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Message: [QUOTE="LionelT88, post: 1472821, member: 144602"] I'm beginning to think it could be a gas or carb issue like you said! definitely not a leak or compression leak issue bike only had one ride on it brand new everything my second guess is the stock size cylinder I got used off of Ebay the sleeve that was in it had to ports on the exhaust side that lead to no where now there both the same size in the same location on each side of the sleeve about 3/8" inch square makes me wonder if it's not a sleeve for a newer KDX 200 one with a machical power valve??? This I'm not sure because I've never seen one! So I'm thinking that its getting blow by not allowing proper combustion and fuel is getting into the exhaust because man it seems like I mixed it double 24/1 ratio when I did not! I have an aftermarket carb I'm gonna try out mutch more advanced then the old makuni that's on it it has air screw I have smaller jets for it so i guess I'll play around and see till I'm able to send my other cylinder to be sleeved or buy one and do it myself i appreciate your input!! Anything else anyone can think of would be great especially someone familiar with KDX bikes [/QUOTE]