Aynonomoususer

Im having some issues when putting it into gear( High specifically ) It doesn't seem to go in all the way and makes like a grinding noise and won't engage. I have to take back out and try again. Seems to happen if the engine rpm's are revving. Wondering if anyone else has had this issue or similar, and what I can do about it. I only have 200 miles and 26 hours on the machine just doesn't seem right. thanks

I'm looking to get new tires for my bike. Im gonna keep the same stock size but want to go to a mud tire. Any suggestions to where I won't lose power of have to do any mods.