settings, my 750 is in similar tune to yours but has twin carbs, stock 30s.
I dont know what size carb you fitted, stock tbolt size was 28, if you are using something bigger, 30 or 32, then you are on your own for settings, its not a common set up.
My experience is that for the same size carb 100cc more air flow for any given revs means it runs better with smaller jets than the 650 settings, 20 smaller on MJ, 105 NJ, 3.5 slide. These wont work for you , this just to illustrate why counter intuitively bigger bore using stock carbs create a stronger signal on the jetting.
it might be best to start with stock Tbolt single carb settings, try a smaller MJ or two.

As the carb size goes up so will the jet sizes, as a general rule, all else being the same, lower air speed needs bigger holes to keep ratios correct.

As a sort of side note, there has been the odd thread over the years when folk have tried fitting 30 mm carbs to stock 650 Tbolt heads rather than 28s, these invariably turned out difficult to tune, if you are using a 32 then possibly you will have similar issues. if using a 30 I would start with Tbolt settings.



Last edited by gavin eisler; 07/10/18 7:15 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Robs engine rebuild help thread [Re: Manx] #741423
07/10/18 7:15 pm
07/10/18 7:15 pm
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
I`m on a 28mm premium.

Standard t-bolt jetting. It was running rich so I went down on the needle but now running weak.

My timing was all over place with the elecrtex world crap, so could have affected jetting.

Think I`ll pull the needle up again and do some plug chops in the throttle ranges to see how its doing and take it from there.


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741425
07/10/18 7:30 pm
07/10/18 7:30 pm
Joined: Aug 2001
Posts: 4,068
argyll. scotland, uk
gavin eisler Online content
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argyll. scotland, uk
Try a size or two smaller MJ , I kept going leaner till the revs would pick up as I rolled off from flat out, thats def too lean, went up two sized from there. A long straight on a hill flat out in 3rd is handy. i also use the choke control for the middrange, accelerating at part openings apply choke, if it slows then its not lean, if it picks up then it is.
Stock A65T was a 230 MJ, based on my experience with my 750 stock carbs i would try a 210, caveat your motor , ports / pipes are different to mine so YMMV, open pipes would change things right away. get the MJ right first , you may find the slightly richer needle setting is fine if the MJ is slightly reduced, have fun, i tried plug chops, old plugs are missleading, new plugs showed almost no colour on the porcelain at all all i could see change was the heating of the electrode and colour of carbon on the top rim. By the time you start worrying about wearing out the plug threads you should have it sorted, its not good to unscrew plugs from a roasting hot head, wears threads fast.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Robs engine rebuild help thread [Re: Manx] #741426
07/10/18 7:41 pm
07/10/18 7:41 pm
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Thanks. Yeah, I`m on a 230 main, 106 needle jet, 3.5 slide.


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741434
07/10/18 8:56 pm
07/10/18 8:56 pm
Joined: Aug 2001
Posts: 4,068
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Posts: 4,068
argyll. scotland, uk
Re the cam follower failure, a few pages back you had a mystery click as the engine was turned, maybe that was a sign?


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Robs engine rebuild help thread [Re: Manx] #741553
07/11/18 8:49 pm
07/11/18 8:49 pm
Joined: Feb 2014
Posts: 472
Cork Ireland
C
chaterlea25 Offline
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Posts: 472
Cork Ireland
Hi All,
Quote
Did the whole foot break off or did the stellite pad become detached?


I repaired a Commando some years ago that spat off a stellite pad on attempting to kickstart, again luckily it jammed the cam against the casing
preventing the engine from starting so no further damage done, it took quite a search to find one small chip of the stellite pad though!!

John

Re: Robs engine rebuild help thread [Re: gavin eisler] #741586
07/12/18 4:37 am
07/12/18 4:37 am
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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M
Joined: Sep 2016
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Norway
Originally Posted by gavin eisler
Re the cam follower failure, a few pages back you had a mystery click as the engine was turned, maybe that was a sign?


The "click" vanished when I lubed the middle timing cog


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741717
07/13/18 6:39 am
07/13/18 6:39 am
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
I managed to fit the new cam followers, jug and head last night and I can breath out a little.

I find fitting the central head bolt a little scarry and I wonder how many people have lost a washer or springs from the forward rocker arms down the barrels...

Should be up and running already on Saturday. smile


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #741721
07/13/18 7:38 am
07/13/18 7:38 am
Joined: Jan 2014
Posts: 3,977
Aus
N
NickL Offline
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Aus
Put the centre bolt and it's washer into the barrel before dropping it on.
Then stuff some rag down the tunnel before assembling the rocker gear.


Lamas are bigger than frogs.
No room for sanity here.
Re: Robs engine rebuild help thread [Re: Manx] #741736
07/13/18 10:11 am
07/13/18 10:11 am
Joined: Aug 2001
Posts: 4,068
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Posts: 4,068
argyll. scotland, uk
Magnet on a stick, head torch , bits of wire, lost my fear years ago, anything that falls in there is stopped by the cam followers.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: Robs engine rebuild help thread [Re: Manx] #741933
07/15/18 7:09 am
07/15/18 7:09 am
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Yeah! She's up and running again. Lovely. I hope it stays this way for a while 😁


1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
Re: Robs engine rebuild help thread [Re: Manx] #743262
07/26/18 8:13 pm
07/26/18 8:13 pm
Joined: Sep 2016
Posts: 207
Norway
M
Manx Offline OP
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Manx  Offline OP
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Norway
Ive already done 1000km on her, 600, just today.

She blued her pipes first run after I finaly got her toether again and wouldn`t idle. Runs like a champ and pulls like a train now.Ended up with 250 main, 19 pilot, bottom clip on the needle.

I also fit a Bob Newby belt drive clutch kit (works brilliant! )

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]


Last edited by Manx; 07/26/18 8:16 pm. Reason: pictures

1966 Rickman Metisse (a65)
1960 A10 golden flash
1960 lambretta li150
1942 Ariel W/ng
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