cylinder kit -NARAKU- 180cc 63mm forged piston for GY6, Kymco AC

Big Bore Kit 180cc for GY6 based engines from 125/150cc with forged piston! The bore is 63mm, so the crankcase must be machined to accommodate the cylinder. This requires clean work and accuracy, as it goes very into the marginal areas. No plug-and-play installation.
The kit fits many air-cooled 4-stroke Kymco engines 125-150cc (maxi scooters) as well as Chinese import vehicles with 125/150cc GY6 engine (scooter, quad & buggy). Can be used with original cylinder head.

To get the full power out of the cylinder, an additional cylinder head with larger valves can be installed for GY6 engines (not Kymco). For those who want more, a sports camshaft with modified timing is still available.

The outer diameter of the cylinder liner (this protrudes into the crankcase) is 65mm.

The highlight of this Naraku cylinder kit is the forged piston: For more load capacity and reduced friction values. The raised piston crown also provides more compression._{AI-translation}