My riding buddy has an 04 F7, and I have a 98 srx700 with a 1" track. Last year he was consistently a little quicker than me. This year I rebuilt my clutches and went with a set-up on turk's page (89a-10, b-w-b, dalton 53-43, green spring at 60, new bushings, belt, and rollers). I have no problem beating him this year, other than the first 100 feet (he hooks up a little better out of the hole). We were at radar runs this weekend (terrible conditions) and I ran 81 miles per hour in 600 feet. His best was 79. A lot of Apex and Nytros were in the high seventies low eighties. In any distance longer than 600 feet I would have beat him by a lot more. I keep my machine fairly clean (power valves every 600 miles, carbs spotless, track tension good, clutches and belt clean and adjusted) all these little maintenance items help. If I really want to become competitive in 600 feet I need to change my stock gearing and pick my track. Going to 23-39 gearing would probably really help to dominate my friend's f-7 since he has very little above 100 mph.