Vintage Dirt Bike Q & A

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 Post subject: Chain length
PostPosted: Fri Jul 17, 2015 2:31 pm 
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Joined: Sun Jul 17, 2011 9:01 am
Posts: 14
On my 1974 CR250M I am running standard 14 teeth engine sprocket and 49 driven sprocket, and was wandering if anybody could give me some advice on the best chain length. I suppose it would be 108 or 110 links. Thanks in advance. Brgds Rolf


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 Post subject: Re: Chain length
PostPosted: Sat Jul 25, 2015 10:11 am 
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Joined: Mon Jul 13, 2015 2:45 pm
Posts: 7
Location: Austin, Texas
The Manual on page 48:
"
Drive Sprocket - Number of teeth 13 (standard 14)
Driven Sprocket - Number of teeth 45, 49 (standard 47)
Drive Chain 110 link - 110 link is supplied for use with optional sprocket combinations requiring greater chain length. "

I think that's you. :)
My completely stock bike had a 106 link. (14/47)

Let us know what brand you buy too. I'm in the market for a chain myself.

_________________
Austin, Texas
73 CR250M - in restoration
69 - Z50AK1


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 Post subject: Re: Chain length
PostPosted: Sun Aug 09, 2015 1:37 am 
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Joined: Sun Jul 17, 2011 9:01 am
Posts: 14
I know, but there is no way a 110 link chain will fit. I believe Honda counted on the customer cutting that chain to the appropriate length. I have a 14/49 sprocket set up and ended up with 108 link chain. It nearly bottoms out the chain tensioner even leaving a full slack. I think I should cut it to 107. 105 or 106 will also do fine if you want shorter wheelbase, I belive 104 will be too short. I bought a D.I.D chain. /r


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