I have a 1998 summit 670 X and it seems to have a miss or something around 4500-6000.I cant tell if it is loading or if something else is wrong,It you give it fuel when its missing it will shoot out of the hole like a bullet this makes me think its not fuel but I dont know enough about them to tell.It doesnt smell like its burning rich,Ive used high octane fuel and tried booster but it still does it. Also some times when you give it fuel itll pop like a miss but if you back off it goes away and runs fine untill you throttle up again.Also when it acts up if you back off the throttle just alittle itll smooth out and run fine untill you give it more then it comes back. Ive changed plugs,belts,fuel types, Ive checked for leaks,hoses off,vapor sensors,cleaned the vapor can and lines. It now occasionaly when stared will pop and hessitate like it is not running on all cylanders. Crap has anybody got any ideas of what I could check or do just shy of letting a shop tear into it?
[Edited by mountaingoat1 on 1/15/2008 at 6:58 AM]
[Edited by mountaingoat1 on 1/15/2008 at 7:00 AM]