yfz 450 jetting?
#1
#5
yfz 450 jetting?
Hey, I too am/was having jetting problems with my yfz450 I got a full exhaust, k&n w/ prodesign adaptor and a yz450f exhaust cam. I bought the dynojet jet kit, as it had more of a full range of jets, where as the gytr didnt have much of a range at all. Thus far, I have yet to get the thing totally dialed in. the bottem and mid range are awesome, but about 9,000rpm it stuters, falls on its face, then clears up, just in time to hit the rev limiter at 10,750rpm. Any help in my scenario would be greatly appreciated.
#6
yfz 450 jetting?
................it sounds like in my mind that I am running rich on the main jet, so what I did was back it down a couple of sizes, which as a result made my lowend run extremely lean (spark plug went white) and the topend was still doing what it was doing before (fallling on it's face, and stutering) .............weird. Dont know what to do. I have messed with the needle as well, bringing it up and down a notch. DIDNT HELP. ????
#7
Trending Topics
#9
#10
yfz 450 jetting?
boom, if it's cutting out on top, go richer on your main jet. Sounds like the low is fine with your needle and pilot adjustments, but the main controls 1/2 and up on throttle...go a little richer, sounds like it's lacking fuel on top revs! Bart, I won't IM you on this one, but there is no way I'm fast enough until I can beat Nate, next year will tell the story!! I finally got my suspension tuned in and it's a whole new machine now, I'm not even gonna worry about aftermarket shocks for a while...these will do!