Scooter Stage 1 Performance - 139QMB & GY6 - 83cc 50mm Big Bore Kit, A9 Camshaft

Description

STG 83cc Stage 1 Performance Kit
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!***
83cc - STG Stage 1 Performance Pack
for 50cc to 100cc 4-stroke engines - 139QMB and GY6
Includes: 50mm Big Bore Kit with Big Valve Head & A9 Camshaft
This offer also includes the 69mm rocker arm assembly and all required gaskets
What's Included & Specifications
Big Valve Head
Cylinder Head
-50mm aluminum cylinder head with oversized valves
-69mm valve length w/ corresponding rocker assembly
-Dish Diameter- 50mm
A9 Camshaft
-High Quality Steel Production
-Long Life Ball Bearings (2)
Cylinder
-50mm Diameter (83cc)
-Aluminum Cylinder with Steel Cylinder Walls
Piston & Rings
-50mm Airsal High Compression Piston (83cc)
-50mm Airsal Piston Rings (high quality)
-13mm Wrist Pin & Retaining Rings
Rocker Arm Assembly
-Aluminum Rocker Arm Assembly (for 69mm valve length)
Gasket Set
-All of the required gaskets to install this kit
What is the difference between the 100cc kits and the 83cc kits?
The 100cc and 83cc kits have the same piston diameter (50mm), but the both kits actually only produce 83cc's. Kits that claim to be 100cc's are not actually 100cc's, so this is the first warning sign when trying to avoid inferior big bore kits. Kits that claim to be the true 83cc's have nothing to hide, and often are of higher quality than the "100cc" kits.
Are you looking for the performance kit that is also going to give you a dramatic speed and acceleration boost?
This kit is one of the many performance packages offered by STG. The STG Stage 1 Performance Pack with a 50mm Big Bore Kit with Big Valve Head and A9 Camshaft works as a direct replacement for stock parts on most Chinese and Taiwanese 4-Stroke 139QMB and GY6 engines. 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 big bore kits and camshafts that Scooters To Go has been using on their racing engines for years, and they are the only kits that Scooters To Go trusts when building a high performance machine. They are more reliable than the other kits available, and they are an all inclusive kit for an engine top end replacement with performance. Another major difference is the STG Performance 50mm Big Valve Cylinder Head, which acts as the ultimate upgrade for you big bored scooter. This cylinder head provides better air flow for both the intake and exhaust valve, because if its increased valve diameter. Because of this better air flow, more power can be produced, and the internal temperature of your engine can stay cooler. The cylinder head, in conjunction with the 50mm piston, cylinder, and high quality rings, creates a combination that is like none other. Now take that combination and add an A9 camshaft, which has higher cam lobes and longer valve opening duration, and you can generate even more power, truly taking advantage of the benefits of the big valve 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. With the proper clutching, carburetor jetting, and gearing, these kits are easily capable of speeds between 50 MPH and 55 MPH.
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. When these parts wear out, the piston, rings, and cylinder are the most worn, and the cylinder head and A9 camshaft typically still perform well.
Is there any additional work required besides the parts installation?
Yes, the carburetor needs to be re-jetted. Scooters To Go usually recommends a #85 main jet, and a #35 idle jet.
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 big bore kits and camshafts for years in their 83cc racing engines, and they are the only parts they trust. Scooters To Go trusts these performance big bore kit so much that they come with a 30-day (unlimited mile) warranty against product failure*.
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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.