I originally started this post in the WR400 forum, as this is what I was told the bike was when it was given to me. The bike did not run when I got it so I started with diagnosing the issue by checking compression, spark, and fuel. Bike has plenty of compression and is getting spark. I rebuilt the carb but still couldn't get the bike to fire. After countless hours of research I decided to reopen the carb and replace all the jets. During the jet replacement I had a mismatched pilot jet. I started to think the bike was a different year so I looked at the vin number. According to the vin number the bike is actually a 99' YZ400F, I also checked the engine vin and it too is from a YZF. During the diagnostics I checked the timing and the exhaust cam was rotated one tooth clockwise, I didn't think much of it because I saw that the wr400 could be set to this timing to gain some extra power. Now with this being said obviously the exhaust cam is actually out of timing instead of being set up for yz timing on a wr. Does this sound right? and could this be preventing the bike from cranking? Thanks!
Edited by hattackk, December 24, 2014 - 12:50 AM.