SkyHawk 66cc Gt5A-ES Engine & OCDT - Pedal & Electric Start = FREE SHIPPING

Grubee Inc


FREE SHIPPING:   Complete run tested engine, not in pieces. 

  • Gt5A-ES > 66cc Easy Start Engine Only.   

  • Includes OCDT for 1/2" Battery Powered Hand Drill Electric Starting.

  • Includes a 7pc shim kit that allows engine mounting on 43mm down to 28mm dia. bike down-tubes.  A New addition see pics: 

  • Includes TZ High Performance Magnum Rotor and TZ CDI; 

  • Except for a Shim kit, No Bicycle installation parts are included.

  • By including a TZ CDI with matching TZ rotor the engine is assured to start easily.  

Most sellers have no clue of the differences in CDI Ignition from China.  There are 2 different suppliers    TZ & SD.    To know the difference go to our info, side of our web site and click SkyHawk 2 cycle then go to #7..   

See the info. side of our web site for more pictures and details. 

Gt5A-ES engine is considered one of the most powerful stock 66cc 2 stroke bicycle engines on the market..   ( Stock means unmodified ) 

  • Dual Start:  Can pedal start normally or you can use a 20V Cordless 1/2" drill and a OCDT to electric start!

  • These engines have TZ Rotors & TZ magneto field coils with a matching TZ CDI included. 

  • Included OCDT is an attachment tool for a 1/2" drill that enables electric starting. 

  • A 20V Cordless 1/2" drill with OCDT can spin the engine so fast it starts instantly with clutch lever pulled in.

  • OCDT means, "Overrunning Clutch Drive Tool" and is a separate order extra cost $39.95 item that requires a shipping cost of $10.   

  • OCDT works like a starter drive in a car starter.. 

  • OCDT with drill allows checking mag coil output.  22V AC at 500 RPM  

  • No need to have an expensive and heavy, bulky engine with battery and a ton of headaches with broken pull ropes and starters. 

  • Light weight is the only way to go for a motorized bicycle!

  • Harbor Freight has lowest price for Cordless  20V 1/2" Drills.  Buy the most powerful version.

  • Jim Wilson at Pedal Choppers in FL says Gt5A has 20% more power than brand X engines.    

  • SkyHawk engines have Round exhaust ports to fit round exhaust pipes for free flow scavenging.    Rectangular Exhaust ports do not dump well into round pipes.  101 common sense!

  • Big intake port has 40mm M6 stud spacing.  

  • ArBeo / Dellorto Carburetors with #58 Jet work great with this engine but you must be able to correctly install a throttle cable to enable using ArBeo carbs.     

  • New crankcase and new cylinder design for improved power efficiency.   Note where the magneto wires come out down low. 

  • Fits up to 45mm dia. Bicycle down tubes.   Ideal for Aluminum frames.

  • 7 pc. Half Moon shim kit enables installing on downtubes from 43 to 28mm in diameter.

  • This Gt5A-ES engine zipper fits on our Gt2A aluminum frame w/ built in gas tank as well as some other V frame bikes..

  • Front mounting studs are M8 not the smaller M6 studs found on some cheaper brand X engines.

  • Supplied without Gas tank, Chain, Sprocket, Carb, Controls or Muffler which are included in a SkyHawk Installation kit sold separately, 

  • OCDT Electric Drill start sure helps SICK BIKE PARTS multi-shift kit work without laborious pedaling to start the engine hence an efficiency value enhancement. 

  • Bicycle, and Cordless drill shown in pictures are not included with this engine.