Try to adjust your high speed needle 1/8th of a clockwise (turn it out) to richen it up until it runs properly IOW it does not splutter at top speeds if it does then just go back a 1/8th turn, then you need to start adjusting your low speed needle to get the low end correct. lastly you have to adjust your idling and then recheck every thing, also a lot of smoke = to rich, little or no smoke = to lean, just a thin trailing smoke is all you should have
Easiest, let the engine warm up, try and run a few circles and let it idle, it should idle evenly for a solid 1 minute, if the idling goes up it is to lean and vice versa. that you nrrd to adjust with your high speed needle
There are also a lot of You tube videos on how to tune correctly, but I am almost sure you are running to lean
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Try to adjust your high speed needle 1/8th of a clockwise (turn it out) to richen it up until it runs properly IOW it does not splutter at top speeds if it does then just go back a 1/8th turn, then you need to start adjusting your low speed needle to get the low end correct. lastly you have to adjust your idling and then recheck every thing, also a lot of smoke = to rich, little or no smoke = to lean, just a thin trailing smoke is all you should have
Easiest, let the engine warm up, try and run a few circles and let it idle, it should idle evenly for a solid 1 minute, if the idling goes up it is to lean and vice versa. that you nrrd to adjust with your high speed needle
There are also a lot of You tube videos on how to tune correctly, but I am almost sure you are running to lean
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Also, which percentage fuel are you using, you should use 20% although 25% will be fine as well
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Check out this vid, its a good one Nitro RC Engine Tuning Guide and Diagnostics_ By Squirrel.
I do not have the actual link