you haven't even started to get thru the run-in for that motor - run it easy & wait for the rings to seat
if it seems slow & low on power to get up hills, you can try making the needle one notch leaner
There will be a lot of opposing views on this. Many of us do not adhere to the 'take it easy' approach to break-in.Inside of your carburetor. Look up on youtube how to take an NT carb apart if you are lost.
But back to your engine, you said that you had maybe 25 miles on the motor or the carb? If its the carb never mind, but break your motor in slowly. Seriously, if you rush breaking it in (about two gas tanks of usage) you'll regret it. Just cruise around for now, don't push it past half throttle for a while or ride for more than 30 mins at a time.
Shaggz,Update so after i figured out how i was getting to much gas i finally got it to high rev lo and behold the rear mount bolt broke off in the case..... so im going to tap it out and i go to town to find replacement thread all i can find is some long bolts XD crap so i bought a bunch of stainless steel bolts and now i get to spend tomorrow cutting off bolt heads with a dremel LKJAFSJHOIDVJOPIENACJAWIU!!!!!!!!!! >XDDDDDDDD