Maintenance & Technical > KX500 Original

confused jetting

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bige:
the surging is only with CLOSED throttle going down hills it lerches back and forth. it runs fine upon throttle only at 1/4 throttle does it studder just like its to rich there. from 1/2 to full runs clean.

bige:
checked the piston for wash and there was none which tells me im way to lean, im going back to stock jetting ride it a while and check the wash heck might need to go richer on the main. seems like piston wash is a better indicator than plug reading

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