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Primary chain to short
#817608 07/27/20 8:12 am
Joined: Jun 2013
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PEH Offline OP
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Im trying to fit the clutch to an A65, The primary chain is to short to allow the whole assembly to to go onto there relative shafts, I have an 80 link Reynolds chain, 58t clutch and a 28t drive sprocket, no adjuster fitted as yet, I have built several A65's and Triumph's and have not come across this problem before. I have heard that Reynolds chain is not what it was, anyone else come across this problem?

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Re: Primary chain to short
PEH #817610 07/27/20 8:54 am
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I havent had this problem, but have read here about unit singles having similar issues.
I suggest washing the factory lube off the chain with your solvent of choice, try again, it may win you enough to allow fitting, if that doesnt work ,I dunno, last time I fitted a new chain it went on with no probs.
Your numbers are all good.


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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Re: Primary chain to short
PEH #817612 07/27/20 9:14 am
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The Renold chain I fitted had a lot of stretch in a short space of time, send it back and get another brand. I believe the DID ones are good.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Primary chain to short
PEH #817615 07/27/20 10:07 am
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I have managed to get it on chaps. By building the clutch one piece at a time, i have usually managed to get them on with the clutch built up, (except the plates). i now seem to have an alignment problem, the drive sprocket teeth are 1/8 of an inch in front of the clutch basket teeth, Is there an alternative width drive sprocket?

Re: Primary chain to short
PEH #817618 07/27/20 11:47 am
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Had the same problem. Had a machinist take a tenth of an inch of the sprocket.


1966 BSA Lightning
(2) 1967 Triumph "Choppa"s
1974 Indian ME125
1960 Harley Servi-Car
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Re: Primary chain to short
PEH #817622 07/27/20 12:08 pm
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Originally Posted by PEH
I have managed to get it on chaps. By building the clutch one piece at a time, i have usually managed to get them on with the clutch built up, (except the plates). i now seem to have an alignment problem, the drive sprocket teeth are 1/8 of an inch in front of the clutch basket teeth, Is there an alternative width drive sprocket?


Hornets or ET models are different but not for the reason your wanting. The best solution would be to machine 0.125" off the oil seal sleeve. Its more common that the drive sprocket needs shimming to bring the alignment correct with the clutch but possible some that some aftermarket parts are not made correctly. You would also have been best assembling the clutch basket to the main shaft and the drive sprocket to the crank, tighten the nuts so everything sits flush and use a straight edge agains the outer row of teeth to find the true offset.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

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Re: Primary chain to short
PEH #817623 07/27/20 12:28 pm
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Are you sure the engine sprocket is on the right way round?


71 Devimead, John Hill, John Holmes A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
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Re: Primary chain to short
PEH #817629 07/27/20 1:08 pm
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Are you sure you haven't tried to fit a Triumph clutch basket in stead of a BSA one? There's about 1/8" difference in the position of the teeth, otherwise they are the same..

[Linked Image from i.postimg.cc]
The BSA one is Dished
[Linked Image from i.postimg.cc]
The Triumph T140 is flat

Last edited by Servodyne; 07/27/20 1:37 pm.

1957 BSA A10 Spitfire
1971 BSA A65 Firebird
1971 BSA A70 Lightning
1975 Norton Commando
1961 Norton 99
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Re: Primary chain to short
PEH #817643 07/27/20 3:18 pm
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I do have a recessed clutch basket. Just for clarification which way round should the drive sprocket be? the offset is 1/4 of an inch longer on one side.

Re: Primary chain to short
PEH #817647 07/27/20 3:29 pm
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Isn’t there a spacer / distance piece Used on the crank? I may be confusing engines........


Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
1 '65 XLCH, Hernia Gift, on the way to Japan!
Re: Primary chain to short
PEH #817649 07/27/20 3:39 pm
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Ground spacer first, which goes into the oil seal, then a shim as required, then the sprocket with the offset facing outwards.


1957 BSA A10 Spitfire
1971 BSA A65 Firebird
1971 BSA A70 Lightning
1975 Norton Commando
1961 Norton 99
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Re: Primary chain to short
PEH #817655 07/27/20 4:31 pm
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Another simple Pilot error, i could have sworn the longer offset went to the ground spacer but it seems not, onwards and upwards! Thank you for all the input chaps.

Re: Primary chain to short
gavin eisler #817656 07/27/20 4:34 pm
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You were correct Gavin.

Re: Primary chain to short
PEH #817727 07/28/20 3:05 am
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By the way, how were you trying to put the chain on? You are supposed to have the clutch hub on the mainshaft then take the engine sprocket and chainwheel with the chain around both and slip the engine sprocket on the crank whilst slipping the chainwheel over the hub. Then add in all the rollers to the hub.


Moderated by  Allan G, Jon W. Whitley 

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