brother CBR-B-Que...
You can try to contact Honda over it, but I doubt they will do anything about it. It's too old and you have no proof.
1500 miles on an 01 motor is rather unrealistic in the general term of things, so they probably won't do anything.
I have seen motors pop before (yes, even from Honda) and when they do, most of the time Honda will stand by their product. (i.e., Scott Herbst popped his 03 CRF-450 on the ice last year and they gave him a new motor. CRF's are not sold with ANY warranty).
Your best bet would be to have the owner of a honda dealership contact Honda on your behalf. But again, there's no proof that you've never opened it up.