I had one on my KFX400. It was great, much better response, smooth increase of power, not the dump of fuel power like most large jets. Increase fuel milage, great for xc racing. Work great with exhuast and k&n power lid. Great Combo to add power. You still need to jet to allow more fuel into the bowl, but not as high around a 155 or 160 Jet, stock pilot. This fuel is sprayed into the carb, kind of like EFI.Thanks. I will definently check it out.[/b]