Yamaha FZR400, basically stock. Turn key ... press button ... VROOM ... go out on the track ... come back in ... switch it off. Repeat as desired. Change the tires every few weekends and change the oil every few weekends. Doesn't have enough power to chew up tires or brake pads. Suspension is pretty much either set it and forget it (rear shock) or non-adjustable (front), just ride the darn thing. Works for me. (If you want something newer and somewhat faster, the SV650 is pretty much like this, too.)
Even in the vintage classes such as VRRA P4F3 where there is no distinction between two-stroke and four-stroke, the RZ350's have pretty much disappeared. Every time one shows up, I can pretty much count on at least one weekend per season where that bike won't be competitive because it either won't start or is running crappy for whatever reason. The more modded the RZ is, the more likely it is to break down (actually, the same is true of any bike, but the two-strokes seem more finicky about it). The built ones are fast when they work, but it seems to be a fine art to make them work and be fast and stay together.
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