I currently have my old bike with a "Nonrepairable Vehicle Certificate"

If I rebuild this thing, is it possible for me to get the CHP or whatever inspections and get a salvage or rebuilt title to put it back on the street?

Or can I only do that if I had a Salvage certificate?

If California is anything like here, Non-Repairable means exactly that. If it was repairable I assume you'd have
something like our "Repairable Write-Off" Certificate. Given that It's got a certificate of any sort I also assume that you've
got insurance money from it rather than taking it home and just quietly fixing it. There's usually a good reason
for a non-repairable status eg bent frame, cracked head-stem Etc. Given those type of good reasons it wouldn't be
a safe prospect for either you or somebody else to be riding it at high speed. If you feel game however you can turn
it into a track day weapon and test your immortality.

I actually got that certificate for it because the insurance didn't pay me anything at all, and i initially didn't want to try and rebuild it as I'd need to buy almost every part again for it. But I do think it can't be satreetable again.

Not sure if I want to rebuild it as a trackbike, or just sell the parts I have left.

Yr Fooked... You can no longer register it.

Sell the parts to help finance the BMW.