72cc cylinder kit with complete cylinder head for 50cc 139FMB or 72cc 147FMB 4-stroke engines

Product Description

Give your horizontal 50cc four-stroke engine more torque and better performance with this complete 72cc cylinder and cylinder head kit. The kit is designed for Chinese 139FMB and 147FMB complete engines, as used in various Dax, Monkey, PBR, Cub, and other replicas with a horizontal four-stroke engine.

A 139FMB is typically a standard 50cc horizontal four-stroke engine block. This set increases the displacement to approximately 72cc. A 147FMB is the 72cc variant of the same complete engine and can use this kit as a replacement or rebuild kit.

The cylinder has a bore of 47 mm and comes with a complete cylinder head, piston, and the necessary gaskets. The cylinder head is equipped with covers and a sportier camshaft and is largely pre-assembled. The piston features additional lubrication ports at the piston pin and piston skirt, which improve lubrication during operation.

Thanks to the larger displacement, the complete engine delivers noticeably more torque and accelerates better than with the standard 50cc cylinder. Customers generally report a good fit and easy installation on compatible 139FMB complete engines.

Features

• Displacement: approximately 72cc
• Cylinder bore: 47 mm
• Suitable for horizontal four-stroke engine blocks
• For engine codes 139FMB and 147FMB
• Complete cylinder head with covers
• Equipped with a sportier camshaft
• Piston with additional lubrication ports
• More torque and better acceleration than the standard 50cc
• Suitable as a rebuild or upgrade kit

The kit consists of

• 72cc cylinder
• Complete cylinder head
• Piston
• Piston rings
• Piston pin
• Two piston pin clips
• Cylinder base gasket
• Head gasket
• Other gaskets shown

Suitable for

This set is intended for many Chinese horizontal 50cc four-stroke engine blocks with engine type:

• 139FMB
• 147FMB
• Certain 1P39FMA variants with corresponding dimensions

Commonly used in, among others:

• Skyteam Dax
• Zhenhua Dax
• Chinese Monkey and Gorilla replicas
• PBR replicas
• Cub replicas
• Various pit bikes and manual-shift mopeds with a horizontal 4-stroke engine