Cylinder kits and Big Bore Kits


2 Stroke Pocket Bike Performance and Big Bore Kits

Pocket bike 44mm big bore kits for 47cc and 49cc engine

Click here to view 2 stroke pocket bike big bore Kits


4 Stroke ATV and Dirt Bike Big Bore Kits

Click here to view 4 stroke big bore Kits

Click here to view 4 stroke big bore Kits


4 Stroke Scooter, ATV, Go Kart, Buggy GY6 Big Bore Kits

Click here to view 4 stroke GY6 Big Bore Kits

Click here to view 4 stroke GY6 Big Bore Kits


2 Stroke Scooter and ATV Jog Minarelli Big Bore Kits

Click here to view 2 stroke Scooter Jog Minarelli Big Bore Kits

Click here to view 2 stroke Scooter Jog Minarelli Big Bore Kits


Old section of web site

More kits to come!


4-Stroke 125cc to 140cc Big Bore Kit

4-Stroke 125cc to 140cc Big Bore Kit

Specs This Lifan kit coverts your motor into a 140cc motor. This kit wont fit 125cc vertical motors. The kit comes with everything shown in the picture above. It uses a 55mm wide, 42mm high piston, uses 15mm wrist pin.. Check your piston, if your have a 13mm wrist pin. then this kit wont fit your 125cc motor. This kit wont fit all 125cc motor, only ones that use 15mm wrist pin.

125cc to 140cc Big Bore Kit

50cc to 70cc Big Bore Kit

This head kit lets you convert your 50cc motor into a 70cc motor.

90cc to 100cc Big Bore Kit

This head kit lets you convert your 90cc motor into a 100cc motor.



GY6 59mm big bore kit

This kits can fit to following GY6 Engines models KYMCO: GY6 125cc and 150cc scooters MXer 150, MXU 150 TGB GY6 125CC, HONDA GY6 125CC SYM GY6 150cc VENTO Phantom R4i 125cc 150cc, Strada RX150, Yamati, Verucci, Baccio, Viva, Matrix, Wuzzi, Lifan and Clones

Specs comes with a 58.5mm Aluminum cylinder head, 59mm Aluminum cylinder block, High Performance Camshaft. This performance Kit is ready to bolt on without any modification. can fit Honda base Gy6 Engine & China Cloned Gy6 152QMI, 157QMJ. (cannot install to P152QMI, nor P157QMJ Enigine)



GY6 Titanium Big Bore Kit

GY6 59mmTitanium Big Bore Kit

Specs comes with a 59mm Aluminum cylinder head, 59mm Titanium cylinder block, High Performance Camshaft. This performance Kit is ready to bolt on without any modification. can fit Honda base Gy6 Engine & China Cloned Gy6 152QMI, 157QMJ. (cannot install to P152QMI, nor P157QMJ Enigine)

This kits can fit to following GY6 Engines models KYMCO: GY6 125cc and 150cc scooters MXer 150, MXU 150 TGB GY6 125CC, HONDA GY6 125CC SYM GY6 150cc VENTO Phantom R4i 125cc 150cc, Strada RX150, Yamati, Verucci, Baccio, Viva, Matrix, Wuzzi, Lifan and Clones



2-Stroke Big Bore Kits


43cc to 49cc Big Bore Kit

2-Stroke 43cc to 49cc Big Bore Kit

Specs: This Upgrade kit converts your 43cc motor into a 49cc motor. If you don't know if your motor is a 43cc or 49cc motor. The 43cc motor uses the 40mm piston rings, and 49cc motor uses the 44mm piston ring. The picture above shows the cylinder differences.

49cc Cylinder Upgrade kit (for Mid bikes)



47cc and 49cc High Compression Kit

47cc and 49cc High Compression  Kit

Specs: 40mm or 44mm Billet top (round style), Piston, NGK Spark Plug, Piston Rings, gaskets, bolts. This kit will give your motor more POWER.

47cc 40mm, 10mm pin High Compress Cylinder Kit

49cc 44mm cylinder, 12mm wrist ping High Compress Cylinder Kit


47cc to 49cc Dual Channel Cylinder Big Bore Kit

2-Stroke 47cc to 49cc Dual Channel Cylinder

Specs: This performance kit is design for 47cc motors (that uses a 40mm piston).

The 44mm cylinder has 2 ported channel, which is designed to work with the modified Piston that has extra boast port to give your bike that extra kick. The kit comes with everything shown in the picture.


47 to 49cc Big Bore Kit

47 to 49cc Big Bore Kit

Specs: Upgrade your 40mm 47cc motor to a 44mm 49cc motor. Comes with 49cc Cylinder, Cylinder gasket, 49cc piston, pair of 49cc piston ring, Wrist pin, wrist bearing, 2 cir clip.

49cc Upgrade Kit (for 47cc Mini-Pocket bikes)



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