Hi, I'm trying to fit a FCR37 to a DRZ400. The fit is completed and I'm trying to tune it. Recommended setup on different forum is #40 pilot #160 main and EMN needle 3rd clip. #40 was not enought, engine temperature rise quickly on idle and rev stay high after throttle bliping. Now pilot is #42 and 2 turn on pilot screw. During my tuning, I also try a 162 main and bike feel rich so I get down to 160 Needle clip was moved to 2nd to help with bog. Yesterday I made a test ride and the snap was ok and power too. The only thing is in last gear, near 8200RPM and WOT, the engine wont pull anymore. I red somewere it could be a indication of rich condition so I change the main jet to 158 and try it again. I warm the bike with a little run and put it WOT in last gear for few seconds (5-7), hit the kill switch and pull the clutch. I remove the plug and I have a light gray one side black on other one... I put a brand new one in the engine, riding few minutes trying to keep throttle between 1/4 to 3/4, hit the kill switch, pull the clutch and remove the plug. I only a deposit on one side of the plug and this side is gray...near the electrode. So I put back my needle to 3rd clip, still with #158 main and it run fine. Any advice??