Don Butler Pedal Power Custom built 69cc Gold Finger 911

Grubee Inc


Introducing you to Roy Don Butler who owns and operates Don's Speed Shop dba: Pedal Power in Chickasha OK.    Don is a full time engine builder that takes our Gt5A-ES engine to the next plateau of performance.   

Here's what he does.

  • Disassembles stock SkyHawk engine and drills more holes in the crank fly wheels to match the counterbalance weight of the piston, pin and connecting rod. 

  • Removes the stock SkyHawk cylinder and piston.  

  • Installs the Taiwan manufactured Falcon Nikasil 911 Cylinder & windowed Piston assembly.   

  • The 911 cylinder and piston changes the stroke to 40mm with the addition of a 2mm bottom spacer thus making a 69cc engine displacement.   

  • Removes the Stock SkyHawk Clutch shaft spring and installs a 3 spring heavy duty clutch plate which prevents a slipping clutch due to higher achieved horsepower.  

  • Installs a Dio Reed Valve assembly for piston port induction.  

  • Installs a high quality 21mm dia. slide valve carburetor which is much bigger than the 14.95 dia. slide valve found with stock China doll engines.  

  • Installs a high compression CNC head with copper gasket. 

  • Bench runs a live test with a dedicated carb to confirm all is copasetic.

  • The engine is shipped with a untuned CARB DUE TO NOT BEING ABLE TO SHIP A CARB THAT HAS HAD GAS IN IT.   

  • Don includes an assortment of jets so the end user can tune as required for the conditions in their locality.   

  • This engine is not a fuel saving get around town on a dime engine.   It's made to turn enthusiasm into fear! 

  • Don says 60mph has been documented with this engine properly tuned with expansion chamber exhaust and ran with the right ratio rear sprocket on flat land when ridden by a trained Chimpanzee.   Just kidding about the unknown rider!

  • The SkyHawk cordless drill start OCDT feature is appreciated when starting this hopped up engine. 

  • When you order this engine we have it dropped shipped direct from Don's shop to you.   

  • We provide you with the contact email and phone # so you can deal direct with Don on any issues of importance.