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Bicycle engine kits and engine-powered bicycles have never been more popular.
Mounting an engine on your bike can give it a whole new lease on life. Whether you want to use it for a hilly commute, a long ride, or just for a bit of fun, they offer plenty of versatility.
The best bicycle engine kit for your bicycle and needs are likely to vary. However, we’ve compiled a list of nine engine kits, with hopefully at least one to match your bike, your needs, and of course your pocket.
Let’s get this review underway and see if we can help you find the best engine kit for you.
- Top 9 Best Bicycle Engine Kits To Buy In 2021 Reviews
- 1 Aw Front Wheel Electric Bicycle Motor Kit Powerful Motor E-Bike Conversion
- 2 Goplus Bicycle Motor Kit Bike Gasoline Motorized Gas Engine Bike Motor Kit (Silver)
- 3 Zeda 80 Complete 2 Stroke 80cc Bicycle Engine Kit
- 4 Kinbelle 80cc 2 Stroke Engine Motor Kit
- 5 80cc 2-Stroke Bicycle Gasoline Engine Motor Kit
- 6 Iglobalbuy Bicycle Engine Kit 2-Stroke Cycle Petrol Gas Motor Engine Kit
- 7 Seeutek PK80 80cc Bicycle Engine Kit 2-Stroke Gas Motorized Bike Motor Kit
- 8 66/80cc BBR Tuning Bullet Train Electric Start Engine Kit – Silver
- 9 Bicycle Motor Works – The Fire Fly Motorized Bike Kit
- Best Bicycle Engine Kit Buying Guide
- Which Is The Best Bicycle Engine Kit Of All?
Top 9 Best Bicycle Engine Kits To Buy In 2021 Reviews
1 Aw Front Wheel Electric Bicycle Motor Kit Powerful Motor E-Bike Conversion
This is a nice, tidy looking motor.
The electric motor is housed in the front wheel. It looks a little bulkier than a conventional 26” front wheel. However, at a glance, it’s hard to distinguish it from a standard one.
Installation is not too complex…
The motor requires you to simply change out your wheel before hooking up the controller, battery, and accessories. Installation isn’t too complicated, though you will need a little bit of practical experience and a few tools. Excellent instructions are included.
The kit weighs approximately 20lbs so it doesn’t add too much weight and make pedaling on the flat a chore. The good news with this design is that it allows you to pedal whilst simultaneously using the motor. They call it their Pedal Assistance System.
Applying your brakes to stop the motor makes a nice safety feature…
For any of you living in hilly areas, and needing a rest up those steep climbs, you can also operate the motor without pedaling. The motor is engaged by simply twisting the throttle.
To stop the motor you can either release your pressure on the twist grip or apply your brakes. The use of applying your brakes to stop the motor is a welcome safety feature.
Powerful little motor this…
The motor is capable of driving the bike to speeds of up to 35 mph on the flat. It has a power output of 1,000 watts. To put this into context, that’s about the same power as a professional cyclist will put out during his sprint for the line.
Blimey! That’s a lot of power and a lot of speed for a bicycle. Just make sure you’re wearing a helmet for your protection.
The main controlling unit and battery are housed on the downtube in a durable Oxford cloth bag. The LED display can be fitted to your handlebars and the display gives information on your speed, time, gears, and battery life.
It would be our favorite if it came with its own battery and charger…
The AW 26″x1.75″ Front Wheel Electric Bicycle Motor Kit doesn’t come with either a battery or charger. But don’t worry. They’re easy to source and won’t break the bank.
- Easy installation.
- Doesn’t unduly change the look or styling of the bike.
- Runs silently.
- Features Power Assistant Pedalling.
- Battery and charger are not included.
2 Goplus Bicycle Motor Kit Bike Gasoline Motorized Gas Engine Bike Motor Kit (Silver)
This is a budget-friendly and powerful bicycle engine.
The Goplus Bicycle Motor Kit has an 80cc two-stroke engine. The power rating is 6 HP. On the flat, you’ll be able to reach speeds of around 30 mph. Don’t worry about keeping track of your speed as the Goplus has a speedometer to keep you on the right side of the law.
It’s one of the best bicycle engine kits for large frame bikes…
The Goplus bicycle engine will fit most large-sized bicycles. It’s suitable for use on cruisers, road bikes, and hybrids. Any bike with a wheel size of 26” or above should be fine. In fact, attaching this kit to any bike with a reasonably large V frame should not be problematic.
The kit comes complete with everything you’ll need. The instructions are included but this isn’t the easiest of assemblies. A little bit of mechanical experience would go a long way to making this a smooth and painless installation.
The entire kit weighs just 24.7lbs, so pedaling on the flat when the motor is off should be a breeze. What’s more, when the engine is engaged, we were surprised at its low levels of noise and vibration. For an 80cc engine, this is surprisingly quiet.
We’re sure you’ll all agree that the cruisers of old were, and still are, beautiful looking bikes. What we really like about this bike engine is the shape and design of the gas tank. It’s so reminiscent of early cruiser conversions to motorcycles.
Highly competitive price point too…
The price point of this engine makes it one of the most popular kits available. It’s a great way to have some fun and get into a whole new way of cycling. With a Goplus bicycle engine kit fixed to your cruiser, you’re sure to add a bit of extra retro-cool to your setup.
- Powerful engine.
- 30mph speed.
- Fits most large V-shaped bicycles.
- Not the clearest instructions.
3 Zeda 80 Complete 2 Stroke 80cc Bicycle Engine Kit
This is a quick and very powerful engine.
The Zeda 80 Complete 2 Stroke engine kit sets itself apart from most of the engines with its sheer speed. It can get up to a top speed of 40mph, making it one of the most powerful bicycle engine kits on the market. Now that’s fast, so you need to buckle up with this one.
Choose your sprocket for your terrain…
You get the choice of either a 36 or a 44-tooth rear sprocket. Your choice is very much going to depend on the terrain in your area. If you live somewhere hilly, go for the 44-tooth rear sprocket. If you live somewhere flatter, and you want out and out speed, go for the 36-tooth sprocket.
Consider upgrading your brakes though…
Whichever gearing you go for, we’d recommend that you consider upgrading your existing brakes. The speed the engine is capable of, combined with its extra 30lbs in weight, is going to take a bit of stopping. You might want to think about putting on disc brakes if your bike is compatible.
The external parts of the engine look nicely finished. Better still, you can choose to have the engine finished in either black or silver. Since the gas tank is black and the muffler is silver, both choices work well.
The engine has a good quality anti-corrosive coating. The rest of the parts are made from good quality materials too. We can’t fault this one for quality.
An impressively economical ride…
Despite having a powerful engine it’s not particularly thirsty. We managed to get 100mph with some not-very-restrained riding. And, we think it would be easy to increase this quite significantly.
Another thing we like about this kit is that the instructions are clear and it’s easy to install. You can genuinely get this all fitted and ready to go in just three or four hours. You don’t need any specialized tools either.
- It can reach speeds of up to 40mph.
- Choice of engine colors.
- Easy to install.
- Replacement parts are hard to find.
4 Kinbelle 80cc 2 Stroke Engine Motor Kit
This is an affordable bicycle engine kit.
We like the external design of the engine on the Kinebelle. The bottom of the engine has a less rounded and more angular design. It gives the engine a more old-fashioned and industrial look. This works well when contrasted with the incredibly shiny and highly polished exhaust.
So, does it go as well as it looks?
It goes just fine. It’s not the fastest of the engines we’ve reviewed but we’re pleased to say that it is one of the quietest. It will still get you up to 30mph though, and it’s just nice to get there with a little less noise.
This is an air-cooled, two-stroke 80cc engine. All the parts are included in the kit. The only things you’ll need to buy are your gas and oil.
For an inexpensive piece of kit, we have no issues at all with the build quality. The engine and the components offer fair value and what’s more, replacement parts are easy to come by.
Terrible assembly instructions though…
The engine and kit are easy to assemble and bolt onto your frame. Though we’re happy with the ease of assembly, the instructions left a lot to be desired. They seem complicated and we ended up relying on online videos for instructions and to get the job done properly.
We think this affordable bicycle engine kit is great for the budget-conscious. Not only because of the low buying cost but also because of its economy. In quite vigorous use you can easily get well over 100 miles per gallon. Your pocket will thank you if you choose this one.
- Quiet engine.
- Nice aesthetics.
- The written instructions are unclear.
5 80cc 2-Stroke Bicycle Gasoline Engine Motor Kit
This is another nice-looking and affordable engine kit.
The great thing about this kit is that you can choose between a black or a silver engine. Furthermore, you can also go for an upgraded kit if you want to get a bit of extra power. And who wouldn’t want that?
Pay a small fee for a great upgrade…
By fitting the upgraded carburetor you can get 10% more power and 5% more fuel economy. Given the small price of the upgrade, this is a no-brainer for us. It has got us wondering though, what would happen if we bolted a mini turbo on to this thing?
That would be fun!
The Gizmo has a clutch and gear lever. Additionally, the engine can be stopped or started without having to stop the bicycle. The teardrop gas tank is also fitted with a kill lever. All useful features for a bicycle engine.
The design and parts of the ExGizmo look almost identical to the Kinbelle bicycle engine kit we’ve just reviewed. In terms of design and build quality of the parts, there’s very little between them. They also have about the same performance with the same nice, quiet engine.
The similarities don’t stop there either. The instructions are equally badly written. Perhaps these last two engines are twins?
If you upgrade the carburetor on this one… it’s better than the Kibnbelle…
If you’re unsure if you should buy the ExGizmo or the Kibnbelle we’d advise you to go with whatever the best deal is on the day. They’re both affordable and economical engines.
However, if you want that little bit of extra power, and don’t mind paying a small premium, go for the EzGizmo with the upgraded carburetor.
- Choice of 2 engine colors.
- Carburetor upgrade option.
- Complicated written instructions.
6 Iglobalbuy Bicycle Engine Kit 2-Stroke Cycle Petrol Gas Motor Engine Kit
This is a small but relatively powerful bicycle engine.
The 50cc engine has enough power to get you up to speeds of 38mph which is fast for a motorized bicycle. At these kinds of speeds, you need to be careful and use a helmet to be properly protected.
Ride safe and obey the laws guys and girls…
Depending on the traffic laws in your state or country you’ll need to take extra care once you’ve installed this engine. Since there’s no speedometer it wouldn’t be too difficult to pick up a speeding ticket in an urban environment.
The engine, muffler, and components are all black. This is one of the few bicycle engine kits that has gone forth with an all-black look. If you intend to recreate a vintage motorized cruiser this would be a good buy. The cool thing is, once installed on the right bike, this kit looks killer.
Perfect for V-shaped frames…
The kit is designed to fit most traditional kinds of V-shaped frames with the manufacturer thankfully providing some useful frame specifications.
Iglobalbuy recommends that your bike should have 9”-11” clearance between the bottom bracket and the top tube. They also recommend that the frame tubes should have a diameter of between 25mm to 29mm.
Easy assembly is its winning point…
Happily, this is one of the easier engines to install. The instructions are nice and clear and the online videos are also clear. This was undoubtedly one of the easiest kits to assemble. That’s a big plus and something we look for in the best bicycle engine kits.
But you will need to fork out for it…
This isn’t one of the cheapest bicycle engine kits. However, we think that the quality of the engine and the components, plus its strong reliability, perfectly justifies the higher price. If you’re after a fast and well-constructed kit, this one is hard to beat.
- Fast top speed of 38mph.
- Strong build and reliability.
- All black styling.
- Easy to install.
- Easy to follow instructions.
- Relatively high price.
7 Seeutek PK80 80cc Bicycle Engine Kit 2-Stroke Gas Motorized Bike Motor Kit
This is one of the most popular bicycle engine kits on the market.
Frankly, we liked the old version of this kit, but the improved and upgraded engine is undoubtedly better. Seeutek has changed all of their mounting bolts. They now use alloy bolts that are lighter, stronger and less likely to corrode.
They have also upgraded their previous model to include a speedometer. Since the Seeutek PK80 80cc Bicycle Engine Kit is capable of up to 35mph this is very welcomed and makes for an excellent addition.
Another thing we like about this kit is that it’s very economical. In fact, it’s probably the best bicycle engine kit for economy on our list. The Seeutek PK80 can deliver fuel economy between 100mpg – 150mpg.
There are plenty of bicycle engine kits capable of a 100mpg fuel economy. That’s a great figure for any engine. But, to get 150mpg from one of these kits is exceptional. No wonder they are so popular.
We recommend using the instructional video…
The installation is reasonably straightforward, it’s not the most difficult to fit, though it’s also not the easiest. The instructions aren’t over complicated, though we found the online instructional video to be much more useful.
The company claims that you can install this in 2-3 hours. That seems rather optimistic to us. Unless you’re a trained mechanic or an amateur with a heck of a lot of experience. More realistically we’d say you can expect to double this time.
- Powerful engine.
- Good reliability.
- Excellent economy.
- Speedometer included.
- High-quality use of alloy mounting bolts.
- May require an additional motor mount.
8 66/80cc BBR Tuning Bullet Train Electric Start Engine Kit – Silver
We like the cool styling of the BBR.
The BBR Tuning Bullet Train Electric Start Engine Kits have strong performance and build-quality credentials. They have their own distinctive design and set themselves apart with the matt silver finish on the engine.
Japanese-made = reliable…
BBR kits have been around for a long time and most people will associate the brand with smooth running, high performance, reliability and quality. A lot of the components used in the BBR engine are Japanese-made and manufactured to exacting standards. This is one of the reasons that they’re so reliable.
One of the highlights of this engine kit is the carburetor. The existing carburetor is good quality, but never the less, it’s still easy and inexpensive to switch out for a high-performance alternative.
You should, of course, be aware that it’ll be a large improvement over the standard engine’s power. If you’re happy with the 5 HP, and 30mph top speed, this is an upgrade you won’t have to make.
We love the dual-start component…
Another standout of the BBR Tuning Bullet Train Electric Start Engine Kit is the dual-start component. This works electronically with a push-start button. Additionally, it also has a pull-start alternative on the left side of the engine. This means you just hit the button or pull the rope and you’re ready to go.
Centrifugal clutch saves on maintenance…
saves A final advantage of this kit is that it uses a centrifugal clutch. This never has to be disengaged. It, therefore, makes riding easier and saves on maintenance.
Confident of their build quality and reliability, BBR offers a six-month guarantee. They also offer a lifetime guarantee for technical support. That’s a lot of peace of mind.
- Excellent build quality.
- Strong reliability.
- The carburetor can be upgraded.
- Centrifugal clutch.
- Lifetime technical support.
- The engine is a little bulky.
9 Bicycle Motor Works – The Fire Fly Motorized Bike Kit
This thing is stunning.
This is the only bicycle engine kit that also includes the bike. And what a bike it is. It looks amazing.
The bike is a 26” aluminum framed California Beach Cruiser. It has a metallic red and black frame, metallic red fenders, black spoked wheels with red rims and black tires. On its own, the bike is a thing of beauty, but together with the 66/80cc bicycle engine, it looks perfect.
There’s something to be said for buying it all in one…
The engine and the cruiser bike look like they belong together. And, of course, they do. They were designed together and consequently, this does have a lot of advantages over buying the engine only.
The whole build is easier than a lot of the other engines we’ve reviewed. Everything fits in to place perfectly. What’s more, once the job is finished the symmetry and aesthetics are altogether much more pleasing.
Easy to disassemble too…
More good news is that the engine is even easier to disassemble. So, if in the future you decide to use the bike without the engine, disassembling the engine is an easy process. It’s also easy to take off the engine for any servicing that might be required.
The engine has a 66/80cc capacity and can reach a top speed of 30mph. There are faster engines but since this is on a cruiser, who would want to go fast? It’s not exactly what cruisers are about, now is it?
Like the cruiser bike, the engine is built with some good quality components. The engine is durable and reliable. Additionally, spare parts are readily available and inexpensive.
The instructions for build and installation are easy to follow. They form part of their three shipments, which also includes the delivery of the bike and engine. All of these are delivered separately.
Obviously, assembly time will be longer since there’s a whole bike involved…
The build and installation time will take a little longer than some of the other bicycle engine kits as there is also the bike that will need assembling. Once the bike is assembled, the installation of the engine is quick. One of the quickest to install of all the engines actually.
Show me your ID, please…
Because this comes as a complete bike it is worth noting that you need to be over 18 to buy the Fire Fly Motorized Bike Kit. Be sure of the laws in your state or country before you purchase.
- Beautiful looking combination of beach cruiser and engine.
- Easy to build.
- Easy to service the engine.
- Strong, reliable engine.
- Bike and engine must be jointly purchased.
- You must be 18 to buy this product.
Best Bicycle Engine Kit Buying Guide
One glimpse of a bicycle fitted with an engine will have the police licking their pencils worldwide.
The laws on engine kits fitted to bicycles, both battery and gas, vary between state and country. It’s impossible to list them separately so you’ll just have to check what they are in your area, but do check.
Generally speaking, if you’re on private land you should be on the right side of the law. Once you get out onto public roads things get more complicated. Public roads are where you’re most likely to fall foul of the law.
Why Buy One?
There’s no doubt about it, motorized bikes have seen a resurgence in recent years. E-bikes have, to a large extent, lead the way as eco-friendly alternatives to other forms of transport. But gas-powered engines remain popular.
There are plenty of uses for motorized bikes. Commonly, they are used just for fun, out in the wild or on trails. Alternatively, they can be used on farms or ranches. They might be used in very hilly areas to help the rider up some difficult climbs.
They can extend the range of a daily commute or just make it a more comfortable ride. Alternatively, they might be used by an older rider wanting to keep up with his younger or fitter friends, a rider returning from injury, or a rider with a physical disability.
Battery Engine Kits
We only featured one battery engine kit on our list. However, this doesn’t reflect their current popularity. E-bikes battery engine kits are becoming more common by the day.
Great for stricter areas…
A big advantage with battery engines and e-bikes is the fact that they tend to be more law friendly. On the whole, legislators and the police tend to have a more favorable attitude towards battery-powered bicycles.
Though often they are restricted on public roads by maximum speed, usually 20kph, they are very likely to be legal to ride in your state or country. You will, of course, still need to check.
Lighter and easier to fit too…
Battery bicycle engines are also usually lighter and easier to fit than a gas engine equivalent. Additionally, they don’t outwardly change the look of your bike to any large degree. In our experience, some of the very latest battery-powered engines and e-bikes are almost indistinguishable from a standard bike.
Gas Engine Kits
Gas-powered engines will always have their place, which in large part is down to their style and history. Gas bicycle engine kits were first bolted onto cruiser bikes over a hundred years ago as a means of cheap and easy transportation.
Modern-day bicycle engine kits are frequently paired with a range of different bikes. However, the classic style of a cruiser and bike engine kit is enduring. Simply put, they look amazing together.
Far better range and flexibility…
Gas-powered engines are usually more powerful than a battery engine. Also, since they’re quick and easy to fill, they have a much greater range and flexibility. Both things worth considering if you’re unsure if to go for a battery or gas kit.
Another advantage with a gas-powered engine is that they’re easier to upgrade for more power. Changing out the carburetor can be an easy fix to increase the HP. We still fancy strapping a turbo on one though!
Installation will vary between engines and between bikes. Never the less, a battery-powered engine will almost always be easier to fit. It’s likely to need fewer tools too.
If you do fit a gas-powered bicycle engine yourself it should still be relatively simple. However, there are a few checks you need to make first.
The most important thing to check is the dimensions of your frame, the clearance, and tire size. One or all of these will have an impact on the potential fit of an engine kit.
All manufacturers are careful to specify what bikes are suitable for their kits but you need to read the specs carefully before you make any purchasing decisions.
Slow and steady wins the assembly race…
The engine kits will usually either come with written instructions or they will send them to you by email. However, by and large, there are better instructions available in the form of online videos. Personally, this would always be our first port of call before commencing the assembly.
Once you start the assembly just take your time. Don’t be rushed and don’t be put off by the maker’s estimated build times. These are often overly optimistic!
Got Everything You Need?
If you didn’t find what you were looking for here, do check our Best Electric Bike Conversion Kits review.
Then, for great accessories and products to have on hand while you’re getting your engine kit groove on, take a squizz at our reviews for the Best Rust Prevention Products, the Best Bike Locks, the Best Bike Tubes, the Best Flat Pedals, and the best Bike Trailers.
Looking for a new cruiser? Don’t miss our Best Cruiser Bikes review.
Ever tried an electric scooter? If not, check out our Best Electric Scooters for Adults review to see what all the fuss is about.