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if he is over revving and has changed weights, he needs heavier ones. if he hasn't changed the weight then something else is wrong. i think pop-vavlves are things you can put on your powervalves to visually see if they are moving.
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1999 Arctic Cat ZL 440
1994 SkiDoo Mach 1 583
1995 Honda CR 125R
1982 Camaro w/ 355
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