i need to know the part number or name of a part is the part that clamps over the cam and the vavle cover bolts down to .....

 

This might have what you are looking for. http://houseofmotorcycles.bike...pt_name~MOJAVE+250.asp

If not, then go here http://www.bikebandit.com/part...&model_dept_id=1298559 and click on the parts you want to see on the right. I find this site useful when looking for OEM parts.

 

I like that. Gonna use the snot out of it too!

 

well i tryed that and it dont have a part number for the part i need

 

That's because its a dealer-only part. What you want are the camshaft caps, a machined and mated part to the cylinder head.
If all you did is strip the threads for the valve cover bolt, the hole can be drilled and a helicoil insert put in to repair. Don't do this if you haven't done this before: if you drill too deep you'll ruin the part. Let someone knowledgeable do it for you.