Join Date: May 2004
Thanked 4 Times in 4 Posts
ATV: 2000 300 4x4
2000 cat 300 4x4 running very rough
Hey fellas. My cat has run like a top and this is the first fuel/engine problem I have had. It starts right up revs normal and I can rev it up then after the cold start process it starts to almost diesel I guess you could call it. It idles rough like it is lacking gas and you can not rev it, it seems that the piston is only moving up and down every second and making the whole thing shake. I was told it was in the float or jets. Put new main, pilot jet, and float needle valve in-checked adjustment on float and was right at .5 inch. Tore carb down and cleaned everything. The diaphragm looks good, but the slider has some makes in it from use and the jet needle has a mark in about the center of it where the top of the needle jet rubs when fully seated against the main jet. Fuel filter is new, gas changed, new plug, and airfilter. Oh yah the float and throttle cables work properly, the gas tank vent is good.
Still getting the same problem like it is starving for gas. I am going to try to adjust the vavles next and check the boots on each side of the carb for cracks.
Any help would be greatly appreciated.
Last edited by Grut; 08-29-2011 at 08:35 PM.