Best 2-Stroke Motorized Bicycle Engine Kits: 5 Real Picks Compared
Five real 2-stroke motorized bicycle engine kits compared on price, displacement, cooling, and buyer track record before you convert your bike.
In this article
- Who this guide is for
- Comparison table
- The picks, reviewed
- JAYGOVAN 80cc Bicycle Engine Kit -- Best Budget Pick
- IMAYCC 80cc Motorized Bike Kit (Silver) -- Most Reviewed / Most Trusted
- Knwigoe 80cc Bicycle Engine Kit with Digital Computer -- Best with Digital Speedometer
- H-YEEU 100cc Bicycle Motorized Gasoline Engine Kit -- Best 100cc Upgrade
- YUNLAIGOTOP 100cc Bicycle Engine Kit with Air-Cooling -- Best Air-Cooled Value
- How we chose these kits
- Final verdict
Who this guide is for
If you're looking to turn a standard bicycle into a gas-powered ride -- for a cheap commute, a farm or property vehicle, or just a weekend project -- a bolt-on 2-stroke engine kit is the fastest way to get there without buying a full moped. This guide compares five real kits currently sold on Amazon so you can match displacement, price, and included hardware to your bike and your budget, without digging through dozens of conflicting listings yourself.
These kits are aftermarket parts, not finished vehicles: expect to spend an afternoon with hand tools, and check your state and local laws on motorized bicycle registration and helmet requirements before you ride on public roads.
Comparison table
| Photo | Kit | Price | Rating | Reviews | Link |
|---|---|---|---|---|---|
 | JAYGOVAN 80cc Bicycle Engine Kit | $66.99 | 4.1 / 5 | 18 | Check Price |
 | IMAYCC 80cc Motorized Bike Kit (Silver) | $154.99 | 3.8 / 5 | 967 | Check Price |
 | Knwigoe 80cc Bicycle Engine Kit with Digital Computer | $86.99 | 3.8 / 5 | 24 | Check Price |
 | H-YEEU 100cc Bicycle Motorized Gasoline Engine Kit | $124.99 | 4.0 / 5 | 18 | Check Price |
 | YUNLAIGOTOP 100cc Bicycle Engine Kit with Air-Cooling | $82.99 | 4.1 / 5 | 34 | Check Price |
The picks, reviewed
JAYGOVAN 80cc Bicycle Engine Kit -- Best Budget Pick
Pros:
- Lowest price of the group for a full 80cc conversion set
- Includes the complete refit kit rather than just the bare motor
- Simple single-cylinder air-cooled design that's easy to service
Cons:
- Fewer reviews on file than the bigger-name kits
- No digital dashboard or speedometer included
- Instructions are thin -- plan on watching install videos
Who should skip it: Skip this one if you want a plug-and-play kit with hand-holding instructions or a built-in speedometer -- you'll be doing more of the fitting work yourself.
IMAYCC 80cc Motorized Bike Kit (Silver) -- Most Reviewed / Most Trusted
Pros:
- By far the largest review count of any kit on this list, so fit and failure patterns are well documented
- Fits standard 26-28 inch bike frames without major modification
- Conversion kit includes the hardware most riders ask for separately
Cons:
- Costs more than twice as much as the budget pick
- Average rating sits in the high-3s, so read the 1-star reviews before buying
- Still a 2-stroke, so you'll need to mix oil and gas correctly
Who should skip it: Skip it if budget is your main constraint -- you're paying a premium mostly for the larger track record, not for a mechanically different engine.
Knwigoe 80cc Bicycle Engine Kit with Digital Computer -- Best with Digital Speedometer
Pros:
- Only kit here that bundles a digital computer/speedometer as standard
- Mid-pack price for the added instrumentation
- Fits the common 26-28 inch bike sizes
Cons:
- Small review sample size so far
- Digital display is an extra component that can fail independently of the engine
- 3.8 rating means some buyers had installation or reliability issues
Who should skip it: Skip it if you don't care about a built-in speed readout -- you can add an aftermarket cycle computer to a cheaper kit for less.
H-YEEU 100cc Bicycle Motorized Gasoline Engine Kit -- Best 100cc Upgrade
Pros:
- Bigger 100cc displacement than the 80cc kits, for more low-end torque
- Marked '50+ bought in past month' at time of research, suggesting steady demand
- Solid 4.0 average rating
Cons:
- Review count is still on the lower side
- More displacement means more vibration and a heavier motor to mount
- Not legal as a street conversion in every state -- check local law before buying
Who should skip it: Skip it if your frame or local regulations are only rated for smaller 50-80cc conversions.
YUNLAIGOTOP 100cc Bicycle Engine Kit with Air-Cooling -- Best Air-Cooled Value
Pros:
- Highest rating of the 100cc options at 4.1 stars
- Priced closer to the 80cc kits despite the larger displacement
- Upgraded air-cooling fins help on longer rides
Cons:
- Still a modest review count relative to the IMAYCC kit
- 'Upgraded' cooling is still passive air-cooling, not liquid-cooling
- Fit reports vary by frame brand -- measure your bottom bracket before ordering
Who should skip it: Skip it if you're set on the single most battle-tested kit on the market -- that's still the higher-volume IMAYCC listing, just at a higher price.
How we chose these kits
We started from real Amazon search results for motorized bicycle engine kits sold to US buyers, then narrowed the list to kits that: ship as a documented ASIN with a real price and rating (no unverifiable no-name clones), cover a spread of displacements (80cc and 100cc) and price points, and have enough of a review history to judge real-world reliability rather than just marketing copy. We deliberately mixed a budget option, the most-reviewed option, a digital-instrumentation option, and two 100cc upgrades so riders with different priorities -- price, proven reliability, extra features, or more power -- have a genuine choice rather than five near-identical listings.
Displacement (cc) roughly tracks torque and top-end power: 80cc kits are lighter and easier to mount on a standard frame, while 100cc kits pull harder but add vibration and weight. Cooling matters too -- every kit here is air-cooled, so longer sustained runs in hot weather will heat-soak the cylinder faster than a liquid-cooled motor would.
Final verdict
For most riders converting a first bike, the JAYGOVAN 80cc kit is the easiest entry point on price alone, while the IMAYCC 80cc kit is the safer bet if you want the deepest pool of buyer feedback behind your purchase. Riders who want more pulling power should look at the H-YEEU or YUNLAIGOTOP 100cc kits, and anyone who wants a built-in speed readout should start with the Knwigoe kit. Whichever you choose, budget separately for 2-stroke oil, a spare spark plug, and basic hand tools -- none of that is included in the box.
Frequently asked questions
Is a 2-stroke bicycle engine kit legal to ride on the road?
It depends on your state and even your city. Many US states classify a motorized bicycle as a moped or motor-driven cycle once an engine is added, which can trigger registration, licensing, or helmet requirements. Check your state DMV rules before riding on public streets.
What size engine kit should I buy, 80cc or 100cc?
80cc kits are lighter, easier to mount on a standard bike frame, and plenty for flat commuting. 100cc kits add more low-end torque for hills or heavier riders but add extra weight and vibration to the frame, so make sure your bike is rated to handle it.
Do these kits work with any bicycle?
Most kits are designed for standard 26-28 inch diamond-frame bicycles with room in the frame triangle for the engine mount. Cruiser frames, full-suspension mountain bikes, and step-through frames often need extra brackets or don't fit at all, so measure your frame before ordering.
What else do I need to buy besides the engine kit?
Budget for 2-stroke oil to mix with gasoline, a spare spark plug, basic wrenches and a torque wrench, and thread-locking compound for vibration-prone bolts. A helmet and any state-required registration or lighting equipment may also be mandatory depending on where you ride.
How long does installation typically take?
Most reviewers report a first install taking three to six hours for someone reasonably comfortable with basic mechanical work, longer if it's your first time. Watching a full install video for your specific kit before starting saves the most time.
