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I just put in a HMF pipe and header with a Dyno Jet kit on my Raptor. It ran well after the install before I opened up the lid with 6 Uni breathers. I was testing the plug color and it cuts out at high RPMs the 1st three gears ( no room to test 4th and 5th). I checked the pulg and it was white so I closed off the Uni Breathers and tested it again. Same thing, cutting out at high RPMs and a white plug. I put a 150 Dyno jet in the right carb and a 148 in the left and tested again. It still cuts out at high RPMs but the plug is the right color (grayish brown).

Question.... am I hitting the rev limiter now or do I have a jetting problem? Any help would be welcomed.

Thanks,
Jeff

 

Arky,
I have the HMF on my DS. When I first put it on my DS was cutting out too. It was my rev limiter. Granted the DS has a very conservative rev limiter though. I'm not saying that's what yours is, but I thought I had a jet problem, turns out it wasn't though. It confused me for awhile, till I finally figured out it was just reving faster.