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hi guys, so i got this all genuine thumpstar, incl (fake?) mikuni 22mm carb. starts really well, runs nice on choke but once getting warm ,it starts cutting out/sputtering. these symptoms can be counntered with a little more choke 1/3 to 1/2 choke. most likely i'm running lean but want your...

i have this engine with bend con rod but very low hours engine yx 150. i measure the kickstartshaft 16mm, does this make it 100% sure gen 3 engine? i'm looking into buying parts for this engine, maybe make it a 160cc with the longer 57mm cranck. cheers for the replies, Hannes.

hi, my gearbox is very hard to shift from 1st gear to netral/2nd gear. is it worth tearing the engine apart to try and find the problem (bent shift fork i presume)? how much work is involved?

i just got this bike, it rides well, until it gets hot, then it stalls and can't start it again. might be ignition related i think. first thought of valves not having enough clearance,those were good. it's got a 22mm carb (inlet rubber is only 21mm,will match this to 22mm) 97.5MJ and 15PJ...

hi guys, i just got hold of a fairly new engine that somehow broke a valve and so breaking the piston and con rod. i might be able to save the head but need a new cilinder and crank. the difference between the 150 and 160 is the stroke,correct? could i fit the longer stroke crank in the 150...