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Bearing Sizes


boghopper350
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Somewhere around 1973 the gearbox mainshaft diameter changed where it sits in the clutch side bearing, therefore so too did the bearing size. Can't be any more specific than that though, sorry, no idea if there is a specific model number this occured from.

Crank bearings and seals are all the same size

Clutch hubs and baskets differ, as does the spacer the hub sits up against

Later gear selectors forks are thicker than early ones and won't fit early gears

Bultaco UK is your obvious source for this info

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