OH! Forgot-- my AHRMA interest lie in my effort to get my 450 on the track. I spent a substantial sum buying stuff all winter only to find out the new rules forbid most of it. They now require stock exhaust (which, talking to Tim Lile-- chief rules dude-- they will change in 2009 because of the cost of OE exhaust parts). But, OE or OE replacement engine internals means, no fancy hi comp pistons, valves or guides (unless you cheat-- you gotta be pretty desperate, in my opinion to cheat in Historic production NOVICE-- I'll wait til I move up to Sportsman!!
You must run OE side covers which means, no A/M air filter pods (that I can see fitting in there). Stock tank, stock seat, fenders, carbs, and stock rims. Doesn't leave much room for any meaningful mods at all!. Even if you did "cheat" and build the crap out of the motor, your going to be restricted with stock exhaust and carbs! We'll see. They want it to be inexpensive, entry level racing. So, I applaud them.
Make everything right and tight, safety wire, catch pan, clubmans, shim the front fork springs, change the fork oil, slap on a set of shocks and tires-- boom, you're racing!
I am going to sand blast the frame (you can only remove the side and center stand lugs), and have the gussets welded. Replace front and rear wheel bearings (thinking of using ceramic bearings), steering head bearing, and bronse swing arm bushings (thank you Bill!). The engine will get new crank (ceramic) bearings, rod bearings, cam chain and tensioner, maybe a hone with rings and a valve job.