While we're on the subject anyone care to share the formula to figure top speed. We have a local track with a 3200' straight and last time I was there I could pull 16/40 to 12500rpm just before a handfull of brembos and three clicks of the gearbox. I'm a 180#ish rider on a 265#ish bike with 70ish HP and a MC21 gearbox in a MC28. As long as there are no long straights though 15/42 is my choice More fun!!!
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1995 A kit TZ 250
1994 Rothmans NSR 300sp SOLD
1998 RM 250 freestyle/motorcross
1998 Meathanol burning CR 500 AF super retard/motorcross/sand dunes/play bike