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Old 03-22-2009, 07:09 AM   #1
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Default 4 Cycling-2 Stroke

When 4 cycling occurs in a 2-stroke nitro engine, how should you systematically determine what is causing the problem?

I had this happen yesterday, and we eventually corrected the problem, but several of us had trouble determining what to adjust.

It would occur when we came off of full throttle. I thought it was the low speed needle, the others thought that it was the high speed setting.

Any help would be appreciated.
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Old 03-22-2009, 07:32 AM   #2
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4-stroking is caused by a too-rich setting dumping more fuel into the engine than it can burn so it sputters. Try leaning the main (high speed) needle.
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Old 03-22-2009, 03:04 PM   #3
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+1, adjust the main needle first, then you may also need to make a small adjustment to the low speed needle next then the idle position last.
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Old 03-23-2009, 07:14 PM   #4
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Thanks for the info.
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