66/80cc Mega Motors Bicycle Engine Kit- 2 Stroke

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Mega MotorsSKU: FH-MEK80

FREE SHIPPING to Continental US
FREE 6-Month Warranty

Color: Silver
Sale price $170.96 Regular price $189.95


Gasoline operated products are NOT compliant with Environmental Protection Agency ( E.P.A. ) or California Air Resources Board (C.A.R.B) for the use on/off Public roads. Upon purchase, the buyer agrees to use products for racing (closed-course competition) only and NOT for on/off public roads.

The Silver Mega Motors 66cc/80cc bicycle engine kit is perfect for beginner builders and riders. Don’t be fooled by the super low price, though- our Mega Motors bicycle engine kits have the best parts for beginners in the industry! All of our engines feature the latest updates to the standard clutch ball bearings. We make certain that all of our manufacturers abide by strict quality control assurance measures and use the highest quality material so that we can make certain that all of our customers get only the best!

This kit comes with everything that you'll need to convert your bicycle into a motorized bike- all you need are some basic, household tools. You will still be able to pedal the bike and ride like normal or start the engine by releasing the clutch lever- there's no rope pulling needed! Don't be fooled by other retailers, selling outdated, old generation engines! Whether you're a beginner, or you need an engine that won't hurt your wallet, our Mega Motors 66cc Bicycle Engine Kit is perfect for your next motorized bike build!

*Note: Universal Mounting Hardware is not included with the engine kit.

PLEASE NOTE: Top end assembly required for this engine kit.

** Please note: Sprocket Clamp Assemblies included with Mega Motors 2-Stroke 48cc and 66/80cc bike engine kits come with only 1x set of metal plates. Older production of these assemblies included 2x sets, but from testing and redesigning, existing engine kits and engine kits in the future will only require 1x set. This redesigned assembly helps secure your rear wheel sprocket better than in the previous production.

With these strict quality assurance measures, we are able to offer a industry leading 6 month warranty!

2.75 HP (horse power)

25 to 40 mph depending on the gear ratio and weight

MPG 100-150 miles per gallon

Independent drive sprocket and chain does not interfere with your current drive chain and peddling

Product Dimensions

80cc engine kit is about 8.5" height 7" length 5" width. Kit fits on standard 25mm to 29mm frame tube. Larger frame size requires drilling into bike frame and use the universal faceplate. Ensure proper fit by reviewing the minimum dimension requirements diagram on the right.

CNS Carburetor upgrades will require extra material to fit flush around the manifold. This can be remedied by wrapping the manifold with electric tape or using PVC to fill in the gap between the carburetor port and the manifold.

Product Requirements

For installing this kit buyer may need some basic hardware skills, tools, and take around 2-3 hours to install and do some adjustments. Seller is not responsible for misuse of this kit or any warranty after installation.


Complete Digital Installation Guide

Each Mega Motors bicycle engine kit comes with an easy-to-follow installation guide that takes you step by step through installing, adjusting, and fueling your brand new engine kit for the ride of your life.



Industry Leading 6 Month Warranty against manufacture defects. We cannot warranty issues caused by user neglect or improper use of engine.


Package includes:

1. Silver Mega Motors 80cc 2-Stroke Engine

2. Low Profile Carburetor

3. Upgraded Hush Muffler (Color may vary depending on availability)

4. Clutch Cable

5. Drive Chain Idler

6. High Quality Main Bearings

7. 415 Engine Drive Chain

8. Upgraded Chain Tension Guide with Bearing Wheel

9. Chain Guard

10. Spark Plug

11. CD Ignition Coil

12. Upgraded Alloy Push Clutch Lever

13. Upgraded Twist Throttle and Cable With Grip

14. Black Teardrop Gas Tank (1.5L)

15. Fuel Line

16. Throttle Cable

17. Clutch Cable

18. Gasoline Tank Switch

19. Sprocket Clamp Assembly

20. Sprocket Clamp Bolts

21. Large Spring (Heat Shield Spring)

22. Extension Spring (Recoil Spring)

23. 44 Tooth Chrome Sprocket with 9 Holes

24. Magneto

25. Kill Switch

26. All the Needed Mounting Brackets, Gaskets, and Hardware

27. Complete Digital Installation Guide

28. Bonus: Standard Universal Mounting Bracket

Fits Most 26" Wheel Bikes (Mountain, Cruiser, Chopper, Road) with V-frame.

Disclaimer: Operating this motorized bicycle and bicycle engine kit involved some risk of serious bodily injury. Buyer accepts responsibility for any and all vehicle operation that may lead to personal injury, economic loss, social distress, other losses, costs and damages. Seller is not responsible for injuries and/or damages resulting from operating this motorized bicycle or bicycle engine kit. Upon purchase, the buyer agrees to use products for racing (closed-course competition) only and not for on/off public roads.

Disclosure of accurate engine size: While we have chosen to use the long standing factory branding engine size of "80cc", the true displacement of the bicycle engine is 66cc. Down through the years China bicycle engine manufactures have advertised their biggest engine as 80cc, therefore we have listed them in the same way on our website. However, the bore and stroke of an 80cc being 47x38mm equals 66cc. Therefore the true displacement of the 80cc bike motor is 66cc. In the west, the volume of a cylinder is calculated by using the formula Volume = Pi x Radius Squared x Stroke. However,in the east the displacement of an engine includes the area of the cylinder head's combustion chamber as well as the volume of the cylinder. As such, there lies a discrepancy between measuring standards by the manufactures in China with those in the United States. As such, all "80cc" engine kits on the market today are actually 66cc in displacement size if measuring by US standards.

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Customer Reviews

Based on 68 reviews
Jesse Callihan
Double trouble!

Overall I'm satisfied with my Springer front end and my mega motor for the most part I would like more information on specs on that motor and I am so far not been able to locate anything the port sizes The strokes pores anything about it but I'm happy overall so I am posting the video of both of them in action . FAH-Q 1 and 2

Cj Wyant
BBR 66cc/80cc motor

I am happy and very well pleased with the motor and the time I got it. Thank you guys!!!

Denise Higgins
A gift for my husband

He hasn’t assembled it yet. But he loves it. I will review again when he gets it on a bike.

Samantha Kennedy

Love it

Mohammed Nasser

66/80cc Mega Motors Bicycle Engine Kit- 2 Stroke

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