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Im having some trouble with my 450. When i start it i have to pump it 4-5 times with the choke to get it to fire, it then stalls and i do it again and it usually stays running then. As it idles every once in a while it will pop and stumble a lil but stay running. If i ride around at slow speeds and it pops it almost wants to stall. The pop is comming through the carb. I have an hrc jet kit with 185 main and 50 pilot and 2.5 turns on the screw. I recently set the clearence on the intake valves .007 was as close as i could get to the .06 spec. What i am guessing is the valves and seats are in need of some attention. Im just looking for some educated guesses. The quad is an 05 450R with hrc cam,jets and airbox with a k&n. Thanks
 
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