okay, I am looking at buying a 98 yz400f, the main reason is it has a CA plate and the price is decent. The story of the bike is that it is owned by a man who has a shop, however my best friend who is the head mechanic of the local KTM dealer is not a big fan of their work. Anyway, the owner states that he just redid the top end including adjusting the valves. The bike starts easy, however the jetting is off as the first 1/4 of the throttle just dies, you need more than 1/4 throttle to go, this does not bother me as I would get a JD jetting kit. The problem is that there is a major ticking sound as if the valvetrain is off, had he not stated that he had just done the valves I would gues they were out of spec. At this point I am leaning twords worn cam chain? Ideas please?