Shouldn't show up my [lack of] ability lol--but had a "75 Mk8 Pursang new but in 1976 & it was in bits for something every other week, mostly gearbox by memory but came apart easy--undo screws then shake it. Had the crank apart too a few times & in the end the pin was too loose a fit to be safe, so not knowing what to do other than an expensive cure, i went around town with a micrometer & ended up using a volkswagen king pin [true], was a couple of thou bigger [or something]. Got the rod honed a bit for the rollers to fit good & carried on. Loved the Bully though, best failsafe airfilter & easy to service. Quiet exhaust, handled great & was quicker than i realised as had an MX250B 1975 which blasted off with a hiss & a roar but Bully was still on the shop floor in "76 so boss said use 'that' for a while--actualy fell in love with it. Useless brakes though--Chrome on aluminium. Funny thing is, thinking back & hope i'm not contradicting myself above but i took the Yam & the Bully out to our track in "75 & thought the Bully was slow but was a Yamy fan anyway so went with that again as changed every year. Sorry, getting off subject. Got a 36 Bing on my RT2 Yam off a Monty though lol.