66cc Raw runs flat at high RPMs

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Donkeyboy

New Member
Sep 17, 2011
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Park City, KS
Only mod is a sbc aftermarket air box. It runs good at low and mid range rpms,
but it runs flat at around 5500-6000 RPM. It does open up and wind out like a 2 stroke is supposed to. I am using a stock plug and 91 octane gas with synthetic 2 stroke oil mixed at 32:1 It has about 200 miles so I am assuming its pretty much broken in... Any suggestions? I'm going to get an NGK plug
tomorrow, but don't think that alone will solve it. Any advise would be GRATEFULLY appreciated!!!!!