Britton Carter 0 Posted July 14, 2017 Hey guys, I just bought a 98 fourtrax that had an engine noise that was loud. I've had one of these quads before and it wasn't loud at all. The noise is coming from the engine, but I can't locate where. Ive replaced the timing chain, tensioner is working properly, replaced the top end, adjusted the valves properly, rebuilt the carb, lapped the valves, replaced the valve seats, checked the cam with a micrometer, but I haven't fixed the noise. The noise stays constant through all gears and all acceleration, nothing makes it worse or better. I've spent lots and lots of hours trying to fix this problem and have hit a dead end. Any suggestions or ideas to try would be greatly appreciated. Thanks!!!!!!!! Share this post Link to post Share on other sites Like what you are reading? Please help us by sharing this content.