The 426 is great. Its a little buzzy with stock gearing but will wheelie and slide on command. with a 40 in the back it great for faster roads. The only problem is its loud as hell. I have a WR exhaust with the plug but it robs to much power.
I'm thinking of getting similiar tires as yours for the street and supermoto track and keep the pilot race for the big track.
Have you gone to Myle Standish state park. I use to race around there on my Duc. nice tight twisties. I haven't taken the SM there yet
00 426 supermoto