I have a Nissan 6hp 4 stroke. It has been dissappointing as well. I've also had it back to the dealer several times and have talked to a factory rep a bunch too. Mine doesnt idle well. Idle stop is set and either it runs too fast or dies, pick one. I dont even know if you can adjust the low speed jet? It also hesitates greatly when you hit the gas? Anyone else? I have it on a grumman sport boat and I get "slipping" at high speed, played around with all different pitch props Nissan supplies, to no avail. Really scratching my head over this one. Might have to do with the boat but the hesitation still sucks.