I have been able to run close to a half gallom of fuel through engine and so far no issues. The motor runs beautifly! Not a super power house but pulls the aircraft well. The model weighs probably 25 pounds plus and will pull the model vertical for awhile and the hold. I am running a 24x10 zoar wood 2 blade on it. I have a lot of nice compliments on the motor. I look forward to putting it on my scale project.