Sooner or later, you will find yourself realising that your 50cc moped lacks the true power it deserves. Whether it's that you can't get to 40mph on the roads, or you find acceleration lacking in the city, you will need to boost your moped's engine a bit to get it faster. Luckily, the average moped user will find this activity to be both fun and productive. With a little courage and some upgraded parts, you can increase your 50cc moped's power to increase top speed and acceleration.
Remove the air box cover, which is located right in front of your moped's carburettor. It is a plastic box that restricts the amount of air that the engine receives. If this is removed, much more air will be allowed into the engine, resulting in a power boost.
Take apart the carburettor, and replace the fuel jet. The carburettor is held in place by screws. Take these out, and take apart your carburettor, remembering where all of the parts go together. Once it is stripped down, locate the golden screw in the middle of the carburettor. This gold screw is the jet, and it controls the fuel rate that the engine gets. Replace this with a larger jet.
Replace the spark plug. If your moped has over 1,000 miles on it, replacing your spark plug will give your bike an acceleration boost. The spark plug is located right next to the carburettor, usually on the engine.
Stick a screwdriver into your muffler's opening in the end. Engine gunk often gets stuck in the muffler, so move the screwdriver tip around in the muffler, removing any debris in the inside of the muffler. The next time your moped is started, the dislodged dirt will be shot out of the muffler.
Perform a general tune-up of your moped. This includes changing the oil, filling antifreeze (if needed), and checking your tire pressure. If any of the above are not in like-new condition, this will drastically affect your performance.