Just picked up a cheap quad that a guy had given up on. Has my mechanic buddy come over, it ran for a few seconds or minutes but was weak, then died.
Cleaned the carb, noticed it had little/no compression. (It had more in the beginning of the day.) Began to suspect valves, took those covers off and they seemed to function fine, (giant valves by the way)
Next came the timing chain. Taking the tensioner out, it ran/started a LOT better. It was real tight. Now with the tensioner adjusted properly, it will run a lot better, and you can drive it.
My mechanic however, seems to think it's missing a lot of power. I've never owned a utility quad or rode many quads so I cannot say for certain. Is this possibly that the timing chain it maybe one or 2 teeth off??
Thanks