Whats the major difference in putting a yzf crf or kxf 450 motor into a 400ex frame modified for a crf motor but id like to maybe do a kawi or suzuki cuz its hardly ever done?
in the newest dirtwheels, they put a kx450 engine in a yfz450 and said they only had to make new mounts...
i sese that i bet that thing is unreal it looks real nice too. are all new bike engines 4 speed like that one is?
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