From a dearth of NSR's in previous years they were the most popular model on the grid this season
In terms of tune you don't need a mega motor, reliability and handling are the most important. Aim is to finish, enjoy yourself and then win.
I know nobody believes me but the motor I ran at Anglesey was a totally stock KR-1 top end not even S, albeit on my tuned bottom end. That set up is reliable and showed it was fast enough to run at the front of the two strokes given the pace that weekend.
I have let the F250 slip over the last few years but will hopefully get it back up next season to somewhere it used to be. I have identified 9 possible KR's and am busy collecting names just so we have an idea of numbers.