I just picked up a suzuki fa50 1983 that had been sitting for a long time. I got the carb cleaned out, and put back together. I got this baby running, but I cant manage to make it above 20 mph. When ever I give it full throttle it bogs down and wants to die till I let off the throttle. Runs perfectly fine at the first 3/4 of throttle and idles steady. Ive cleaned the spark plug and checked that the muffler wasnt clogged. Any Ideas? Im guessing it has something to do with the carb. Should I adjust the needle level? Float level? Thanks. Also while the moped is running and on its stand the back wheel spins is this normal?