Got an 04 blaster off craiglist and it seemed to be running great only problem was it was reving to high turns out it was just the throttle cable was tangle the quad ran great for about a week then the piston blew. I bought a "cheap" top end kit from ebay that included a new jug and filter we put threw the engine together and it would bot rev out into the highs it would just bog and gurggle. what im trying to figure out is why, it was running fine before then all of a sudden the top end, jug, and filter was replaced and it wont rev out. I then went to the air mixture screw backed it out a couple turns and it wouldnt make a difference just repeat the same thing. Is it an air leak, it it the rings, the coil, the filter, or something else is going on help thank you