The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Frame => Topic started by: hdawson on 09.04. 2018 12:12
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Hi All.
What is the purpose of these attachments on my frame other than to impede my drive chain?
I would think that they should be topped with rubber or similar guides. They certainly seem to be worn in a way that
indicates much chain abrasion over the years.
After recently throwing a chain and finding it to be in appalling condition *red* I am in the process of purchasing a new one but am surprised by the lack of room after trying to fit a modern Regina z ring (530) which I have subsequently reserved for my modern Triumph.
Any tips?
Cheers, Hadrian.
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Do you mean the chainguard mounts on the swinging arm?
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With half decent sprockets and chain there should be a good clearance between the top of these mounts.
I think that the top of the front mount has the least clearance.
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G'day Hadrian.
As said, chainguard brackets. If chain is adjusted correctly it won't rub.
530 X ring is what I run on the rHonda firebreather, much too heavy and power robbing for the BSA. 530 is the correct size and I only run o ring chains if dirt riding is expected.
Cheers
edit: corrected mistake.
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Thanks for the feedback guys.
I thought that 530 is a bit excessive.
Do I need to change my sprockets to accept a 520?
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Doh, double doh. 530 (5/8 x 3/8) is the correct size. I'd forgotten I converted mine to 520 twenty odd years ago.
Sorry mate. Std on HD quality chain will more than handle the massive power our bikes put out.
Cheers
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Cheers Musky,
A friend of mine also had his sprockets modified to fit a 520 chain.
What is the advantage of doing this?
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Not a lot really. A slightly lighter chain. Nortons used 520s for a long time then switched to 530s with their 650 twins. With Nortons, there's not much clearance behind the primary chaincase which is why some revert to 520s. A 530 gives a wider roller so in theory slightly slower to wear out.