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Primary chain rubbing

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I've now noticed that the p/chain is rubbing against the inner c/case. It has a standard drive sprocket and clutch sprocket. The inner c/case is correctly butted up to its supports.I can't see on the exploded drawing of the gearbox any shims/spacers for the main axle. Any ideas? Cheers George

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George, there are three offsets for engine sprockets, though you don't say what year your bike is?

The Late George Cohen defied anyone to put a year to the offset, so that might not be a help.

The only breakdown I ever had on my 16H was in 1998 when the primary chain broke at the split link. Carefully tapping the inner chain case out just a fraction, where I could see it was rubbing gave just enough clearance. Don't let the chain wear or break before the inner case wears back.

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It's a '55, Neil. I may have to resort to tapping the chain-case out to give some minimal clearance. At the moment it has rubbed the paint here and there off so it's definitely touching.

 

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