I got this blaster in pieces... it came with a new crank with bearings and piston with rings .... so I built the motor and got it running... motor has 150lb compression... I just rebuilt the carb with all new hard parts... sleeve, needle, mixture needle, high speed needle, and etc... The quad starts up and I can get it to idle off the handle adjustment, there's no idle screw... But it smokes like crazy and it revs up to a certain point like let's say idle is 1500rpm, highest rev is 5000rpm... no backfires no sputter just tons of smoke... Now if I start the quad and shut the peacock off and let it idle for a couple seconds and begin to rev it up and I revs perfectly until, the bowl empties out... so I figured obviously its the Carb, but with all new parts in the Carb it still does it.... any suggestions??