Yes... your motor needs oxygen and the more that flows easily into it the better. Take the aircleaner off and take a squirt around the block you should see the difference. (i dont condone doing this for lengthy periods) If you get a high flow aircleaner you will get a very slight increase in performance, your best also popping a tuned pipe on the motor to benefit from the increased flow rate
P.S Any cleaner off a pocket bike will fit too, tiz what we used on my big bros china motor under 10 bucks from the local pocketbike shop