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Hey guys i just got a Yz250f and the guy i bought it from took it to a mechanic and he said that the valves need to be replaced at the next time of Adjustment, when do they need to be adjusted? also i ride every weekened and it also has race valves and high compression piston, if had it for a...

My mate is changing his valve springs in his 140cc YX engine so he will need to do the valve clearences , what is the valve clearences on a 140cc yx engine, Thanks

ohh, now i cant tune my 26mm oko caby, it starts but backfires the tiniest bit and cant idle for to long, then when it starts (after i keep restarting it and then it warms up) and i go for a ride it goes fine, as i let go of the throttle it starts to backfire like only once or twice, and it...

Hey people, I have a 140cc bigoot with a brand new 140cc yx engine, i put all the bits together (carby accellerator cables and stuff) and then kicked it and it ran fine, i took it for a ride and it was very good, Then a couple days later i rode it and it started backfiring and splattering, so i...