Hi,

Have you ever seen 12-15t final drive sprockets for Burman C gearbox?

18t-60t is to high..

Yes, crank sprocket -allready adjusted to 12t.

P

There is an option to make your own, if you have access to a lathe. Take the teeth off the old sprocket with an angle grinder (brutal, but case hardened teeth will kill any lathe tool), then true it in the lathe, buy a blank sprocket (cheap at any good bearing/transmission factors), bore the centre out, weld the two together. In theory it should then be case-hardened again, in practice mine never are, and my front and rear sprockets still seem to wear out together at the same time. If you're stuck, there a small engineering firm near me that does it, I could get a price for you (he doesn't charge me, because I do work for him in return), but if you haven't any lathe access there'll probably be a firm near you that would do the same, if you prepare the orginal sprocket first. I have a few photos of this process for a magazine article I did, I can forward them if that helps?

Hello Odgie,

Thanks for your answer.

Have thought of your solutions, but hoped for an option to buy.

Regards, Pat

There is an option to make your own, if you have access to a lathe. Take the teeth off the old sprocket with an angle grinder (brutal, but case hardened teeth will kill any lathe tool), then true it in the lathe, buy a blank sprocket (cheap at any good bearing/transmission factors), bore the centre out, weld the two together. In theory it should then be case-hardened again, in practice mine never are, and my front and rear sprockets still seem to wear out together at the same time. If you're stuck, there a small engineering firm near me that does it, I could get a price for you (he doesn't charge me, because I do work for him in return), but if you haven't any lathe access there'll probably be a firm near you that would do the same, if you prepare the orginal sprocket first. I have a few photos of this process for a magazine article I did, I can forward them if that helps?