7 Best Gas Motor Kits for 3 Wheel Bicycle (Researched and Compared)

After researching dozens of gas motor kits designed for three-wheel bicycles, we compared manufacturer specifications, safety standards, and aggregated owner feedback to identify the top options. Our evaluation focuses on power output, ease of installation, frame compatibility, and real-world reliability. Whether you need a kit for a cargo trike, a recumbent trike, or a standard adult tricycle, this guide will help you choose wisely.

1. Bicycle-Engine 80cc 2-Stroke Gas Motor Kit: Best Overall

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In our evaluation, the Bicycle-Engine 80cc kit stands out for its robust power delivery and reliability on three-wheel bicycles. Owner feedback consistently praises its ability to handle cargo loads and hill climbs without bogging down. The kit includes a heavy-duty mounting bracket that fits wider trike frames, and the carburetor is pre-tuned for easy starting.

However, the 2-stroke design means you must mix oil and gas, which some users find inconvenient. The vibration levels are higher than 4-stroke alternatives, which may be uncomfortable on longer rides. This kit is not ideal for riders seeking a smoother, quieter experience or those unwilling to mix fuel.

• Strong 80cc engine provides ample torque for heavy trikes
• Includes all necessary mounting hardware and throttle assembly
• Compatible with most adult tricycle frames with 26-28 inch wheels

Pros: Excellent power-to-weight ratio; Comprehensive installation kit
Cons: 2-stroke engine requires mixing oil with fuel

2. Grubee Skyhawk 66cc 2-Stroke Gas Motor Kit: Runner Up

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The Grubee Skyhawk 66cc kit is a close second in our comparison, offering a refined 2-stroke experience with better vibration damping than many competitors. Owner feedback highlights its easy starting and consistent performance on flat terrain. The mounting plate is thicker than average, reducing flex on trike frames.

However, the 66cc engine delivers slightly less torque than 80cc options, which can be a limitation for heavy trikes or steep inclines. Some users reported the supplied chain tensioner worked loose over time, requiring periodic adjustment. This kit is best for riders on moderate terrain who prioritize smoothness over raw power.

• Reliable Skyhawk engine with improved cylinder porting
• Heavy-duty steel mounting plate for stability
• Upgraded spark plug and CDI for consistent ignition

Pros: Smooth power band; Durable mounting hardware
Cons: Smaller displacement may struggle on steep hills with heavy loads

3. Zeda Firestorm 80cc 2-Stroke Gas Motor Kit: Best Power

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For riders who need maximum power, the Zeda Firestorm 80cc kit delivers the strongest performance in our evaluation. Owner feedback notes that it easily propels heavy trikes up hills and reaches higher top speeds. The CNC intake and performance exhaust are genuine upgrades over standard kits.

However, the added power comes with trade-offs: vibration is more pronounced, and the engine is louder. Some owners reported that the mounting bolts need to be checked frequently due to vibration loosening. This kit is not recommended for beginners or those who prioritize a quiet, smooth ride.

• High-performance cylinder and piston for extra power
• CNC-machined intake manifold for better airflow
• Includes a performance exhaust for increased torque

Pros: Highest power output in its class; Upgraded components for reliability
Cons: More aggressive vibration at high RPM; Installation requires some mechanical skill

4. Bikemaster 49cc 4-Stroke Gas Motor Kit: Quietest Operation

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The Bikemaster 49cc 4-stroke kit is a standout for those who value quiet operation and convenience. In our research, owner feedback consistently mentions how much quieter it is than 2-stroke kits, making it suitable for neighborhoods with noise restrictions. The automatic clutch eliminates the need for a manual throttle cable setup, simplifying installation.

However, the 49cc engine produces only modest power, which may not be sufficient for heavy trikes or frequent hill climbing. Some owners reported that the engine struggles on inclines above 10% grade. This kit is best for flat terrain riders who prioritize low noise and ease of use over speed.

• 4-stroke engine runs on gasoline only, no oil mixing
• Very quiet exhaust and low vibration
• Automatic centrifugal clutch for easy operation

Pros: Fuel efficient and clean; Simple maintenance
Cons: Lower power output may struggle on hills

5. Happy Time 66cc 2-Stroke Gas Motor Kit: Budget Friendly

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The Happy Time 66cc kit is the most budget-friendly option in our comparison. Owner feedback indicates that it provides adequate power for casual riding on flat roads. The kit includes all essential parts, and many users found it a good entry point for motorizing a trike.

However, durability is a concern: several owners reported that the included spark plug and carburetor failed within the first few months. The mounting hardware is thinner, and the engine may vibrate more. This kit is suitable for those on a tight budget who are willing to perform minor upgrades and adjustments.

• Lowest price among major kits
• Basic components suitable for light use
• Compatible with most standard bicycle frames

Pros: Very affordable; Decent performance for the price
Cons: Lower build quality; some parts may need replacement

6. Stark Motor 80cc 2-Stroke Gas Motor Kit: Easy Install

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The Stark Motor 80cc kit earns high marks for ease of installation based on owner feedback. The engine comes partially assembled, and the instructions are more detailed than most. The quick-release fuel line is a thoughtful touch that makes maintenance easier.

However, some users noted that the chain alignment was off on certain trike frames, requiring additional spacers or adjustments. The durability of the supplied chain and sprocket is average. This kit is ideal for first-time installers who want a straightforward setup, but may need to fine-tune alignment.

• Pre-assembled engine and mounting bracket
• Clear, illustrated instructions included
• Quick-release fuel line and throttle assembly

Pros: Simplest installation process; Good power for the size
Cons: Some owners reported chain alignment issues

7. MotoTec 49cc 4-Stroke Gas Motor Kit: Eco Friendly

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The MotoTec 49cc 4-stroke kit is a niche option for eco-conscious riders. In our evaluation, it produces the least power of any kit we researched, making it suitable only for flat, paved surfaces. Owner feedback indicates it works well on lightweight trikes but fails to provide adequate torque for cargo or hill climbing.

Additionally, the fuel tank design can be problematic on trikes with a rear basket or seat, as it may not fit without modification. This kit is only recommended for those with very specific low-power needs and flat terrain.

• 4-stroke engine with low emissions
• Lightweight design reduces added weight on trike
• Includes a large fuel tank for longer range

Pros: Environmentally friendlier than 2-stroke; Very quiet operation
Cons: Low power; struggles on any incline; Fuel tank placement may interfere with some trike frames

Frequently Asked Questions

Can I install a gas motor kit on any 3 wheel bicycle?

Most gas motor kits are designed for standard bicycle frames, but three-wheeled bicycles (tricycles) often have wider frames, different bottom bracket spacing, and thicker tubing. We recommend measuring your frame’s down tube and seat tube diameters and checking the kit’s mounting bracket dimensions. Many kits require a round down tube; some trikes have oval or rectangular tubes that may need adapters.

What size engine is best for a 3 wheel bicycle?

For a typical adult tricycle, an 80cc 2-stroke engine provides the best balance of power and weight. It offers enough torque to move a heavier trike and climb moderate hills. A 66cc is sufficient for lighter trikes and flat terrain. Smaller 49cc 4-stroke engines are underpowered for most trikes except very lightweight models on flat ground.

Do I need to register or license a gas motorized tricycle?

Laws vary by state and country. In many US states, a gas motor kit that keeps the bicycle under a certain speed (often 20-30 mph) and engine displacement (often under 50cc) may be classified as a motorized bicycle and not require registration. However, some states have specific requirements for three-wheeled vehicles. Check your local motor vehicle laws before riding on public roads.

How difficult is it to install a gas motor kit on a trike?

Installation difficulty ranges from moderate to challenging. Most kits require basic mechanical skills: mounting the engine, attaching the chain, connecting the throttle and kill switch, and securing the fuel tank. On a trike, you may need to adjust the chain alignment more carefully due to the wider rear axle. Expect 2-4 hours for a first-time installation.

Are gas motor kits safe for three-wheeled bicycles?

Safety depends on proper installation and riding habits. Ensure all bolts are tightened and checked regularly, as vibration can loosen them. Use a chain guard to prevent clothing contact. Trikes have a lower center of gravity, which can improve stability, but they also have a wider turning radius. Always wear a helmet and follow traffic laws.

Our Verdict

After comparing specifications and owner feedback, the Bicycle-Engine 80cc 2-Stroke Gas Motor Kit earns our top recommendation for its strong power, reliable performance, and compatibility with most trike frames. For those who prefer a quieter, simpler setup, the Bikemaster 49cc 4-Stroke kit is a solid runner-up, but only if your terrain is flat and your trike is lightweight. Choose the Zeda Firestorm 80cc if maximum power is your priority, but be prepared for more vibration and noise.