The o3 EC400 and the 03 EC450 have the same stroke that being said the cranks are also the same, I do know that the stock bore of the 400 is 90mm and the 450 is 95mm that is all I've been able to find for differences between the two. I just ordered a big bore DRZ400 kit with high compression piston and hot cams, if the cams have to be modded I'll just put a DRZ head on the damn thing and call it good.
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