I would like to post all my recent troubles with my YFZ in case anyone out there has one. First, the motor seized due to lack of oil to the crank and rod while up on the back wheels for too long. I had the rod replaced and had the oil mod done. I then put the bike back together and foolishly didn't follow the re torque instruction exactly as some of the steps seemed unecessary, a buddy said he always just tightened the head bolts really tight in an X pattern. Well, i can tell you the head gasket will blow or you will pull air into your cooling system causing overheat everytime. Most mechanics will focus on the cooling system and then check the jug and head for warp and everything else while all along its just improper torqueing of the head bolts. I got the bike running great again but has about 2 weeks of head scratching first.
Mokan Riders Offroad Club