Well I just happen to have a couple Ventures and also use the XP6102 I'll need a little more info in order to help though.. Type of engine, glow plug, and fuel used, good fuel/clunk lines, etc. Also, how well and long does the engine run until you start having problems? If your hovering fine at eye level for awhile and gradually lose power your running lean and overheating. There are ALOT of possibilities....but we'll get it figured out for ya!