Posted February 09, 2003 - 03:25 PM
I am running 48 pilot,stock needle and clip position,160 main and air screw 1 3/4's out. Thanks
Posted February 09, 2003 - 03:35 PM
Posted February 09, 2003 - 05:22 PM
I'm having the same probs. Last bike was cr125 and I could open throttle and vary/time the hit with the clutch. My 450 will often bog and i have to back out and slowly open throttle, already having my timing blown for the jump or hill. Unfortunately I'm a four stroke newby too so I have no remedy. Sounds like you've made some jetting changes and I hope they helped. I can't even find the plug on this bike let alone jet it. I may just take it to local dealer to have it jetted. Gearhead buddies of mine say it sounds, smells and looks(glowing header) rich, but everyone on the site says they come lean. I don't feel like I'm going fast on this bike but obviously I am (pulling my buddies like never before). We need to do some tuning but adapting to the 4-strokes idiosyncrasies will take time. Hope you're enjoying your bike as much as I am. Later.
Posted February 09, 2003 - 05:23 PM
Try raising the needle (lowering the clip) one notch and see if that improves things. Since the YZ motor is essentially the same (provided you open the air box and uncork the exhaust) you might also consider purchasing a YZ 450 needle.
Hope this helps.
Posted February 09, 2003 - 05:26 PM
Posted February 09, 2003 - 06:05 PM
Posted February 10, 2003 - 12:27 PM
you can make the pipe glow with a #50 PJ and you can stop it glowing with a #35 PJ. depends what else you do. the needles are the only bit that is lean.
Posted February 10, 2003 - 03:30 PM
Posted February 10, 2003 - 04:57 PM
Changing the needle taper (like WR vs. YZ) might be the most significant twelve dollar mod you can make to a four stroke.