crf 450r motor in 400ex frame

[WhiteBros400ex]

I wanted to know how hard it is to put a crf dirt bike motor in a 400ex frame.Is there alot of frame mods to do, if anyone readign this has a motor to sell i will trade you a 2002 blater for it.

Thanks Guys!!!!!!!!!:)

i wouldmt bother, save up and buy the arens frame and crf motor or keep what you have or go to a yfz or soemthing diff

[416exmx]

not quite as easy as you may think it is. but if you want TRUE POWER..... go CRF450.

[d-14 rider 27]

air boot gets to be a pain in the arse, other than that its not too difficult

[CowsBitePeople]

Im sure you can find alot of info on it if you do some searches:macho

[WhiteBros400ex]

how much is a arens frame and a crf450r motor i was trying to save money and just trade my blaster for a 450r motor and my and my friend who races and welds was going to help me.