i know exactly what the problem here is. ther is only one way to repair a force... remove and replace! seriously, you should double check that pisser to make sure it not clogged. you also might wanna check the half moon key between impeller and shaft. if you installed it upside down it might work for a while then start slipping. not likely but possible. i know some people have run force engines with no probs. these are the lucky few. if you have one that gives you trouble, go ahead and invest in another engine or, at least, a good paddle.