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Message: [QUOTE="nickyd, post: 873765, member: 56089"] I don't think its the jet needle clip position that is affecting your problem - the needle is connected to the slide and fits itself inside the main jet - the main jet isn't part of the circuit at idle and therefore the needle won't have an impact - as you turn the throttle the slide moves up and in doing so the needle moves up and out of the main jet - the taper on the end determines the amount of fuel that is drawn up into the barrel of the carb. All of this happens from 1/2 throttle and up. Go to Eric Gorr's site and read the 2 stroke tech article about jetting - it may make it a bit clearer (eric-gorr.com). Now lets go back to your problem...if I remember you correctly, we all convinced you that you needed a new top end to get the bike running...now that it is running, you are having some fine tuning issues....assuming you replaced the piston/rings/gaskets, etc the bike should run fine...some exceptions - if you are having problems with the idle you may have an air leak somewhere -- the reason I say this is the wandering idle issue and the fact that you are choking off the air screw to "force" the bike to run better...my first guess - bad ignition side crank seal. I'm not saying this is 100% - just a thought....tell me what the OLD piston looked like? simply worn out? or burned up somewhere (hole in the crown maybe? or a melted ring? Or the top melted into the ring?). If so, you've got an air leak that is letting extra air into the combustion chamber and thereby leaning the fuel/air mixture out...since fuel aids in cooling the cylinder this can cause overheating and a fried piston. I would pull the left cover to expose the flywheel - and with the bike running try to spray some carb cleaner right at the seal...if the idle jumps up, you know you've got it. if not check around for other leaks - between the carb and intake, the base of the cylinder, the head, etc in the same manner). Another possbility would be to start the bike up - get it warm and then ride it a bit....not too long just enough to get it warm and see if the idle catches....if so you may have excess piston to cylinder clearance and until the piston expands after warming up, your seal in the combustion chamber is not sufficient...also as I said before, check the reeds...keep in mind a 2 stroke works from changing pressures - so if you have a leak or bad seal somewhere its not going to run right....there are more things I can tell you but start with these. Good luck [/QUOTE]

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