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Discussion Starter · #1 ·
This is on a KX500, sorry, not the basic Shee or R, but its in a quad! HaHa. Everytime I run it past 3/4 throttle or so, and let off, the motor surges really bad, and wont go away until I put a load on the motor. Could this be an air leak or lean condition? The plug says its running rich. Very black on the porcilin, for only a few runs. Premix is 40:1. Stock motor, with 40mm Mikuni round slide carb.
 
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