I am an old school dirt rider who has been out of the game for a decade or so. I decided to begin riding again so I found a 98 YZF 400 locally that I purchased for 500.00. The guy was up front about issues with the bike which include, no idle, will not kickstart cold - must bump start, bogs out when throttle is dumped (accelerates fine when throttle is applied slowly). He is telling me that the center intake valve is bent and is causing these issues. Although I have been out of the game for awhile, its been my experience that when a valve is bent, the engine wont run at all. This bike runs well, VERY well actually minus the idle and starting issues (lots of power, awesome acceleration). How would any of this be possible with a bent valve? I havent had the time to break the engine down yet but I wanted to get a few opinions on here before I even begin down that road.