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GRUBEE SkyHawk GT5A 66cc Replacement Motor


Availability:In stock


Compatible with GT5A


This is a replacement GT5A 66cc Engine (Note this is ONLY the engine and not the entire kit, THE CDI AND CARB DO NOT COME WITH THIS ENGINE)


Our Skyhawk motorized bicycle engine kits are made to easily convert a standard bicycle into a gas-powered motorbike. Get around faster and save money by transforming almost any bike into a fuel efficient moped. You can get up to 60 km/h and get about 100 km per liter with our bicycle engine kits. This motorized kit can save you hundreds of dollars in gas and is a great alternative to pedaling your bike.


Features of the Grubee SkyHawk GT5A Engine


  • 2.75 HP Considered one of the most powerful engines in its class
  • Industry-leading engine considered by most as the best motors around

With the angle fire slant head motor, the spark plug is at a 45-degree angle instead of pointing straight up. This gives the engine some more compression and can add up to an extra 5 km/h to your engine.


GRUBEE SkyHawk GT5A Motorized Engine Includes


  • GRUBEE SkyHawk GT5A Brand 2-Cycle 66cc Slant Head Bike Engine (Note CDI and Carb are sold separately)
  • 2.75 HP
  • Standard Engine Finish
  • Friction Clutch; Pedal Start
  • Complete User Manual (Click here to download)

As per legal requirement, we need to accurately disclose and label the correct engine size to the customer. The long-standing factory branding of the 80cc bicycle engine isn’t accurate. The true displacement of the GT5 bicycle engine kit is actually 66cc. Volume is calculated by V= pi x Radius^2 x Stroke. In Canada, the volume of the cylinder is only used when calculating the engine displacement. 47mm bore x 38mm stroke is a 66cc engine. This is the largest motorized engine that exists. There is no such thing as an 80cc bicycle engine kit (This is only used as a marketing gimmick).


All of our bicycle motor kits are now equipped with a catalytic converter exhaust with a Palladium filter insert. This greatly reduces the number of pollutants coming out of the engine. No other motorized bicycle engine kit has this in Canada.

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Customer Reviews

  • Overall Rating
    Great Product!
    Review by Tristanon 1/30/2015
    These are great replacement engines for those who went a little too rough on there original...hehe. The one difference I found out later was that the front bracket that attaches to your frame is larger than the original, now 2 inches apart from center of bolt holes. I think this is a great improvement but I was using a special engine mount that was not compatible, with a little DIY everything worked out fine. Just thought I would let others know just in case they are using the OCC Stingray mounts. Overall its a great investment and getting it from a reliable company like Motorized Bicycle Canada you can't go wrong!!!