Retarded YZF Timing? Help!
Posted August 08, 2007 - 10:01 AM
Before I go moving things around I thought it best if I post photos here and ask for opinions.
The bike is a 2000 WR400. I believe it to be stock other than bolt on and free mods like pipe, airbox mod, throttle stop. There ARE tooling marks on the head bolts so for all I know there's a hi-comp piston in there.
The jetting seems fat to me with a 180 main but it runs fine with it. It likes to get hot at slower speeds- more so than other WRs I ride with. I believe retarded cam timing would explain both of those.
Ok.. on to the photos. What should I do from here?
Posted August 08, 2007 - 03:58 PM
From the photo of the cams I can tell you that the exhaust cam is a YZ cam by the tooth count from the top dot mark to the dot mark on the left. The timing chain pin count between the cams is correct for a YZ setup. The timing marks for the exhaust looks correct at 9:00 and the intake is correct at 3:00. It looks like everything is timed correctly.
Posted August 08, 2007 - 04:54 PM
What's this about it being a YZ cam? Where can I research this to verify it. (I was taught to question sources)
On the bright side I did a leak down test and she's good at 10-15%. Now if I could just figure out why there are tooling marks on the head bolts. Anyone know an easy way to tell what piston is in there?
Posted August 08, 2007 - 07:29 PM