the Suzuki ltz 400 the Kawasaki kfx 400 and the artic cat drz 400 are all the exact same bike with different plastic and Suzuki makes all of them and there not bad bikes but if you have it ported and the head re designed by ken occoner it would really open it up and make it a lot fasterI hear suzukis are something to stay away from. Looks like that narrows it down to what I wanted in the first place, kfx.
Leak test it before you start to pull it apart, it can help diagnose underlying problems!
Leak test first. If not around carb or exhaust I then suspect my head. Correct?