Hey i've just rebuild my top end with 66mm wiseco piston, put a new pro design cool head with 21 cc dome , i also have fmf fatty pipe and powercore silencer, no lid air filter , my jet are 310 right now its about 25-30 degree celsius out there at sea level, i also got 27.5 pilot jet but they were a bit longer than the stock one i remove from the bike , first of all there were no fire so after replacing coil ,stator and weld all the wire back to new its making fire now . Today i was ready to start it but it won't start, it does want to start but nothing happen and there is gaz on the spark plug after I kick a couple time so i dont know what to look for, it sound like he want to start but dies after a second , im pretty sure its a carb adjustement but any idea where should i start looking for? like i said earlier the pilot jet was a bit longer so do you think it could be that? btw i got these pilot jet from yamah dealer. else than that idk, i put the airscrew 1.5 turn like someone told me here on the forum and the needle clip is in the middle! w/e please help me if u got an idea! its driving me crazy now it'll be the end of summer and it will still not start lol!