Hyper S-Stage Bore Up Kit 81cc Cross Cub 50 (AA06-1000001~)

The S-Stage bore up kit allows you to increase your engine to 81cc by simply replacing the cylinder and piston, while keeping the stock cylinder head.
By increasing the engine displacement from the stock 50cc to 81cc, and installing our sports camshaft and FI CON 2 (injection controller), output performance is improved, achieving powerful acceleration.
Furthermore, installing our exhaust system simultaneously will further enhance output performance.
Bore diameter: 48.5mm (stock 37.8mm) Compression ratio 11.3:1
Sports Camshaft: The optimal profile brings out the maximum performance of the stock cylinder head, improving output performance.
*Precautions regarding bore up kits
Always use high-octane gasoline.
If you change the displacement with a bore up kit, you will need a driver's license, insurance, and vehicle registration that meet the conditions.
Please note that we cannot answer questions regarding insurance or vehicle registration methods.
On the Cross Cub 50 (AA06), a guard plate is present on the front sprocket cover to prevent damage to surrounding parts from the drive chain.
If you install our 15T/16T drive sprocket, it will interfere with the genuine guard plate and cannot be installed, so this product will be necessary.
■The number of teeth on the stock drive sprocket is 13T.
■Steel Drive Sprockets: Our drive sprockets are available in 5 types: 12T, 13T, 14T, 15T, and 16T.
*For 17T, the guard will interfere and installation is not possible.
Applicable models
:Cross Cub 50 (AA06-1000001～)
*The image is for illustration purposes only, and the design and specifications of the products shown may change without prior notice. Please understand.