A fully Tyga'd nsr would be too light though... Mine at half weight, (I presume you mean with all fluids apart from petrol) tips the scales at 124.5Kg... That's weighed on digital vehicle scales with a .25kg tolerance. It's 136Kg fully wet and 119 dry.
But 78bhp would be easy with the 300 kit. Mines at 73 with no engine work.
Those bore strokes are going to get whupped!
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NSR300R - Why did i ever have a 250...