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SC120FS won't run at high speed

by Pete
(Salisbury UK)

The engine has run at full speed but no longer will. Fuel hasn't changed (another 120 ran on it since).

Problem first manifest in a climb and now on the ground as well. Changed the clunk tube in the tank (suspect split but perished anyway) runs fine at low speed and up to half throttle.

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Cracked " o " rings .!
by: John Mantova

Cracked / perished o rings in carb would cause this

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