50cc Complete Gas Powered Engine Kit (Honda)

$499.99

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50cc Complete Honda 4-Stroke Kit
(Includes Honda GHX50 Engine)

For a limited time get FREE SHIPPING on all web site orders of $100 or more. Enter coupon code FREESHIP during checkout.

*Offer valid for standard ground shipping on orders in the Continental US only.

Kit Includes:

4 cycle 50cc 2.5 hp Honda engine
Patented stage III gear box with engager
11 tooth drive sprocket with freewheel
1 piece wide crank
56 tooth 9 hole chrome sprocket
2.5L fuel tank
Chrome FlowRight muffler
Push button engager lever
Twist throttle & cable with kill switch
Heavy duty chain
Chain tensioner
Chain guard
All the mounting brackets, gaskets, and hardware.
Complete users manual / installation instructions.
6 month limited warranty.

New Honda 4 Cycle Bicycle Engine Kits
49cc 4-stroke bike motor kit

Easily Convert Your V-Frame Bicycle!

Engine Specifications:
Engine Type	Air-cooled 4-Stroke OHV Single Cylinder
Bore x Stroke	41.8 x 36 mm (1.65 x 1.42 in)
Displacement	49 cm3 (2.99 cu in)
Compression Ratio	8.0 : 1
Net Horse Power Output*	1.6kW (2.1hp) at 7,000 rpm
Net Torque	2.7 Nm (2.0 lbs ft) at 4,500 rpm
PTO Shaft Rotation	Counterclockwise (from PTO shaft side)
Ignition System	Transistorized megneto ignition
Starting System	Recoil Starter
Carburetor	Float Type
Lubrication System	Forced Splash
Governor System	Centrifugal Mechanical
Air Cleaner	Semi-dry Type
Oil Capacity	0.25l *0.26 US qt, 0.22 Imp qt)
Fuel Tank Capacity (liter)	0.77l (o.81 US qt)
Dimensions (L x W x H)	225mm (8.9 in) x 274mm (10.8 in) x 353mm (13.9 in)
Dry Weight	5.5 kg (12.1 lbs)
* The power rating of the engine indicated in this document is the net power output tested on a production engine for the engine model and measured in accordance with SAE J1349 at 3600 rpm (7000 rpm for model GHX50). Mass production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending on numerous factors, including the operating speed of the engine in application, environmental conditions, maintenance and other variables. Performance Curve:

This kit is legal in almost all states. Most laws stipulate that any motorized vehicle 50cc and under is legal to operate without a license, registration, or insurance. You can find a kit with a larger engine, but you will be required to have a drivers license and you must license, register, and insure your scooter. Don't bother with the hassle--get the biggest engine available that doesn't require license, registration, and insurance!

Here are a few examples of this kit installed...

You can find many more examples in the customer bike gallery.

Click on an image for a larger view.

DISCLAIMER: Operating this motorized bicycle or bicycle engine kit involves some risk of 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. Birddog Distributing, Inc. is not responsible for injuries and/or damages resulting from operating this motorized bicycle or bicycle engine kit . This kit is not recommended for use by persons under 16 years of age. Obey all traffic regulations. Always wear a helmet while riding. Remember that you are riding a motorized bicycle and other traffic may not be able to see you. Never operate your motorized bicycle on a pedestrian through way or sidewalk while the engine is running. Never operate your motorized bicycle in an unsafe manner. Check local and state laws before riding on streets. Engines larger than 48cc are not legal to operate on the street.

Optional Upgrades:

Thumb Clutch And Brake

Mid Frame Kick Stand

Heavy Duty Axle Kit

Looking For Parts, Accessories, & Additional Upgrades?
We stock a full selection of replacement parts & accessories for the 4-stroke engine kit.

Latest Reviews

matt lantzy - 08/05/2009

I bought this kit for a custom application on a 26" stretch cruiser i picked -up last summer. The bike was already a fun bike to ride and a real "eye-catcher", but the bike had three gears and all were for speed!?-so the smallest hill took some effort to get-up. And then thats when it hit-me!! .... i'll just throw an engine in it! So i hit the net and found that most kits are 2-stroke and the look of the bike would be lost if it made that "high pitch" noise so i knew that a four -stroke motor would be the better fit for the project. Honda has never let me down in the past so the obvious choice was made there, and most four stroke motors give a better low end power so another no-brainer on that decision!. I knew by looking at the installation guide that this was not just going to be a simple install since the kit was made for a standard " V " shaped frame but.... a degree in engineering would not be needed:) So my order consisted of.... -1 complete (honda) 50cc engine-kit -1 1 gallon gas tank "because i RIDE!!" -1 inline fuel filter -1 fuel valve -1 1 lbs bag of weed "i wish!!" The order took a few days to arrive and arrive intact it did!. I did not start on it right away..... "you know the work thing". I started with the motor and first checked how the chain lined-up with the sprocket, it was good but the mounting bracket had to be welded because of the stretched frame, so the clamps for the frame were not used. I was able to utilize almost every other part in the kit so not much money wasted there. The total install took about a week, due to welding and multiple trips to the bike shop and home depot for all the "custom work". I took a few test runs and all went well except for a few chain malfunctions, mainly due to the stretch of the bike and the chains needing to be lengthened. My first real ride was a 20-30 mile loop and started with a two mile down hill ride and the chains were tested to the max there and went fine. Next was a 8 mile flat to small hill ride and the bike felt strong but i did not give it full-throttle just to give it some good break-in time,maybe riding at about 15-20mph. Next the ride consisted of some long medium hills so i was a little worried about the chain problems from earlier but the bike had no problems at all. Also noticed that you really use the engine as more of an assist rather than the main source of power. Meaning you still pedal but kick the motor on only when you need it. Next was the speed test at a stretch of road that your speed is noted by an electronic speed sign that tells you how fast your going and i was clocked at 44 mph!- and right about there i was satisfied with my work and my purchase!!...i completed the trip and i am still pumped on my new bike!! The gas mileage is great!! my tank was almost full after that ride. Its only been a few weeks and since then i've had a few people ask me to build one for them. I'm still trying to come up with a fair price but i honestly think 2-3k is not bad??. Cons- The installation manuel is poopy but don't worry you can figure it out. Well..... thats all i have to say about that! Also! THANK YOU - "BIG J " !!__the coolest tech guy out there!! !! thanks for all your time and help !!

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50cc Complete Gas Powered Engine Kit (Honda)

50cc Complete Honda 4-Stroke Kit (Includes Honda GHX50 Engine) For a limited time get FREE SHIPPING on all web site orders of $100 or more. Enter coupon code FREESHIP during checkout. *Offer valid for standard ground shipping on orders in the Continental US only.

50cc Complete Honda 4-Stroke Kit
(Includes Honda GHX50 Engine)

For a limited time get FREE SHIPPING on all web site orders of $100 or more. Enter coupon code FREESHIP during checkout.

*Offer valid for standard ground shipping on orders in the Continental US only.