I worry about that. My chain got caught a few days ago heading to lunch, locked the rear. Thought for sure I was going down, but managed to save it, rewrap the chain with my pocket screwdriver. I won't be WOT going over RR tracks...ever...again....
The minarelli shifter bike has been switched back to direct drive. The shift had been swapped on to the bike with the ape hangers. I've had the minarelli out there but it's not really geared for that track. However I am just waiting on some parts to make my yellow stage 6 minarelli track ready with a new gear and adjustable ignition. I mainly use the black bike at the track. It's a heavily ported China girl, jog exhaust, 21mm phbg carb with 11/56 gearing.
Tops out around 65kmh but accelerates a scared cat.