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So my latest find is a Moto 4 250. Looked in good shape, started right up but would backfire and die upon acceleration but you could get it to go if you were good with the throttle. I figured it was the carb. was a brand new Chinese carb, he didn't have original. I took it apart and cleaned it, only thing I found was some debris in main jet and the main adjustment on bottom was at 41 turns. Cleaned it out and set at 2 turns, re installed. Starts up, runs better actually drove it but seems really sluggish, once I hit 3rd gear could barely pull it. Rechecked everything, even ordered a new carb as I had this problem with another atv but still same problem. Now I pull it apart and decided to check compression, I show only 85 psi. I checked valve adjustment (after aligning up cam gear to mark on case). to make sure not too tight still right at 85 psi. I assume I need to pull the head and look at the valves, Any ideas I am missing something? motor does not smoke but is super sluggish. The specs I find are off the downloaded manual of a 94 but figure should be the same. It states compression standard is 128 and Minimum is 114 and Max is 142 Any other Ideas before I tear it down? Thanks in advance Az