Monkeys will pull a couple more hp once we have adjusted a couple of external things. Fontyyy's RVF made a good 65hp but didnt hold the power as long if i recall.
Like fontyyy says though its how useable the RVF's are which is their ace. My F3 makes over 60 for just about 2000rpm which I think is about as fat as you are going to get an NSR250.
A 400 with the same mods as a NSR250 will be pretty bloody close over a given distance. It really comes down to who has it in him to want to win.
I want to win alot, thats why I fall off alot.
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If I have to take the carbs off once more...