I have a Shee that has been running like a scolded dog for years. All of a sudden last year it started to cut out on the top end after it is warm. I replaced the following parts to no avail, Coil, Stator, CDI, Rings, replaced the TORS, and I tried to re jet. It runs great when you first get on and ride but after about 20min. of hard riding it starts to cut out on the top end only. If you stop and let it cool for about 30min. it will start to run good again until it warms up. I am at the end of my rope and I need a little help to get back on the right track. I welcome any info that I can get. Thank you