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FJNMKB Upgraded 80cc Bicycle Engine Kit – Convert Your Bike into a Motorized Bicycle




Take your cycling experience to the next level with the FJNMKB Upgraded 80cc Bicycle Engine Kit. This complete conversion kit allows you to turn your regular bicycle into a gas-powered motorized bike with ease.

Powerful 80cc Engine

At the heart of this kit is a high-performance 80cc 2-stroke engine. Generating up to 2.5 horsepower, this compact powerplant packs a punch, giving you an extra boost when tackling hills or headwinds. The 80cc displacement provides plenty of torque for cruising at higher speeds while still remaining fuel-efficient.

Safe and Reliable CDI Ignition

The engine features a CDI ignition system for smooth and consistent performance. CDI ignition works by using electronic components to control the timing and distribution of the spark rather than mechanical contact points. This makes it much more reliable at high rpm operation compared to traditional points ignition. You’ll enjoy quick starts, optimal combustion, and reduced maintenance.

Durable Aluminum Construction

Built to last, the 80cc engine uses die-cast aluminum for key components. Aluminum provides superior strength and heat dissipation compared to plastic, which is critical for the demands of engine operation. The aluminum cylinder and head are engineered to withstand years of use.

Universal Mounting

The FJNMKB engine kit is designed to work with most standard bicycle frames 26″ or larger. All the necessary mounting hardware and fasteners are included for an easy bolt-on installation. Detailed installation instructions walk you through the entire process step-by-step. The engine can be mounted either horizontally or vertically based on your preferences and frame design.

Reliable Fuel Delivery

An included fuel tank with switchable fuel valve and fuel filter provide consistent fuel flow to the carburetor. No need to pre-mix oil and gas – just fill up the tank and go. The large 1.5 liter capacity allows you to ride farther between fill-ups.

Smooth-Shifting Transmission

Power from the engine transfers to the rear wheel through an included 40:1 sprocket kit and #40 chain. The sprocket assembly comes pre-installed for quick mounting. It’s engineered for smooth and reliable shifting performance.

Advanced Ignition System

FJNMKB utilizes an advanced Capacitive Discharge Ignition (CDI) system for optimal sparking power. CDI produces a strong spark for quick starts while requiring less maintenance than contact point ignitions. You’ll enjoy consistent throttle response and engine performance – even at high rpm usage.

Improved Air Cooling

The cylinder and head are designed with integrated cooling fins to improve heat dissipation and prevent overheating. This allows the engine to run efficiently during extended use. The improved cooling also extends the operational life of components.

Easy Installation

Transforming your regular bike is simple with the included mounting hardware and detailed instructions. Typical install time is around 2 hours with common tools. FJNMKB provides world-class support if any issues come up. Enjoy the thrill and convenience of a motorized bicycle with minimal investment and effort.


  • Engine Displacement: 80cc
  • Ignition: CDI
  • Max Power: 2.5 hp
  • Bore x Stroke: 47mm x 49.5mm
  • Carburetor: 28mm
  • Starting Method: Recoil pull start
  • Fuel Type: Unleaded gasoline
  • Fuel Tank Capacity: 1.5L
  • Transmission: 40:1 sprocket
  • Net Weight: 15.4 lbs.

Experience the thrill of a motorized bicycle with the 80cc engine kit from FJNMKB. Convert your standard bike into a fast, economical cruiser. Order today and hit the road!


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