BSA A7 A10 Pre Unit Models 67 336 Idler Timing Camshaft Pinion & Shafts 1940/50s

Specifications

AI says BSA part number 67-336 is the intermediate idler timing gear (or idler pinion) for pre-unit BSA twin motorcycles, specifically the BSA A7 and A10 models produced from the late 1940s through the early 1960s.Function and DetailsPurpose: Sits in the timing chest to transfer drive movement between the crankshaft pinion, camshaft gear, and magneto/oil pump drives.Application: Fits BSA A7 and A10 pre-unit twins (plunger and swinging arm frames).Parts Context: Often referenced alongside part 67-335 (the idler assembly with spindle/key) or stamped directly on the gear itself. Could be Triumph pre unit twin cross over as the source could be a pre unit T100 and other models. Please satisfy yourself before buying!

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