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Old 10-12-2009 | 09:56 PM
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nitro wing
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From: surrey, BC, CANADA
Default RE: Rich or lean

ORIGINAL: HIGHSTRUT

I have a O.S 90, 4 stroke mounted inverted. When I throttle back from a manuever the engine backfires. Is the low end rich or lean??
O.S. F plug.
Mine did the same thing, when using heavy APC props, I adjusted the valves and it stopped.
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