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Nitro engine tuning

Nitro engine tuning

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Old 06-14-2006, 06:22 AM
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Default Nitro engine tuning

I've lost the factory literature for an OS .12, so can someone tell me what the initial setting should be for the metering and needle valves and how to get the adjustments in the ball park for performance.
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Old 06-14-2006, 06:27 AM
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O.S. Engine Product Manuals can be found here:
http://www.osengines.com/manuals/index.html
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Old 06-24-2006, 10:07 PM
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Depends which OS.12...OS-Speed Fact. tuned TZ.12 factory settings are needling (slow speed valve) screw in/out until the head of the screw is alligned with the casing. The idling adjustment valve is the same. The needle vale should be 1.75 turns turned out from the fully closed position. Those are the regular settings.

My terminology for the different valves may be a little odd as my manual is in Japanese, but the TZ engines should all be the same...

Best of luck!
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