250-500cc 2012 Squeaky rear wheel bearings/breaks

So I purchased a brand new WR250 from a reputable dealer in Western PA. Their claim to fame is that they do a 5 hour race prep on each bike prior to the sale.

Well I got the bike home, and basically left it in my garage while I followed the extensive break in period instructions. Somehow, the top engine mount bolt sheared off, and I didn't notice for day or so when I saw it on the ground. This was somewhat disconcerting since I never even torqued the motor other than revving to break it in.

Following that, I replaced the bolt with temporary one while waiting for the dealer to send the replacement. During that time, I took it out once off road (<1/2 hour max) and now I am hearing a terrible squeaking noise coming either from the floating rotor or the rear bearings.

Anyone have any ideas? I will eventually have to take it back to the dealer, but it's an hour trip and not easy to fit into my schedule.

Everything else seems fine, still a little hard to kick start as it's not broken in yet, I imagine it will get easier.

Thanks for any suggestions.

It's hard to "hear" things over the internet but I would assume it's just the Husky rotor rattle. Can you hear it when the bike is running but sitting still or only when moving?

that awsome rotor rattle will fail a 96db sound test.

If the rear brake is squealing you may have a small rock lodged in it.

The sound only happens when moving, and it hasn't seen anything but clean cut yard grass. I found a post on hear about a good place to get spec bolts and they should be here today. I'll see if the noise goes away after I put some time on it. Thanks for than help, can't wait to get this thing out.