I love cycling. Yet, every now and then, I love the benefits of an electric bike. Getting an electric bike is simple but if besides cycling you also love mechanics, maybe you’d like to consider getting a 4 stroke bike engine kit to motorize your two wheels.
If you have no clue on why you should do that but fancy the idea, read through this guide. If you already know you want to do it, click on the links below to see which are the best 4 stroke bike engine kits on the market.
Transforming your traditional bike into a motorized vehicle is a load of fun. That is if you have a few mechanic skills. If you’re wondering why not invest in an e-bike from the start, the answer is simple. You already own a bike. By getting only an engine kit, you’ll be able to save a lot of money.
A thing to keep in mind before jumping into the process is to check the laws in your state and make sure that converting your bike into a motorized vehicle comply with the local regulations.
Why Should You Motorize Your Bike?
An electric bike is great for both leisure and commuting. When the distance is long or the slope too steep, you can simply switch to electric aid, reducing the pedaling effort and improving your performance.
In simple words, an electric bike can help you move faster with less effort. But this is not the only reason to motorize your bike. After all, you could invest in a bike that already comes with an engine, saving you the hassle.
Apart from the financial considerations, converting a bike to a motorized vehicle gives you more options in terms of bike features and performance. Moreover, you’ll also be able to choose between electric and gas engines.
As it is clear from the title, this guide is dedicated to the 4-stroke bike engine kits. Although gas engines are less green than electric engines, there are some advantages that made me consider them.
Looking at the dark side, putting an engine on the bike means increasing the weight of your vehicle. If you like pedaling uphill, you might hate the extra weight. But then, you’ll always be able to switch on that engine whenever you feel too tired.
Why Choose A 4 Stroke Bike Engine Kit
On the market, there are many types of bike engine kits. So, why choose a 4-stroke engine? Or why choosing gas in the first place?
To answer these questions, I’m going to start with the latter. If the gas bike engine kits are legal in your area, investing in one could mean a lower initial investment cost compared to the electric models. On the other hand, gas engines are more powerful than electric ones and they don’t need a battery. This usually means that they have a lower weight.
Of course, there are some disadvantages too. Gas engines generate more pollution, they are louder and are generally less discrete than electric engines.
Regarding the types of gas bike engine kits, there are two categories, 2-stroke and 4-stroke engines.
2-stroke engines are usually faster than the 4-stroke models, but they have a long list of disadvantages. They require more mechanical assistance, are louder than their 4-stroke counterparts and require the user to mix gas and oil.
A 4-stroke engine is usually controlled by valves that regulate the inflow and outflow of the fuel. In this way, 4-stroke engines produce more torque and are quieter compared to the 2-stroke engines. They also have a separate oil reservoir and you’ll not have to mix oil and gas anymore.
4-stroke engines also resist longer, produce fewer vibrations and are more comfortable during a ride.
How To Choose A 4 Stroke Bike Engine Kit
Best 4 Stroke Bike Engine Kit To Motorize Your Bike
1. 49cc Flying Horse 5G Pull Start Bicycle Engine Kit- 4 Stroke
If you’re an average rider, riding on mainly flat terrains, the Flying Horse 5G Pull Start Bicycle Engine Kit- 4 Stroke might be the right bike engine kit.
This kit contains a 49cc motor that features a centrifugal clutch and pull start enhancements designed to start the engine faster, compared to its older versions. This 4 stroke engine is easy to start with just a starter pull and a hit on the throttle.
The engine is also equipped with an automatic transmission, which is ideal for those looking for a reliable and easy to use kit. Moreover, you’ll also be able to forget about premixing oil and fuel thanks to the separate oil reservoir.
With this engine on, your bike will become similar to a scooter, with the advantage of being able to exercise or ride your bike without aid whenever you please.
2. Flying Horse 49cc 5G Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke
The 49cc 5G Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke by Flying Horse is a compact 4 stroke bike engine kit designed to fit on almost all bikes with standard tires. Moreover, this is a friction drive motor that mounts directly over the wheel and not on the frame.
There are many advantages in mounting the engine over the wheel rather than in the center of the frame. In fact, this engine is more discrete on the bike and it doesn’t really change its aesthetics.
Thanks to this feature, it is also easier to mount the engine on a wider range of bikes, including bikes that have non-standard frames.
Moreover, because the engine mounts over the wheel, you’ll not have to install a rear drive sprocket on the bike.
3. Flying Horse 38cc Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke
If you live in an area with flat terrain, then a 38cc 4 stroke engine might deliver enough power for your needs. In this case, an engine kit to consider is the Flying Horse 38cc Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke.
This 4 stroke bike engine kit is part of the Lock-N-Load friction drive kits manufactured by Flying Horse. One of the main advantages of the kit is that it mounts over the wheel and it is, therefore, compatible with a wide range of bikes.
In fact, the engine kit is suitable for bikes with non-standard frames, such as women’s bikes, touring or cruiser bikes. The engine is compact and designed to become a discrete presence on the bike. The gas tank is built right on the engine, minimizing the aesthetic impact.
Thanks to the over the wheel installation, the engine will also help you avoid installing a rear drive sprocket.
4. 49cc Flying Horse 5G 4-Stroke Bicycle Engine Assembly Motor + Carb + Exhaust
This 49cc Flying Horse 5G 4-Stroke Bicycle Engine Assembly Motor + Carb + Exhaust is not a complete 4 stroke bike engine kit. The package only contains the assembly motor, the carburetor, and the exhaust, but the transmission and other components are not included.
Nevertheless, this is a great replacement kit for a 49cc pull start bike engine kit if you only have to replace one of the listed components.
The components included in the purchase are also compatible with transmissions manufactured by other brands, as long as they comply with the Flying Horse’s specifications.
The engine uses a forced air displacement cooling system and its 49cc provide 10.2 KW of power. The motor can reach 15 mph in a blink of an eye and it has a great performance on hilly terrains.
5. GOWE 4-Stroke 49cc Gas Motorized Bike Engine Kit
GOWE 4-Stroke 49cc Gas Motorized Bike Engine Kit is a reliable 4 stroke bike engine kit to consider if you want to motorize your two wheels. This bike engine kit boasts a 49cc pull start engine that is easy to mount on the frame.
The motor is reliable, quiet, and durable. It reaches a top speed between 27 and 32 mph, depending on the characteristic of the terrain and rider’s weight, while the gas tank has a capacity of 2 liters.
This bike engine kit contains everything needed for mounting and installation, including universal brackets and other required hardware. It is suitable for bikes with 26-inch frames or similar bikes, although it might not fit on models with non-standard frames.
The engine has a single bore & stroke cylinder and it is air cooled. Thanks to the torque, displacement, and compression ratio, this engine is designed to provide a superior performance when compared to similar models available on the market.
Conclusion & Final Pick
Choosing the best 4 stroke bike engine kit is often a hassle. You have to consider your weight, the terrain, and a bunch of other variables. Nonetheless, in my opinion, the 49cc 5G Lock-N-Load Friction Drive Bicycle Engine Kit- 4-Stroke by Flying Horse is the best.
This bike engine kit impresses with its characteristics. It contains a friction drive engine which is mounted over the rear wheel. In this way, it doesn’t occupy the space on the bike’s frame, which is a great advantage. Moreover, the engine has a capacity of 49cc and it can reach a speed of 15 mph even on hilly terrains.
All this, together with the fact that it has a minimal impact on the aesthetics of the bike, make me consider it one of the bests on the market. What do you think? Is this a 4 stroke bike engine kit you would consider?