For anyone who's wondering, according to http://www.vpracingfuels.com/main.html Team Yamaha motocross, including all 2 and 4 stroke racing bikes, are running VP MR1. You can look under Racing Features for the info. It is very expensive, about $80-85 for a 5 gallon can. Just thought I'd pass along the info. I posted about it in another topic on the 250F side. The Yamaha of Troy 250Fs are running it as well.