Motorized bicycles can have two types of engines: 2 strokes and 4 strokes. Two stroke motorized bicycle kits are simpler and are a little less bulky than 4 stroke kits. However, many favor 4 strokes because of the valves present & extra torque/power you get. How 4 stroke engines work is simple: when the engine operates, the pistons go through their cycle to produce movement for your motorized bike. This is caused by the downward and upward motion of the pistons. After the 4 events (intake, compression, power & exhaust) are complete, it begins again. Bottomline is compared to 2 stroke engines, these kits offer better efficiency, reliability, power, and balance. They also separate the fuel from oil by providing a reservoir so that oil doesn’t need to be added as frequently compared to a 2 stroke engine. These features, among others, make 4 stroke bicycle engines kit very popular.
List of 4 Stroke Bicycle Engine Kit Options
49cc BBR Tuning 5G Pull Start Bicycle Engine Kit- 4 Stroke
bikeberry.com If you’re searching for a long-lasting, reliable, and tough engine kit for your bicycle then this particular 4 Stroke Bicycle Engine Kit should be among your list of options. This is an all-new version of the 49cc BBR Tuning 4-stroke bicycle engine kit that has pull start and clutch features, with the latest facilities like upgraded components and so on. This brand is a popular choice when it comes to quality motorized bike kits and is one of the most well known. One interesting feature is the killswitch that allows you to easily turn the engine off in addition to a separate oil reservoir. These features, among others, comprises the many reasons this brand is a customer favorite. And with it being a 4 stroke engine, it’ll cause less emissions as unburnt oil in a 2 stroke engine is removed via the exhaust. Additionally, there’s a centrifugal clutch, which will allow you to start the bike without pedaling. To start your bike, all you need to do is pull the cord and press the throttle and then you’re off. When your bike is at rest, the engine will stop automatically. This package is perfect for bikers looking for an efficient and reliable 4 stroke engine.
Product Features:
- This engine has a width of 7 inches, length of 9.5 inches, and height of about 9 inches.
- The kit consists of a mounting plate that has a size of 25 mm to 29 mm.
- If your bike has a larger frame then the plate will require modification. Other than this the kit offers features like,
- 20 to 25 mph weight and gear ratio
- 2 to 3 Horsepower
- Oil capacity is 250 milliliters
- The fuel economy is 100 to 150 mpg.
BBR Tuning 49cc 5G Lock-N-Load Friction Drive Bicycle Engine Kit – 4-Stroke
The BBR Tuning 49cc 5G Lock-N-Load offers another option for simple motorization of your bicycle. Dissimilar from other models of motorized bike kits, which usually mount the middle of the vehicle frame; this kit mounts the motor straight over the wheel and this gives more options you can use this product on. This engine mounts over the wheel of the bicycle and for this, you won’t have to fix a rear drive sprocket. The direct friction from the driveshaft mount will pull on the wheel while creating friction against the propel and the tire. Also, you’ll get a complete digital installation guide with this 4 stroke bicycle engine kit. So when you need a motor for your bike then you can consider this product.
Features of the engine:
- The mount gives support to the tire and the engine is 9 x 9.5 x 7 inches.
- The engine will go more than 100 miles per gallon with a 15 mph
- The displacement is 49cc
- It has 2 to 3 horsepower
BBR Tuning 38cc Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke
Motorization of your bike will be a lot easier with the BBR Tuning 38cc Lock-N-Load Friction Drive Bicycle Engine Kit . Again, this item, like the previous model, mounts the motor straight over the wheel giving you more biking options this product can be installed on. Also, no rear drive sprocket will be necessary. Of course, the main difference is that this kit is a 38cc whereas the previous model is a 49cc.
Engine Features:
- It’s a 4 stroke engine
- It has an automatic air cooling system
- The engine provides counterclockwise rotation of the PTO shaft
- The displacement is 37.7cc
- The engine will give more than 100 miles on 15 mph
- There is a transistor magneto system for the ignition.
BBR Tuning Complete 79cc The Beast Pull Start 4-Stroke Bicycle Engine Kit
Are you ready to turn the old bike into a superstar? With this engine kit, that’s possible. This is a 79cc 4 stroke engine and it’ll turn your old bike into a super fast & reliable form of transportation. As you know, the 4 stroke is the most powerful system in the market, so this one may truly be an upgrade for your bicycle. This system is known for both its torque and speed. You can get speeds like 35 mph which is quite fast. Also, the centrifugal clutch removes the manual handling of the clutch when changing speeds (ideal for when encountering multiple stop signs). This makes riding your motorized bike a lot easier. Finally, you won’t have to worry about the cost of upgrading as this version is self-sufficient enough to provide dependable transportation for the long haul.
Features of this motor:
- The horsepower is 3
- You will get counterclockwise shaft rotation.
- Stroke length is 37 mm
- The sound rating is 104 dB
- Displacement is 78.5cc to 79cc
- It has horizontal mount orientation and cylinder
- 3600 ROP is maximum
ANBULL Bicycle Motorized 49CC 4 Stroke Gas Petrol Bike Engine Motor Kit
ebay.com The ANBULL Motorized Bicycle kit has both 28 to 40 mm frame tubes. You will not get the installation, but this is recommended for professionals. This is a 4 stroke engine and has received decent ratings from purchasers. Also, the manufacturer claims the engine sound is quieter than other versions of four strokes. This one may provide a decent alternative when deciding to upgrade from a regular bicycle to a motorized one. With this system, you can enhance your riding experiences.
Features of this engine:
- This engine is for adults and not for minors.
- It has 26 inches frame and with 4 stroke engines which makes it a reliable and stable option
- The top speed is 27 to 32 mph
- The tank holds two liters of gasoline and other things available in the kit.
MOTOOS 49CC 4 Stroke Motorized Cycle Engine Motor Kit
MOTOOS 49CC 4 Stroke Motorized Cycle Engine Motor Kit Compatible with Normal 28" V Frame Bike and 26" ATV Bike Bicycle Full Set
The MOTOOS 49cc kit is a pull start kit and a quieter and reliable product than the other items. You’ll get everything in the package, just oil is missing from the kit. You can always stop and start the engine whenever you wish, and it should run perfectly on the first go, and you will not require any kind of adjustments. You’ll get an in-line and tank gas filter in the kit. You will also get a faster delivery once you order it and the engine will run speedily according to customer reviews.
Features of the engine:
- The capacity is 0.77L
- The speed is 27 to 32 mph
- There is an ignition of transistor magneto
- It has air cooling, one cylinder.
- The oil capacity is 0.25L
Flying Horse Complete 5G 4-Stroke Bicycle Engine Transmission Kit
The Flying Horse Complete 5G 4-Stroke Bicycle Engine Transmission Kit is compatible with almost all Huasheng 142F 4-Stroke Engine kits, Grubee 4-stroke kits & of course the Flying Horse 5G engine kit. This product will allow you to either rebuild your 4 stroke motorize bike or give you a chance to make use of a 4 stroke engine that’s been on the shelf. Some items you’ll get in the package include a wide crank assembly (no bottom bracket), a black chain guard & a 4 stroke mounting plate. You’ll also get a 44 tooth sprocket, a new transmission, chain idler, sprocket clamp assembly, and so on. Additionally, you’ll receive a four-stroke muffler and a throttle grip as well as a killswitch set. This is a decent choice for professionals and new users alike. Novices can check the manual for the installation and once it’s complete, you’ll have a functioning 4 stroke motorized bike.
Features of this transmission kit:.
- 415 Heavy Duty Chain
- Chain Idler w/ Bearing Wheel
- Black Chain Guard
Conclusion
The 4 stroke system has a universal fit and once you replace the old one with the new one, you’re ready to hit the road with your motorized bike. You’ll get a heavy-duty chain with a mounting plate which will help you install the motor easily. You can easily choose from this list of 4 stroke bicycle engine packages, and you’ll find the one you need for your bike. Make sure to compare the prices of the kits and then go for the one that suits your needs best.
You may be interested
HuaSheng 38cc with Centrifugal Clutch Engine
The two main types of bicycle engines are 2-stroke and 4-stroke. 2-stroke engines are simpler than 4-stroke engines and 2-strokes usually require more maintenance. 2-stroke bicycle engines are more visually appealing compared to 4 stroke engines. They’ve also been around since the 19th century (31 December, 1879), as have 4 stroke engines however slightly earlier.
2 Stroke Engines
A 2-stroke engine is an engine that completes two strokes, or power cycles, for every cycle of the crankshaft. In other words, for every time the crankshaft turns once, a 2-stroke engine will complete one power stroke. This is why 2-stroke engines are also known as “two-cycle” engines.
The 2-stroke engine gets its power by mixing fuel and air in the crankcase and then igniting it. The piston compresses both fuel & air while the spark plug ignites it, causing the piston to move down and the crankshaft to turn. As the piston moves up, it draws in new fuel and air charge, and the process starts over.
2-stroke engines are simpler than 4-stroke engines because they don’t have valves or camshafts. This also makes them lighter and less expensive to build. 2-strokes usually require more maintenance, however, because the engine oil is mixed with the fuel and burned. This can cause the oil to thin out and not lubricate the engine adequately.
4 Stroke Engines
A 4-stroke engine completes four strokes for every crankshaft cycle. In other words, for every time the crankshaft turns once, a 4-stroke engine will complete four strokes. This is why 4-stroke engines are also known as “four-cycle” engines.
4-stroke engines are more complicated than 2-stroke engines yet they usually require less maintenance. 4-stroke engines make up nearly 60 percent of motorcycles on the road today. 4-stroke engines were first developed in the late 1800s, but they didn’t start to become popular until the early 1900s.
4-stroke engines get their power by compressing the air/fuel mixture in the cylinders and then igniting it with a spark plug. The spark plug fires once for every two crankshaft revolutions, so there are two sparks per cycle. 2 strokes are needed to complete the intake and exhaust phases, while 2 more strokes are needed for the combustion and power phase.
The 4-stroke engine differs from 2 stroke engines in several ways. For example, 2 stroke engines use ports, whereas 4 stroke engines use valves. 2-stroke engines mix the fuel and oil, while 4-stroke engines have an oil reservoir. 2-stroke engines are also noisier than 4-stroke engines.
