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Message: [QUOTE="brlatm, post: 1001485, member: 58461"] I have recently moved to about 5000' elevation and installed a fmf pipe silencer and changed the clutch springs and rear gearing on my sons pw50. I adjusted the idle screw and air intake but it seems to chopout at full throttle wide open on the test stand. I put a 67.5 main and open the airbox up with a different filter plus 1" air box filters. I am running Motul for the oil injection. He has a race coming up in 2 weeks any ideas to clear up the topend matter would be appreciated. [/QUOTE]