i had my ski do this my cause was the squish from head to piston was to tight causing a bad harmonic in the motor. It made my plugs do the same thing. so id try checking that also you dont want to be any less than .050 cause the rods stretching at high rpms and piston swell when its warm.
im not on here every day i sent you the tracking info and it should be there soon i told you when i was going to ship it out and have stayed in contact with you. no need for a negative post but what ever makes you feel better. i had alot of things to ship out and your the only one that had to...
760,factory b pipe mod chamber, ada head 33cc domes, 48mm blackjack carb, vforce reeds, xmetal trim, ac handle pole, 9/15 hooker prop, d cut ride plate.
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