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Discussion Starter · #1 · (Edited)
Im thinking of possibly making a sleeper. Would a 450r engine fit on my 2005 400ex frame? What other mods would I have to make?
 

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You will have to make new motor mounts and a radiator mount at the minimum... Just put a 440 kit on the 400.
 

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You should find an XR650R motor to put into it. BIG bore power.
 

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The XR400 motor would be an upgrade
 

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Discussion Starter · #5 ·
Thats the other thing. Ive read on here the 426 kit is better than the 440. The 426 is less likely to blow up and this and that. Which do you prefer?
 

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me myself i prefer the 426 kit it workes great on my friends quad no problems at all
 

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Discussion Starter · #8 ·
Right now I have a stage one hot cam in it, piped, jetted, and AMR Cdi Rev Box. I have plans of putting a stage two cam in it with a 450r carb on it. How would that be for motor upgrades?
 

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I vote XR650 motor... Is this a voting thing???
 

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CBR1000RR!! JK


i think build the 400 to the max..


just a quick side question..would a 400ex motor work on a 300ex frame?
 
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