Hello, I've had a my '96 KDX-200 for almost 2 years now and here's the specs. FMF torque pipe, Fredette port and polish, 155 main jet, 45 pilot & stock needle center position. I run Klotz pre-mix at 50-1 ratio. The bike runs well, AWESOME down low but I've noticed that it really smokes quite a bit at wide open throttle. I've done a ton of reading on THIS cool site and understand some of it, but I'm just too damn lazy to do loads of hit and miss tests with brand new plugs here and there. I was hoping someone could enlighten me. My guess would be either I need to lower my pre-mix to a 42-1 or lower mix, or maybe a smaller main jet. Thats MY guess, now lets hear it from the pro's!!!
Thanks in advance, Patrick...