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View Full Version : which motor fits



EXinMB
11-13-2010, 07:16 AM
i know ppl have put all kinds of motors in a 400ex frame but what is the easiest. I have thought about putting a 450 in it but i dont know what all has to be done to fit the motor properly. I also thought about putting an xr400 dirtbike motor in because im sick or having electric start and worrying about my battery running dead trying to crank over my 440 big bore kit. and also most parts for a ex fit an xr motor so i can keep alot of parts. so basically is an xr 400 motor pretty much a direct fit