Funny enough it would be easy enough to put a lightweight (RFS) 4stroke motor in your 300 EXC. But there is a major flaw in fitting a 300cc EXC motor into the frame KTM don't make a 300cc fourstroke motor. they do make a 250, 400, 450, 520, 525, 530 and there are variations on these capacities but nothing that relates to 300cc.
i'd be honest with you here to buy a motor is going to be expensive or your going to get a non runner then you need carb, electrics and exhaust system would it not be cheaper/easier to buy a fourstroke KTM.
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