In the end it all ends up as the same thing though, increased volumes of fuel = increased cylinder pressure. Put this into the fuel, pipe and big bore kit and you have a very big bang indeed!!!
Perhaps lowering cylinder compression ratios and customising pipes is the safest way to run big bore kits on the NSR's. Then coming to the 250 standard bore engines, reducing jet sizes a bit for hi-flow filters and pipes? I dont mean smaller than stock, but certainly smaller than 160 etc!
With regard to JHA and HRC jet kits, they have done the homework. But you need to be using every single other part the make eg. pipes, HRC carb tray, CDI's and so on.
I know big jets is safer from a temperature point of view, BUT, if you add too much fuel you are weaking the oil concentration. This said you could in turn increase the overall temperature due to further friction instead of burn temperature.
Just a thought, I could be talking crap!
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NSR250R MC21 (NEARLY SOLD!!)
VFR400R NC30 (SOLD)
Santa, please bring me a NSR500 and a SP-2 next year. Pleeeeease....