Gearbox

For gaskets click here; for tie bolts and adjusters click here; for clutch, and clutch operating parts click here; for clutch cables and adjusters click here.

Although the gearbox was made by Burman, the mainshaft was designed to mount the existing BSA ‘C’ group clutch. The gearbox model number was GB30 until 1955 engine number LA1265 when it changed to GB33 to denote the introduction of a few changes. The only significant one was to the method of clutch adjustment, which was now carried out at the kick starter end of the push rod instead of at the clutch pressure plate.

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