if in an air leak from the carb mix some water with a little soap and spray the outside of the carb and it will bubble up and that where ur leak is or it might be the throttle cable move the cable up and down if the idle changes thats ur problem
you could have all the power you want but with no control of the bike you could get beat by a stock blaster on the track. got to have control to have power in my opinion.
when i got mine it was in more crapy than that one doest look bad for 500 bucks just a new top end and u should be ready to go and i would put a oil block off kit on it too
If you buy the 2000 blaster a top end is going to run u about 175 bucks (piston and boring). I would go with the 2000 blaster if he is not askin a lot for it. i wound`nt want a 125 motor in a blaster thats my opinion tho