After you the head kit is installed, a full circle stroker crank will make your bike a 52cc. This mod is best suited to an engine with a head kit and to get maximum boost the crank must be balanced to your piston. You will need a good and experienced bike shop to do this for you. The crank will cost something between $110 and $130, plus whatever the bike shops charge. Once you have the full circle stroker crank installed you will never want to ride a bike with a half circle crank.

For even more power, you will want to allow more fuel into your engine and faster. It is time to upgrade to a four petal dual reed cage. With 2 dual reed sections allowing for 4 reeds, this gives you improved fuel flow and power throughout low, mid and top end. You will not be disappointed and this mod can be had for approximately $120 to $200.

With a headkit and a good carb, your next step up is a handmade Italian race exhaust—the Zocchi CAG Race Pipe. For anywhere from $160 to $200 you will feel the difference in the power increase from low, mid and top end.

You are going to need a bike shop with whom you trust and who understands the vision you have for the future of your pocket bike experience. With proper porting and tuning, you can get the modifications to work in perfect harmony with your engine. With all some lesser remaining mods and a timing key, you can easily add about 15mph to what stock pocket bikes could do out of the box.

Most pocket bikes come stock with CAG card that is only 12.88mm. By upgrading to a larger carb etc. 14/14 or WT-603 which are the most popular choices in carbs when it comes to racing you increase your engines performance all round by allowing more fuel and air to get burnt and this will increase your low, mid and top end power. A new carb will run you about $90-$160, but the improvement in performance is totally worth it.

A Fatboy Exhaust and Tank is an awesome exhaust system upgrade over the stock exhaust. It is popular among pocket bike racers around the world and many race winners swear by it. It’s a very cheap upgrade and will really open up your engine, the Fatboy Exhaust is that big, it comes with a smaller fuel tank so the pipe can fit. Expect to shell out at least $90-$160 for this mod.

For light people, a 2 shoe clutch is a modification must have. For about $40 to $70 you will instantly feel the difference from a 3 shoe clutch with springs, the only down side to this modification is you must adjust the springs perfect for when the clutch engages.

High Performance Piston Rings offer more compression and are a good cheap investment, as little as $10 to$20 will give a small increase in power.

A lightened piston is a lot better than the stock piston and is of much better quality. For $30 to $50 you will get a small increase in power.

One of the most important mods that can be done is getting a cylinder ported to your engine. A cylinder with boost ports, larger exhaust ports and the correct squish set, will give an insane power increase, Very good for the money at around $80 to $90.

These mods are for the more experienced racer that can handle a lot more power over stock, these parts will be best installed by a shop rather than risk doing it yourself. You will be amazed at the power increase to your pocket bike with these mods.

Probably the most effective per dollar upgrade you can get is a timing key. For about $20, a timing key can increase your pocket bikes engines timing by 10 degrees. Be aware that this will increase performance on some engines, but can also decrease performance in others depending on what the factory set timing is.

Replace your stock metal reed with a high performance Fiberglass one. Fiberglass reeds allow more and faster fuel into the carb, this resulting in a faster burning of fuel, which increases low, mid and top end power. A fiberglass reed will cost about $20-$30.

If your bike came with a black air cleaner instead of an air filter, its loosing potential power, by adding a high performance air filter and vstack, your allowing more and faster air into your engine, which will increase performance and engine life. Typically $30-$40.

One of the most important things that should be considered when buying modifications is your fuel filter. A Hi Flow Fuel Filter will run you about $7 to $15 and protects your engine from harm by dirt, plastic, and other debris. It is a must for every bike. Check your fuel line if it comes with a fuel filter, if not get one, otherwise dirt and other foreign objects will get inside your fuel and block your carb.

A good set of HP clutch springs will make your acceleration a lot better over stock and coming out of corners etc, you will have a lot more power for only $15 to $25. All CAGS come with 3 shoe clutches, the major let down with these clutches are the springs.

If you have general engine knowledge or instructions, these mods make for a very good starting point to modifying your pocket bike. When installing these mods, the flywheel, clutch, and carb must be removed first. If you have any doubts about whether you know what you’re doing, you could visit a pocket bike repair shop and they would gladly do the install for a small fare.