You need to retune your engine, you probablly have the needle settigns all messed up. Here read this [link=http://www.redcatracing.com/tuningyourengine.asp]http://www.redcatracing.com/tuningyourengine.asp[/link] and this [link=http://www.redcatracing.com/quickstart.pdf]http://www.redcatracing.com/quickstart.pdf[/link] and let us know how it goes.