Scooter 100cc Big Bore Kit-Big Valve Head- Performance Piston, Carb, Cam, Gears

Description

STG Performance 50mm 83cc (100cc) Big Bore Kit with Big Valve Head,
20mm Carburetor, 49/17 Gears, A9 Camshaft, and 50mm Airsal Racing Piston
for
50cc to 100cc engines -
139QMB and GY6
***United States supplier. Shipping from Grand Rapids, Michigan. Ships via USPS Priority Mail. ***
***Most orders have same day shipping, and arrive within 2-3 business days!***
Images within this listing may be for reference only. Please see description specifics for details.
What's Included & Specifications
Cylinder Head
-50mm aluminum cylinder head with oversized valves
-69mm valve length w/ corresponding rocker assembly
-Optional EGR Blockoff plate and hardware
A9 Camshaft
-High Quality Steel Production
-Long Life Ball Bearings (2)
20mm Carburetor
- CVK style carburetor
- 20mm intake-side outlet
- 20mm butterfly valve
- 38mm filter-side inlet
- #82 Main Jet
- #34 Idle Jet
- #85, #90, #95 Main Jets also included
- Accelerator pump
- Automatic electric choke (2-wire)
- Unsealed and rebuildable
49/17 Performance Final Drive Gears (pre-pressed)
-2.88:1 Final Drive Gear Ratio (usually 3.41-3.71 stock)
-High Quality Steel Construction
-Angled Teeth to Reduce Noise
Cylinder
-50mm Diameter (83cc)
-Aluminum Cylinder with Steel Cylinder Walls
Airsal Piston & Rings
-50mm Airsal Aluminum Piston (83cc) - High Compression, High Performance
-50mm Piston Rings (high quality)
-13mm Wrist Pin & Retaining Rings
Gasket Set
-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.
Don't fall victim to some of the other kits sold online
, you may save a few dollars on your initial purchase, but soon after, parts will need to be replaced due to poor manufacturing and cheap product materials.
Scooters To Go
has been using these performance parts for years in their racing engines, and they are the only parts they trust.
Scooters To Go
trusts these 50mm cylinder and piston kits so much that they come with a
30-day (unlimited mile) warranty against product failure*
.
(In picture above: rocker arm assembly is no included, only shown for reference.)
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We sometimes offer special prices on parts and accessories, only available to Facebook fans.
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*30-day (unlimited mile) warranty does not cover product failures that result from improper customer installation, improper air/fuel ratio tuning, failures that result from other engine component failures, engines exceeding 8500 rpm's, improper oil servicing, or foreign object ingestion. If a customer experiences a product failure, the component must be shipped to Scooters To Go, at the customer's expense, for quality assurance and verification purposes.
If you have any questions, comments, or concerns about this product, our warranty information, or our returns policy, feel free to message us via eBay, reach us through Facebook, or call us @ 877-569-5691.