Big Bore Kit – Convert 50cc to 72cc

Big bore kit with big valve head for converting your 50cc engine to 72cc.

The kit is a creation of our very own; displacement has been increased from 49cc to 72cc. Various parts were tested to find the very best combination.
The resulting power was increased by around 33%, slightly downhill increased top speed to 53mph (+8mph), steady uphill increased top speed to 39mph (+7mph), and acceleration was increased drastically.
AMAZING FROM A 50cc 4-STROKE!

Kit includes -
Big valve head 23mm/20mm
Cast cylinder
Nibbi PE17FL carburetor
Red air filter
Intake manifold
Head and cylinder gaskets
Piston kit with rings
Spark plug

Barrel dimensions -
Bore diameter - 47mm
Cylinder sleeve length - 88.7mm
Outer cast length - 63mm (face to face)

Made to fit - YX, Lifan, may fit other engines (check dimensions)

Additional parts that may be required -
Throttle cable
Carburettor spacer set ( Available in our store - ENP016-2 )
24mm exhaust gasket ( Available in our store - MXA0194 x5 )
Valve cap covers ( Available in our store - MXF0178 )
Take off plate and gasket ( Available in our store - MXF0134 )
Cylinder head rocker inspection cover and gasket
Timing chain cover and gasket

Please note: The head is provided as seen in image one; no covers are included. Typically, the engine's original ones would be utilised.

We advise that a mechanically able person should install this big bore kit; valve clearances will need to be set upon installation.

This product is designed for race purposes only; as such, no warranty will be provided.