Motorcycle engine
Welcome to our motorcycle engine and scooter engine category! Here you will find a wide selection of engines to fit your specific needs. We offer engines in a variety of sizes, from small and fuel-efficient to larger and powerful options. You'll find engines with different horsepower and torque ratings, making it easy to find the perfect option for your riding style. Whether you're looking for a two-stroke or four-stroke engine, we have it all in one place. Our engines are available in both air-cooled and liquid-cooled options. You'll find engines to fit popular brands such as Honda, Yamaha and Suzuki. We also offer a selection of performance upgrades and maintenance parts for your engine. From air filters, carburetors and exhausts, to cylinder heads and pistons. Browse our selection today and find the perfect engine for your motorcycle.
What to look for when buying an engine?
Motorcycles are all different, so you can't just put the first engine you see in your vehicle.Before you buy an engine for your moped or motorcycle, decide on the following parameters:
- cooling system - air or liquid cooling, natural circulation or forced by a fan;
- capacity - is measured in cubic centimeters and determines fuel consumption from 50 to 389cc;
- number of cylinders - 1 or 2 cylinders are used in two-wheeled vehicles
- number of strokes - determines the number of cycles in which the shaft rotates, affecting traction and efficiency; 2 or 4 strokes are used in motor vehicles.
The liquid cooling system is quite expensive, so it is usually used on more expensive motorcycles and mopeds. A cheaper version is a forced cooling system, in which air is blown through a separate mechanism, such as a fan with a cylinder housing system, this type is found most often in scooters. The cheapest option is free cooling, provided by fins on the cylinder body and head.
Two-stroke engines have a simpler design, are lighter and offer a lot of power, but consume much more fuel, have a shorter life span and make more noise. Four-stroke engines are quieter, use less fuel and have a smoother ride, but are more complicated.
Motorcycle engine categories
There are four main categories, with capacity being the main criterion:
- 50 to 125cc - used in mopeds, scooters and small motorcycles quads and mini-pockets, usually a single-cylinder, two-stroke or four-stroke system;
- 125 to 250cm3 - designed for scooters and light motorcycles, operate on a single cylinder, come in two-stroke as well as four-stroke cycle;
- 250 to 500cc - fitted to medium-weight motorcycles, like the previous models, they come in single and two-cylinder, two-stroke and four-stroke versions;
- above 500cc - are found in heavy motorcycles with two and even four cylinders.
Where to buy an engine for a scooter, moped or motorcycle?
Our online store sells engines for scooters, mopeds and motorcycles with different parameters and dimensions. In the presented assortment you will find the most popular engines for scooters and mopeds: 139QMB, 139FMB, 152FMH, 152QMI, as well as engines for motorcycles, quads, ATVs, pocket bikes, mini cross and much more. Before making a purchase, read carefully all the parameters of the product.
We encourage you to use the filters on our site to properly customize your search for complete engines.
Which engines in scooters are the most popular?
First of all, there are two-stroke engines from Japan, as well as Chinese scooters of different price ranges and, consequently, quality. European vehicles are less popular, primarily due to the high price, less established supply structure and a significant shortage of spare parts in case of repair needs.
The conclusion is that two-stroke Japanese and four-stroke new Chinese engines are currently popular, with each successive combustion standard improving the quality of the end product, but the price goes up along with the quality. Two-stroke engines are easier to operate, maintain and repair, but four-stroke units of decent quality show greater reliability, economy and environmental friendliness.
How does a two-stroke scooter engine work?
The principle of operation is based on burning a mixture of gasoline and air along with oil, which usually comes from a separate tank and, mixing with gasoline and air, is fed into the combustion chamber. It is here that the oil performs its function of lubricating the engine's main components, of which there are far fewer compared to four-stroke engines. These engines are less economical because part of the fuel-air mixture flows out of the combustion chamber unhindered in the exhaust cycle. Two-stroke engines are very sensitive to the setting of the exhaust system, which is preset at the factory for each specific model.
How does a four-stroke scooter engine work?
The four-stroke engine in a scooter is more complex than the two-stroke version, much more reliable and more economical. The engine oil is not fed from the tank, but remains in the crankcase, where it lubricates all the necessary components. The oil level in a four-stroke engine cannot run out as it does in a two-stroke, but it must be checked periodically and topped up if necessary. Oil should be changed periodically, as it loses its properties over time, and metal deposits and dust collect in the oil. Four-stroke engines are the future of scooter construction. Also, do not forget about the electric drive, but for now it is not so popular.
Is it necessary to change gears in a scooter?
Almost all modern scooters are equipped with a continuously variable transmission (CVT). In this transmission, a variator and a rear clutch, connected by a drive belt, are responsible for instantly adjusting the transmission ratio by changing the position of the drive belt. This type of transmission makes the scooter very convenient to operate the vehicle in the city and does not cause difficulties for beginners. All you have to do is sit down, turn the handlebars and ride, nothing complicated.
What does a variator do in a scooter? How does the drive work?
The variator, together with the rear clutch, distributes torque from the crankshaft of the scooter to the rear wheel depending on the speed, load and speed of the crankshaft. Seemingly a complicated system, it is actually very simple. Unlike a car, which uses many gears, shafts and other components, the scooter's drive train consists of only a variator and a rear clutch. There is a belt between the two pulleys, and it is this belt that transfers torque from the engine to the rear wheel.
How does the clutch work in a scooter?
The variator drive pulley is mounted in the same assembly as the rear clutch. The rear clutch consists of lined jaws, which are compressed by springs toward the center, and a bell cup, with which the clutch engages by increasing engine speed. By adjusting the stiffness of the clutch spring, we regulate the moment of clutch actuation at certain engine speeds. For example, they need to be stiffer for a fast start and softer for a soft start.
How does the transmission work in a scooter?
The gearbox is the final part of the transmission to the rear wheel. The task of the gearbox is to reduce the speed of the drivetrain and adjust it to the rear wheel. It is with the help of the gearbox that the optimal gear ratio can be found, at which the dynamics and top speed of the scooter will be within the most comfortable limits. The gear ratio can be adjusted by changing the gears of the transmission, but an increase in top speed will result in a decrease in dynamics, and instant dynamics will consequently result in a decrease in top speed. If one decides to change the gear ratios, such tuning usually begins with increasing the piston volume, adjusting the carburetor and adjusting the variator.
The gearbox operates in an oil bath and the transmission oil should be changed every 1-2 seasons, depending on the intensity of use.
How do the cylinder and piston work in a motorcycle engine?
The cylinder and piston group is the main component of an internal combustion engine. This includes the cylinder, cylinder head and piston. The principle of the engine is simple - the fuel mixture prepared by the carburetor enters the combustion chamber inside the cylinder, where it is compressed by the piston and ignited by the spark plug. At this point, an explosion occurs, which pushes the piston, which in turn rotates the crankshaft through the connecting rod. The crankshaft transmits drive to the variator, and torque is transmitted via the belt to the clutch, transmission and rear wheel, respectively.
The cylinder of a two-stroke and four-stroke scooter and motorcycle can be made of cast iron, aluminum or a combination thereof. Typically, stock parts are made of cast iron, while aluminum is used in tuning cylinders from well-known brands such as Polini, Malossi, Stage6, etc.
Does the muffler affect performance on a scooter and motorcycle?
The exhaust system is an important component that makes the engine work properly. This is especially true for two-stroke engines, where the muffler, through the resonator inside, returns to the cylinder some of the power lost during ignition of the mixture. It is very finely tuned and tailored specifically to the scooter model. Simply put, the muffler for a two-stroke scooter, in addition to directly reducing noise and venting exhaust gases, ensures proper circulation of gases in the engine, so that horsepower can be significantly increased.
In four-stroke scooters and motorcycles, the case is different. The muffler is needed only to minimize noise and gas emissions with minimal obstructions, so the requirements for muffler design are minimal.
What is meant by a 4T engine?
A four-stroke engine is a reciprocating internal combustion engine in which each cylinder operates over two crankshaft revolutions, or four piston strokes.
What is the difference between a two-stroke engine and a four-stroke engine?
4T and 2T refer to the number of strokes in an engine's combustion cycle. A four-stroke engine, or 4T, makes four different strokes (intake, compression, power and exhaust) during one combustion cycle. A two-stroke (2T) engine performs only two strokes (intake and power/exhaust) in one combustion cycle.
The main difference between the two is that four-stroke engines tend to be more efficient and emit less exhaust than two-stroke engines. This is because a 4-stroke engine has an extra stroke (compression), which allows for more precise combustion and fuller burning of fuel. As a result, four-stroke engines tend to be cleaner, more fuel-efficient and more powerful.
On the other hand, two-stroke engines tend to be less complex, lighter and can have a higher power-to-weight ratio than four-stroke engines. They also tend to be cheaper to produce and maintain.
When it comes to motorcycles and scooters, 4-stroke engines are commonly found in larger, touring motorcycles and scooters, while 2-stroke engines are usually found in smaller, sportier models or in older scooter models.
It is worth mentioning that many countries are now tightening emissions regulations, which has led to a decline in the production of 2-stroke engines for motorcycles and scooters and an increase in the production of 4-stroke engines.
Which engine is better 2-stroke or 4-stroke?
The difference in the lubrication system makes the life of a 4-stroke engine much longer, as all moving parts are more thoroughly lubricated and the risk of oil starvation is minimized. On the other hand, two-stroke engines are less technologically advanced and therefore much easier to maintain.
What are the advantages of a two-stroke engine?
The main advantages of a two-stroke engine remain its smaller size and weight compared to its four-stroke counterpart.
Why is a two-stroke engine more powerful than a four-stroke?
For the same displacement, a two-stroke engine is more powerful because the explosion, occurs with every revolution of the crankshaft, while in a four-stroke engine it occurs every two revolutions.
Which engine is more economical two-stroke or four-stroke?
Four-stroke engines use less gasoline - this is an undeniable fact. However, four-stroke engines of the same horsepower tend to be heavier than their two-stroke counterparts, as well as more expensive.
How to properly maintain a motorcycle engine to ensure long life and optimal performance?
Proper motorcycle engine maintenance is crucial to ensure longevity and optimal performance. Here are some tips on how to properly maintain a motorcycle engine:
- Regular oil and oil filter changes: this is one of the most important maintenance tasks. Make sure you change the oil and filter at the recommended intervals as specified in your motorcycle manual. This will help keep the engine lubricated and remove any contaminants.
- Check and adjust valves: most motorcycle engines have adjustable valves that should be checked and adjusted at regular intervals. This will help maintain proper valve clearance and prevent engine damage.
- Check and adjust chain or belt tension: if your motorcycle has a chain drive, or belt drive, it is important to check and adjust tension at regular intervals. A loose chain or belt can cause damage to the engine and other components.
- Check and clean the air filter: a dirty air filter can restrict air flow and reduce engine performance. Be sure to check and clean the air filter at regular intervals.
- Check and clean spark plugs: dirty or worn spark plugs can cause poor engine performance and difficult starting. Make sure to check and clean spark plugs at regular intervals.
- Check and maintain the cooling system: a properly functioning cooling system is essential to prevent engine damage. Make sure you check the coolant level, hoses and radiator for leaks, and clean the fins on the radiator.
- Check the battery regularly: Make sure you keep the battery clean and check the electrolyte level. Cold weather can be hard on batteries, so take extra care in the winter.
By following these tips, you can keep your motorcycle's engine running at its best and survive for many miles.
What are some common upgrades and modifications that can be done to improve the performance of a motorcycle engine?
There are several upgrades and modifications that can be done to improve the performance of a motorcycle engine. Here are some examples:
- Upgraded air filter: A high-performance air filter can increase airflow to the engine, which can result in increased power and torque.
- Efficient exhaust: A high-performance exhaust can reduce back pressure and improve exhaust flow, which can increase horsepower and torque.
- Engine tuning: Engine tuning can include remapping the engine control unit (ECU) or adding high-performance parts, such as a high-performance camshaft or high-compression pistons. These modifications can increase power and torque.
- Lightweight flywheel: A lightweight flywheel can reduce the rotational mass of the engine, which can result in faster engine speeds and better throttle response.
- Larger carburetors: A larger carburetor can improve airflow and increase the amount of fuel delivered to the engine, which can result in increased horsepower and torque.
- Forced induction: forced induction systems, such as turbochargers or superchargers, can be added to the engine to compress the air and increase power and torque.
- Power Commander: these are devices that allow reprogramming of the engine's fuel and ignition maps, which can result in increased horsepower and torque.
It is worth noting that some of these modifications may require additional maintenance, and some may not be legal in some areas. Therefore, it is important to research and consult a professional mechanic before making any improvements to your motorcycle engine.
How does engine size affect the power and performance of a motorcycle?
The size of a motorcycle engine can have a significant impact on its power and performance.
In general, larger engines tend to produce more horsepower and torque, which can result in better acceleration and top speed. Larger engines are also more durable and can withstand greater loads, which can make them more suitable for high-performance driving.
On the other hand, smaller engines are more fuel-efficient and easier to handle, which may make them more suitable for city driving or for riders who are less experienced. They also tend to be lighter, which can make a motorcycle more agile and easier to handle.
It is worth mentioning that engine size alone is not the only factor that affects power and performance. Other factors such as engine design, compression ratio and the quality of the fuel injection system also play a role.
In addition, the power of a motorcycle does not depend only on the size of the engine, but also on its design and tuning. A smaller engine can be modified to produce more power than a larger engine, and vice versa. Therefore, it's important to look at the whole package, not just engine size, when considering the power and performance of a motorcycle.