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(Discontinued) 4 Stroke Pull Start Grubee SkyHawk 49cc Bicycle Engine Kits EPA Item# GI-EEKB-4S

OUR PRICE: $314.96
List Price: $599.95

The latest addition to our popular line of bicycle engine kits is the 4 stroke bicycle engine kits with all of the latest features and upgraded components. The all new 4 stroke bicycle engine kit features a centrifugal clutch and pull start enhancements. This 4 stroke bicycle engine kit is truly the cream of the crop of bicycle engine kit industry. With this 4 stroke engine, there is no need to mix the oil and fuel like the 2 stroke engines. Instead, this engine features an independent oil reservoir which keeps the engine well lubricated. Due to this, the 4 stroke engines are know for  their reliability and long life. Also, with the centrifugal clutch feature, there is no need to engage and disengage the engine manually. Similar to an automatic transmission in a car, you simply pull the throttle to go! Then at a standstill, the engine will automatically disengage so that the engine will stay running at a stop.

This kit comes with every thing that you'll need to convert bicycle into a motorized bike. You will still be able to pedal the bike and ride like normal. You can stop or start the engine as you ride. Don't be fooled by other retailers, selling outdated, non-EPA approved, old generation engines! All of our engines feature the latest updates, including high quality needle bearings and Japanese ball bearings. Older generation engines use cheap bushings that do not last! We make certain that all of our manufactures 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! 

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

  • 4 - 5 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

49cc engine kit is about 9" height 9.5" length 7" width. Kit fits on standard 25mm to 29mm frame tube. Larger frame size requires drilling into bike frame and use the universal face plate. Ensure proper fit by reviewing the minimum dimension requirements diagram on the right. 


Note: The 4-Stroke Pull Start Engine is wider than our standard 2-stroke engines. As such, depending on your bicycle, it may require the use of the extra wide crank assembly included in the kit.


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 or this kit or any warranty after installation.



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

Package includes

  • 1. 2010 49cc 4-Stroke Centrifugal Clutch/Pull Start EPA Approved Belt Drive Transmission Engine
  • 2. High Performance Low Profile Carburetor
  • 3. Upgraded Hush Muffler 
  • 4. Drive Chain Idler
  • 5. High Quality Japanese Main Bearings 
  • 6. 415 Bike Chain 
  • 7. Upgraded Chain Tension Guide with Bearing Wheel 
  • 8. Chain Guard 
  • 9. Spark Plug 
  • 10. CD Ignition Coil 
  • 11. Upgraded Twist Throttle and cable with matching grip 
  • 12. Engine Mounting Base
  • 13. Black Teardrop Gas Tank (2L)
  • 14. Fuel Line
  • 15. Throttle Cable
  • 16. Gasoline Tank Switch
  • 17. Sprocket Clamp Assembly
  • 18. Sprocket Clamp Bolts
  • 19. High Quality Needle Bearings on Both Ends Crank
  • 20. 44 Tooth Chrome Sprocket with 9 Holes
  • 21. Magneto
  • 22. Kill Switch 
  • 23. Bonus: Spark Plug Removal Tool
  • 24. All the Needed Mounting Brackets, Gaskets, and Hardware

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


Disclaimer: Operating a bike, motorized bicycle or bike with a bicycle engine kit installed involved some risk of serious bodily injury. Buyer accepts responsibility for any and all vehicle operations 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. Seller is not responsible for misuse of this kit or any warranty after installation. Not all motorized bicycles are allowed on road use. We make no guarantee as to the road legality of the bicycle engine kits. The risks that the Seller, Niche Webstores, Inc is not responsible for include among other things: falling, collisions with pedestrians, street, highway or roadway vehicles, striking obstructions or other person, unsafe weather conditions including temperature exposure (hypothermia, sunstroke, sunburn, heat exhaustion and dehydration.


Download Instruction Manual



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