My 00' WR stalls once per ride after it's been running for about an hour. It almost always occurs while the throttle is nearly pinned. It happened last going up a dune in 3rd gear pinned. It takes about 20 minutes to get running again. If I kill it after that it will start right up. Has anyone run into this problem before. I only took about 10 mm off the throttle stop and have the yzf cam timing. No baffle or airbox cover. Any suggestions would be greatly appreciated.