make your 50cc scooter EVEN MORE FASTER
In this article I will offer more in depth tips and tricks to heavily modifying your 50cc Chinese made 4-stroke scooter for OFF ROAD use. I say off road use because most state laws require a motorcycle endorsement on the riders license if the vehicle is over 50cc as well as the scooter may have to be registered with the BMV. Modifications to the scooters engine size, intake and CVT will be explained. Installing a 72cc upgrade kit from good and reputable online company is a fast and easy way to achieve upwards of 50 mph top speed out of your scooter. Forums such as Scootdawg have a wealth of information concerning troubleshooting, links to trusted online parts suppliers and even a step by step guide step by step guide on install your new big bore upgrade kit.
Instructions
1. There are many big bore upgrade kits on the market for your Chinese made scooter with the 139QMB Honda clone engine. In this article I will specifically talk about the 72cc displacement upgrade kits due to unreliability factors associated with going larger than 72cc. While there are many different manufacturers for these kits, the Taiwanese made kits offer the best quality and workmanship. Always find a kit that includes a cylinder head with larger valves to take more advantage of your added performance potential.
2. When upgrading the bore of the engine, you must be able to supply enough fuel to the engine. You do this by changing the main jet in the carburetor to a larger #85 main jet. This will allow for a more balanced air to fuel ratio and ensure maximum performance. Running the engine too lean can seriously damage your engine, overheating it. Running the engine too rich (too much fuel in the mixture) can cause poor fuel economy and wear on the internal engine parts faster as well. Some people have reported good results changing the low speed pilot jet to a larger #38 if your are having acceleration or stumbling issues.
3. Remove the factory air intake box and install a free flow UNI type cone filter. This will allow for your engine to breath better. After market exhaust pipes are also a good way to increase power but often at the expense of a louder scooter.
4. Change out the old stock spark plug for a NGK iridium spark plug. There are high output ignition coils and Race CDI electronic ignitions however I have not seen many substantial gains from other consumers that have bought these.
5. Use synthetic motor oil after the break in process for a little added performance. Always check your tires for proper pressure, check your brakes and make sure your wheels are turning freely.
6. Some of the best performance gains you can obtain from your scooter is changing out the Roller weights from your CVT Variator (drive pulley connected to the engine crankshaft) If you want fast off the line acceleration then lighter weights such as 5.5 gram would be recommended. If higher top speed is your goal, 7-8.5 gram rollers would be the best. Of course what roller weights sizes are best for you can depend on many factors such as rider weight, terrain, etc, so I would suggest getting 2-3 different sets to find your "sweet spot"
7. Forums such as Scootdawg.com has some of the best resources I have seen with experienced riders and guru's that knows what works and what doesn't. One of the largest contributors to the site, Enviromoto, has a good website and has some of the best customer service I have seen out of ANY online store Period. What I like about Enviromoto's products is that he offers different levels of performance packages with everything you need, Instructions included! All the guess work is taken out!
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