done it... twice. I cannot find anyplace where it is leaking or find any dirt (I cleaned it when I was rebuilding the engine also).

I've tried spraying the carb and all the surrounding hoses with a water hose, directly, on high pressure, with the engine idling-- no burps or anything from the engine. [img]i/expressions/face-icon-small-confused.gif[/img]

 

How about the float level, if its not set right and the quad is at an angle (like in a mud hole)then it might cause it to run lean. Just some suggestions.