Was told it was too lean in the video, so I put the biggest jet they make for it in it and still this. I dropped one half the size in and itll rev up but only to 4500
Idles ok here in the video. But give it gas and she dies. This was the big main jet
Is this a newer gx390? If it has the new digital CDI it incorporates a rev limiter. If it is the fix is to use a clone coil which does not have a rev limiter
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