139FMB 4T engine - how is it different?

The 139FMB engine develops power from 8,5 to 13 hp. The strength of the unit, of course, is durability. Regular maintenance and reasonable use can ensure that the device will work stably for at least 60 hours. km. Combined with low running costs – fuel consumption and parts price – the 139FMB engine is definitely one of the most attractive products on the market.

Actuator 139FMB technical data

The 139FMB engine is an overhead cam internal combustion engine. The overhead camshaft is the overhead camshaft where this element is used to actuate the valves and is located in the engine head. It can be driven by a gear wheel, a flexible timing belt or a chain. The SOHC system is used for the dual shaft design.

The motor has a mechanical four-speed gearbox, and the design is based on the Honda Super Cub engine, which enjoys excellent reviews among users. The 139FMB engine is a product of the Chinese company Zongshen.

Engine 139FMB - different options for the unit

First of all, it is worth noting that this is not only the name of the 139FMB unit itself. This nomenclature also covers options such as 139 (50 cm³), 147 (72 cm³ and 86 cm³) and 152 (107 cm³), which are installed on popular motorcycles, scooters and mopeds.

139FMB 50 cc engine - technical data

The 139FMB engine is an air-cooled, four-stroke, single-cylinder, overhead-camshaft engine. The designers used the upper arrangement of the gas distribution phases, and the unit has a working volume of 50 cm³ with a piston diameter of 39 mm and a piston of 41,5 mm. Piston pin diameter 13 mm.

The device has a compression ratio of 9:1. The maximum power is 2,1 kW/2,9 hp. at 7500 rpm with a maximum torque of 2,7 Nm at 5000 rpm. The 139FMB engine can be equipped with an electric and kick starter, as well as a carburetor. The 139FMB engine was also very economical. The average fuel consumption for this unit is 2-2,5 l / 100 hp.

Engine Information 147FMB 72cc and 86cc

In the case of both variants of the 147FMB version of the motorcycle, we are dealing with four-stroke engines with an air-cooled overhead camshaft. These are single-cylinder variants with overhead valve timing, a four-speed transmission, a carburetor, and CDI ignition and chain.

The differences are manifested in the working volume of 72 cm³ and 86 cm³, respectively, as well as the piston stroke diameter - in the first version it is 41,5 mm, and in the second 49,5 mm. The compression ratio is also different: 8,8:1 and 9,47:1, and the maximum power: 3,4 kW / 4,6 hp. at 7500 rpm and 4,04 kW / 5,5 hp at 7500 rpm min. 

107cc news

The 139FMB family also includes a 107cc single-cylinder four-stroke engine. see air-cooled.³. For this version, the designers also used an overhead valve timing system, as well as a 4-speed gearbox, electric and foot starter, as well as a carburetor and CDI ignition. 

The diameter of the cylinder, piston and pin in this unit was 52,4 mm, 49,5 mm, 13 mm, respectively. The maximum power was 4,6 kW / 6,3 hp. at 7500 rpm, and the maximum torque is 8,8 Nm at 4500 rpm.

Should I choose the 139FMB engine?

The 139FMB engine can be a very good choice due to the fact that it can be installed on almost all models of Chinese mopeds, such as Junak, Romet or Samson, which have a 139 FMA/FMB frame. In addition, it has a reputation as a reliable and top-selling division of Zongshen. Upon purchase, the unit is filled with 10W40 oil - the engine assembly is ready for installation on a motorcycle, moped or scooter.

It should also be noted such features of the unit as a culture of work, an attractive price, an accurate gearbox and economical fuel consumption. Moreover, you can be sure that you choose the offer of a reliable manufacturer. The Zongshen brand is not only engaged in the production of drives for mopeds. He also collaborates with well-known manufacturers such as Harley-Davidson or Piaggio. Combined with relatively cheap maintenance and durability, the 139FMB engine would be a good choice.

Main photo: Pole PL via Wikipedia, CC BY-SA 4.0