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Old 04-20-2009 | 05:41 PM
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crazy8s
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Default RE: OS 71 4S problem

ORIGINAL: mswify

Dears,
I bought a new OS 71 4 stroke to mount it on my Funtana s40, the engine was doing great and the plane was really fast, but suddenly after a couple of weeks (after breaking in) the engine started to lose power and now it barely flies the plane, i tried the high end needle but I couldn't get more power, I'm using cool power 5% fuel, please help me, I don't have enough experience with engines.
You should always check the valve clearances after breaking in a new 4 stroke engine. They CAN go out of spec.
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