Needle valve setting?

by Shaw Lundrigan
(Nova Scotia Canada)

What should be a good needle valve setting starting out, before fine tuning? I cant quite remember. The motor is a GP .33 I think...

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Needle valve setting?

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Oct 07, 2008
 Needle valve setting
by: Pete

Depending on how broken in the engine is, I would start at about 2 1/2 turns out from being fully wound in (closed).
Unscrewing the needle valve more will make the mixture richer, screwing it in will lean out the mixture.

The 'pinch test' is a good way of checking the needle valve setting; with the engine running at high throttle quickly pinch the fuel line to the carb and note what happens to the engine RPM. Only pinch it for a second.

If the engine dies, or stutters badly, then the mixture is too lean and vice versa.

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