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NCY 61mm 171cc Cylinder Big Bore Kit that will increase the displacement of a Gy6 to 171cc! *You will NOT need to modify your engine case to accommodate this larger cylinder. Bolt On and Go!
NCY GY6 150 61mm Cylinder Kit 62.9mm outer sleeve diameter.
Give your GY6 based scooter some serious power with this bolt on 171.3cc kit for most GY6 125/150cc engines. As far as we know, this is the only 61mm cylinder kit for the GY6 engine that exists in the US. With most 61mm cylinder kits, you have to cut the engine cases in some way to make it fit (Outer Cylinder Skirt Diameter: 65mm). Not so with this kit (Outer Cylinder Skirt Diameter: 62.9mm).
It also has a light weight cut-down piston to increase performance even more. It’s highly recommended to jet this kit significantly rich because of its high performance capability.
Carburetor rejet will be neccessary. Professional installation is highly recommended!
NO WARRANTY ON RACE ENGINE parts or engine bore up kits. There is no warranty stated or implied due to the unusual stresses placed on these parts and because we have no control over how they are installed and used. Steady Garage will not be held liable for any failure or damage caused directly or indirectly from use of these products or engine. The installation and use of these products or engine shall be conclusive evidence that the user assumes full responsibility for any damage caused directly or indirectly by their use.
This product is NOT legal for sale, installation, or use on a pollution-controlled vehicle in the state of California. This product is NOT CARB legal. Legal only for racing vehicles in closed course competitions which will never be driven on a public right of way.
This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; does not meet regulations of pollution-controlled roads or highways.