69zandar
07-10-2010, 03:09 PM
OK guys any ideas? My 88 250r with a ct pro-x cylinder has started running horrible. I rode the quad one weekend and all was well, a month later we did a dune trip and as soon as i unloaded it from the trailer it started acting up. The quad starts fine , idles fine but as soon as i started to ride the quad it would stumble, miss at about half throttle and would not accelerate at all. I brought it back thinking maybe the plug went bad, swapped it and same problem. Got the quad home and cleaned carb, replaced cdi ( had a spare ) and fired it up again. Same thing. I pulled reeds just checking things and one petal isnt closed 100% (v force 3's). I started quad in garage without the air cleaner on and while quad was idling fuel was being blown out carb. but after 1/4 throttle it went away. I rebuilt entire engine 2 years ago and the thing has been flawless. Now im thinking there may be a vacuum leak, but i dont have a leakdown tester. Plug looks rich but that may be due to miss? I dont know. Thanks for any advice!!!