jd450mx
05-01-2012, 07:57 PM
I am having some issues diagnosing my problem and am wanting some insight. The quad was running fine and all of a suddenit started popping really bad through the intake when you give it throttle and it wouldn't rev up. I did a leak down test and the intake valves were leaking. So I checked them and they were cupped a little so I replaced them. I also replaced the rings since I had the top end apart. It is still doing the same thing but it is not popping as bad now. I have checked the carb and it is clean and getting plenty of fuel. I also had to clean the stator and flywheel because it had alot of rust on it. I am thinking it might be the cdi box but I don't know of any way to check it. What do you guys think it could be. Thanks.