Thread: dirt bike rebuild, are there any tell tail signs when its needed?

Savage never said if he's a racer, weekend warrior or a trail rider. It's possible to get good hours out of them, but it's certainly not the norm. The wr450 is a very understressed engine compared to the yz250f, you're not comparing apples with apples.
In case you're wondering, I've been in the motorcycle parts trade for nearly 20 years.
I'd have to agree with stumpy on almost every point he's raised.
to the OP, what's your intentions with the bike? That would help with giving you better info on rebuild intervals.