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View Full Version : what has to be done to fit a 400ex motor in a 300ex



MX wannabe
10-25-2005, 09:43 AM
i want to put a 400 ex motor in my 300ex i but i heard that i would have to cut the frame and i dont really want to do that. i know that i will need a longer swingarm for the power to not flip me over all the time... thanks

bwamos
10-26-2005, 02:52 PM
350x conversion will be much easier. Do some engine work with the extra cash and you'll be of to the races. ;)

MX wannabe
10-27-2005, 08:41 AM
what do you mean 350x conversion??? do you just mean do the mods to my motor to boost it to a 350?? like cam, piston, valves, exhaust, and bore or do you mean another motor?
thanks

400exrider707
10-27-2005, 09:41 AM
Originally posted by MX wannabe
what do you mean 350x conversion??? do you just mean do the mods to my motor to boost it to a 350?? like cam, piston, valves, exhaust, and bore or do you mean another motor?
thanks

He means swap in the motor from an ATC 350x. Much easier and a million people have already done it. You could pick a 350x engine up cheaper than a 400ex one as well.

MX wannabe
10-27-2005, 10:33 AM
ok thanks a lot guys

wilkin250r
10-27-2005, 11:14 AM
There is a company called Powroll that actually sells a conversion kit. A few spacers, a little grinding on the motor, NO FRAME MODIFICATIONS, and a custom exhaust, and you're on your way.

400exrider707
10-27-2005, 11:22 AM
Originally posted by wilkin250r
There is a company called Powroll that actually sells a conversion kit. A few spacers, a little grinding on the motor, NO FRAME MODIFICATIONS, and a custom exhaust, and you're on your way. is that for the 350x motor or the 400ex motor?

ZeroLogic
10-27-2005, 01:55 PM
350x

ltl666devil
10-27-2005, 02:22 PM
its very easy to do. heres what it looks like in a 250x.(the same as a 300ex)

wilkin250r
10-27-2005, 02:27 PM
Probably in the next few weeks, I'm going to be selling a 350X motor for anybody interested in doing this conversion.

I'm only looking to sell it to somebody knowledgable, however, because I'm not exactly sure what shape the internals are in.