Motorcycle engine parts

Like a car, a motorcycle "eats" gasoline to get the energy to move. The big difference between the two is that a motorcycle has only two wheels. Engine power is transferred to the rear wheel. Although the engine is often much weaker than a car's, the motorcycle can reach the same speeds as a car due to its streamlined profile and lighter weight. Motorcycles tend to accelerate faster than cars and are more maneuverable on narrow roads and off-road.

A motorcycle engine operates very similarly to a car engine. Fuel burning in the engine's cylinders pushes the pistons, which turn the crankshaft. In the transmission, the rotational motion of the crankshaft is transferred to the chain. This is what turns the rear wheel. But a motorcycle also needs a gearbox: to reduce the excessive speed it receives from the engine. 

A two-stroke engine produces more power

Four-stroke engines are used most often in cars. Their cycle consists of four parts: mixture intake, compression, combustion and exhaust. It requires two forward and backward movements of each piston. A two-stroke motorcycle engine performs all the same operations in one complete circular motion: when the piston rises, intake and compression occur. And when lowered, combustion and exhaust. Therefore, theoretically, at the same speed, that is, the same rpm, a two-stroke engine should be twice as powerful as a four-stroke. In practice, however, due to the size of the two-stroke engine and the increased friction in the engine, its advantages are not so great. However, a two-stroke internal combustion engine is about 1.5 times more powerful than a four-stroke engine.

Replacing engine parts in scooters and motorcycles

We recommend replacing parts in your motorcycle and scooter engine on a regular basis, rather than waiting until a part is really close to being out of service. A motorcyclist should have common replacement parts in stock in his workshop. For example, you can find bolts, nuts, gaskets, seger rings, bearings of various sizes for motorcycle and scooter repair.

In this section you can buy spare parts for motorcycle engines, scooter engines and for engines installed in quads (ATVs). Here you will find not only performance-enhancing tuning parts, you will find maintenance and repair products needed for most engines, whether it is a 50cc scooter, a 110cc moped, a 250cc maxi scooter or a motorcycle from the manufacturer Zontes or Benelli. The parts sold here at fair prices form the basis for keeping your engine in the best possible condition, and a working engine can later be a good base for all subsequent tuning projects.

We stock tuning parts for scooters, such as tuning cylinders, reinforced crankshafts, suitably strong pistons, tuning variators. Our products meet high quality standards and are supplied by reputable manufacturers.

In this spare parts catalog you can find spare parts for all types of vehicles. If you are unable to find the right part, we will be happy to help you by phone, e-mail or contact form.

At Motor-x you can buy engine parts cheaply and they are of good quality, they will not disappoint your expectations.

Which engine is better four-stroke or two-stroke?

Due to their higher efficiency, 4-stroke engines are more powerful. However, lighter two-stroke engines can have a higher power-to-weight ratio and are considered more practical due to their single-cylinder engine, while a four-stroke model needs several cylinders to provide consistent power.

How do I find out what kind of engine I have in my scooter?

In scooters, the engine type is engraved near the rear transmission, it is usually located in a clearly visible place and can be read without removing any part. Example engine code 139QMB, by deciphering the code you can determine what engine it is:

1 - one cylinder.
39 - diameter of the piston.
Q - forced-air cooling (engine fan).
M - type of engine: motorcycle (scooter).
B - capacity designation, B = 50ccm, D = 70 ccm, H = 110 ccm, I = 125 ccm.
How much does the engine in a motorcycle last?

Motorcycle engine is able to withstand up to 100 thousand kilometers if it is properly serviced during this time, it is necessary to carry out general engine overhauls at certain intervals.

How to increase power in a scooter

The simplest, most reliable way to increase power is to increase engine displacement, choosing a complete set of cylinder and head, which includes, cylinder, complete head, piston, rings and a set of gaskets, we are able, in a painless way, to increase capacity and thus power.

Another way to increase the power of the scooter is to replace or unlock some components of the scooter, for example, a blocked variator, blocked muffler (exhaust), blocked module, blocked or improperly adjusted carburetor.

What gives you a larger cylinder?

Larger cylinder diameters mean larger valves, which means the engine can pump more air through them each cycle, allowing for better combustion of the mixture. That is, the more air, the more power.

Is it possible to put a 125 engine into a 50 scooter?

Technically speaking, a larger capacity complete engine can usually be put into a 50 ccm scooter, by doing so the scooter changes its legal classification, such a vehicle cannot be driven on the road without making a new registration certificate. Inserting a 125 ccm engine into a 50cc scooter, is not recommended, a better solution is to replace the cylinder and head set with a larger capacity, for example, 80 ccm.

What does engine displacement mean in a motorcycle?

Engine displacement is the sum of the volume of all the cylinders of the engine of a motorcycle, scooter, moped, ATV, snowmobile, hydraulic scooter.

How to measure the length of the belt cover in a scooter?

The length of the belt cover in a 4T scooter with a 139QMB engine will tell us what length of belt we need, there are 3 variants of the 139QMB engine: 40cm, 43cm and 46cm. The easiest way to measure the length of the cover is to measure the gasket, the dimension of the cover is counted from its beginning to the very end of its adhesion to the kerter of the engine.

How often do you adjust the valves on a motorcycle?

There is no clear-cut appropriate, different engines require valve adjustment at different intervals, ranging from 5 thousand kilometers to 30 thousand.

How to know that the valves are to be adjusted?

A sure sign that it's time to adjust the valve lash is if the engine makes a loud clicking or knocking sound when starting, or if you experience a loss of engine power.