Images within this listing may be for reference only. Please see description specifics for details. What's Included & Specifications.50mm aluminum cylinder head with oversized valves. 69mm valve length w/ corresponding rocker assembly. Optional EGR Blockoff plate and hardware. Long Life Ball Bearings (2). #85, #90, #95 Main Jets also included. 49/17 Performance Final Drive Gears (pre-pressed). 2.88:1 Final Drive Gear Ratio (usually 3.41-3.71 stock).
Angled Teeth to Reduce Noise. Aluminum Cylinder with Steel Cylinder Walls. 50mm Airsal Aluminum Piston (83cc) - High Compression, High Performance. 50mm Piston Rings (high quality).13mm Wrist Pin & Retaining Rings. All of the required gaskets to install this kit. Are you looking for the engine rebuild kit that is also going to give you a dramatic speed and acceleration boost? This kit is exactly what you are looking for. The STG Performance 50mm Big Bore Kit with Big Valve Head works as a direct replacement for most Chinese and Taiwanese 4-Stroke 139QMB and GY6 engines.
The big valve head provides the extra airflow needed to an even more powerful engine than just a 50mm big bore kit. When paired with the 20mm carburetor, we can now get enough air and fuel mixture to supply the cylinder properly. The A9 camshaft provide the valve duration, timing, and opening needed to finely tune the previous two additions. The 50mm Airsal Piston is used to raise the engine's compression ratio and build more power.The final addition of the 49/17 gear set helps keep your engine running longer by lowering the stress levels of daily driving and lengthening your final drive gear ratio to keep you running right in the powerband of this engine. These kits are designed for 50cc to 100cc engines. What separates these big bore kits from all the other kits you see online? These are the same components that Scooters To Go has been using on their racing engines for years, and they are the only parts that Scooters To Go trusts when building a performance machine. They are more reliable than the other kits available, and they are an all inclusive kit for an engine top end replacement in circumstances where customers choose to use an existing cylinder head. What can customer's expect out of this setup? With this setup, customers can expect to see a dramatic increase in throttle response, acceleration, and top speed.
When tuned properly, these kits are easily capable of speeds between 50 MPH and 55 MPH. Many customers have claimed speeds over 60mph with this kit, but your results may differ depending on numerous factors to include tire size, rider weight, bike weight, weather conditions, and elevation. How long do these kits last? If customer's change their oil regularly with the STG recommended oil, they can expect between 10,000 km and 15,000 km out of these parts.
Scooters To Go has been using these performance parts for years in their racing engines, and they are the only parts they trust. In picture above: rocker arm assembly is no included, only shown for reference. Don't forget to follow us on Facebook. We sometimes offer special prices on parts and accessories, only available to Facebook fans.The item "Scooter 100cc Big Bore Kit-Big Valve Head- Performance Piston, Carb, Cam, Gears" is in sale since Friday, January 22, 2021. This item is in the category "eBay Motors\Parts & Accessories\Scooter Parts\Other Scooter Parts". The seller is "scooters_to_go" and is located in Jenison, Michigan.
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