Proven 125cc units are the 157Fmi, Svartpilen 125 and Suzuki GN125 engine. Find out more about them!

These units can be used in scooters, karts, motorcycles, mopeds or ATVs. The 157 Fmi engine, like other engines, has a simple design, which makes it easy to maintain, and their daily operation does not require costs.. For this reason, they work well both as a drive for two-wheelers for urban environments and for off-road trips. We present the most important information about these units.

157Fmi engine - technical data

Air-cooled, single-cylinder, four-stroke engine model 157Fmi. widely used, i.e. on off-road bikes, three-wheeled scooters, ATVs and go-karts.It features an electric starter with kickstand and CDI ignition, as well as a splash lubrication system. The unit is also equipped with a four-speed rotary gearbox. 

The diameter of each cylinder is 52.4 mm, the piston stroke is 49.5 mm, and the maximum torque and rotational speed: Nm / (rpm) - 7.2 / 5500.

Another advantage of the 157 Fmi is its attractive price, which, combined with efficient operation and low fuel consumption, makes the 157 Fmi an extremely economical unit.

Svartpilen 125 - technical characteristics of the motorcycle unit

Svartpilen 125cc is known from the motorcycle brand Husqvarna. It is a modern, four-stroke, single-cylinder, fuel-injected, liquid-cooled, double overhead camshaft engine.

The Svartpilen 125 cc 4T delivers plenty of power for its size, and thanks to the installed balance shaft, the smoothness of operation is even better. In addition, the unit is equipped with an electric starter powered by a 12 V/8 Ah battery. A 6-speed gearbox with a short gear ratio was also chosen. Peak engine power is 11 kW (15 hp).

Suzuki GN 125 - key news

Next to the 157Fmi engine, there is another interesting engine from a similar category - the GN 125, which is installed on the Suzuki motorcycle model of the same name. The device powers a custom/cruise type bike. As with Fmi and Husqvarna, the brand produced a single-cylinder four-stroke engine. It reaches a maximum power of 11 hp. (8 kW) at 9600 rpm. and maximum torque is 8,30 Nm (0,8 kgf-m or 6,1 ft-lb) at 8600 rpm.

It is also worth noting that the GN 125 motor is available in different power versions. These are units with a capacity of 11,8 hp, 10,7 hp. and 9,1 hp Online motorcycle shops offer access to almost all the parts that are necessary for the proper functioning of the engine.

What should I pay attention to when using 125cc engines?

When deciding on a 157Fmi engine or other of the described units, you must also prepare for proper service. 125 cc bikes should be regularly serviced by a workshop every 2 or 6 km. km. 

Older engines usually didn't have an oil filter, so the unit was easier to maintain, but this resulted in more frequent visits to the workshop as the oil in the chamber had to be changed. In turn, new units with fuel injection and liquid cooling can travel more kilometers.

The good news is that spare parts for these engines are quite cheap, and their maintenance does not require large financial costs. Regular maintenance ensures that the drives will serve you for a long time without any problems.