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Helping keep British Motorcycles on the road for over 30 years - established 1977

Crank Regrinding:

Bernie Nicholson, Canadian authority on British motorcycle mechanics, recommended having plain bearing type cranks reground by an automotive machine shop when wear on conrod journals is .004" or greater, or ovality is .003" or greater.

RH crankshaft main bushing journals, where applicable, should be reground when worn .002" or more, to avoid losing oil pressure, and fitted clearance should be .0015 to .002"

It is important that the machine shop be advised to retain original radius at the ends of the bearing surface as if ground out to a sharp corner, crank failure may result.

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