it is a very helpful artical.....heres the link again...http://go-racing.vpweb.co.nz/Tech-Tips.html.......also make sure its not a clutch issue. sounds like you might need to lean the hsn a tad, not much, just a hour or so(1/8th of a turn). if that does not help you, let me know what motor you have. i must have missed it somewhere down the line.