Author Topic: Dynamo chain & final drive chain  (Read 1330 times)

Offline Guy Wilson

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Dynamo chain & final drive chain
« on: 15.05. 2012 17:42 »
Can anyone tell me if the dynamo chain is a standard size? Its part no. 67-296 . I?m wondering if I can buy a section of the shelf in Kenya. If I start talking about a 1954 BSA, its going to complicate the issue. 
Along the same lines, what?s the standard length and size of the drive chain part no. 42-9033? Its a swinging arm model and standard as far as I can tell.
Guy

Offline duTch

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Re: Dynamo chain & final drive chain
« Reply #1 on: 15.05. 2012 19:08 »
Hiya Guy in Kenya, It's what I've always done,note the part # but may as well disregard,as no meaning to a chain shop? Best thing is take the chain and sprockets to the chain shop,count the number of rollers in each chain for lengths, but keep in mind a previous owner may have taken one out for a 'quick fix'. If you have manual it'll be there but I think the final drive is 5/8pitch x 3/8 wide,not sure on S/A primary,maybe 1/2p. x 3/8w? I could be thinking' of something else but have a funny feeling dynamo is metric ????  (8mm x ?) or 5/16 x 1/4(?), others can confirm/challenge? Work to do now, hope that's helpful, duTch
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline Goldy

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Re: Dynamo chain & final drive chain
« Reply #2 on: 15.05. 2012 19:49 »
according to this site      http://britbike.com/    the dynamo is 8m x48r and final drive is 5/8" x 3/8" x100 - 102.   all the best Goldy
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Offline Guy Wilson

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Re: Dynamo chain & final drive chain
« Reply #3 on: 15.05. 2012 19:56 »
Thank you! that I can do on the phone, assuming they're working that is...
Guy

Offline duTch

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Re: Dynamo chain & final drive chain
« Reply #4 on: 15.05. 2012 23:43 »
Thanks Goldy,
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Online bikerjohndavies

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Re: Dynamo chain & final drive chain
« Reply #5 on: 16.05. 2012 14:37 »
Hi Guy, The Draganfly site lists all the different chain sizes and number of links for the primary and drive chain.

http://www.draganfly.co.uk/shop/pi1694906175.htm?categoryId=764

The dynamo chain is endless 8 X 3MM with a length that is 48 links for the upto 1950 long stroke A7 and 52 limks for the A10 and later short stroke A7 engines.
1937 Panther M100 Rigid, 1946 Ariel Square 4, 1952 Norton Model 7, 1953 BSA A10SF (WIP), 1954 Ariel VH, 1961 Triumph T120R

Offline trevinoz

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Re: Dynamo chain & final drive chain
« Reply #6 on: 16.05. 2012 22:24 »
Bikerjohn,
                     I think that you will find that the early engine has the long chain due to the larger dynamo sprocket.

  Trev.

Online bikerjohndavies

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Re: Dynamo chain & final drive chain
« Reply #7 on: 17.05. 2012 09:06 »
Hi Trev, not on my 1949 A7. The longer 52 link chain ment that the dynamo chain could not be tightend as the sprocket hit the inner timing case. The shorter chain 29-2199 (48) links is listed in my 1949 parts book.
1937 Panther M100 Rigid, 1946 Ariel Square 4, 1952 Norton Model 7, 1953 BSA A10SF (WIP), 1954 Ariel VH, 1961 Triumph T120R

Offline trevinoz

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Re: Dynamo chain & final drive chain
« Reply #8 on: 17.05. 2012 22:05 »
It depends on which dynamo is fitted, Bikerjohn.

If the long E3L is fitted, it should have an 11 tooth sprocket and the short E3H should have a 13 tooth.

Trev.