I have an '05 raptor 660 purchased a year ago that my girl rides. Over the winter i had a yamaha dealer install a gytr jet kit, cdi box. I also installed a k&n filter, and d&g exahaust all around the same time.
Now it seems that when i hit around 5 grand the rev limiter kicks in??? sounds like it? The box does not have and adjustible rev limit.
It has great power up until it starts cutting out. I pulled the spark plug, looks normal, replaced it anyways. Filter is clean. Don't know where to go from here!!!!!! It didn't do this before the "upgrades".
ANY IDEAS ?????