Naraku 47mm Performance Cylinder Kit for the GY6 50cc engine
The latest V.2 Cylinder kit series from NARAKU, we can offer a more advanced product. As a 4 stroke cylinder upgrade is effectively just a hole, the emphasis on technological development was placed on the piston and compression. The piston has 2 additional CNC-machined oil grooves in the piston skirt, which collects engine oil to lubricate the cylinder bore and improve characteristics in extreme circumstances. The total size displacement is 47.4mm which makes this a 72cc Big Bore upgrade.
The special molybdenum coating aids the crucial running-in period. 2 oil recesses and a groove at each bearing point ensure the gudgeon pin is adequately lubricated. The compression ratio has been specially calibrated to the requirements of everyday running. Naraku’s high quality and very good power delivery cap off this cylinder kit. The kit can be used with the original carburettor, but we recommend changing the main jet. In most engines the Naraku 47mm Performance Cylinder Kit no crank case modifications will be needed. Just install and go.
All parts necessary for installation are included see picture for all items included in package. For use on 139QMB, GY6 50cc, and QMA139 four stroke engines.