• Due to COVID-19 we are experiencing shipping delays from our suppliers. Our engines will be back in stock soon!

Chain Drive System

1 Piece to 3 Piece Bottom Bracket Conversion Kit


American to European adapter kit for converting standard 1 piece crank bicycles to be used with 3 piece wide cranks such as those included with our 4G 4 stroke kits. Kit features new bearing race reducer and European bottom bracket set with a semi-sealed...

3 Piece Wide Crank Pedal Kit


3pc Wide crank pedal kit for bicycle engine kits. Bottom bracket width (including threaded ends):10 1/2" Crank Offset:1 1/4" Total installed width: 13 3/8" Inside crank arm clearance: 12 3/8" Crank arm pedal thread size: 1/2" Bikes with 1pc crank will...

Freewheel Sprocket & HD Axle Kit w/Brake


Kit includes a freewheel sprocket, heavy duty axle, and drum brake. For use with StarFire and SkyHawk bicycle engine kits. Please specify either 44, , 48, or 56 tooth sprocket. Not sure which sprocket to choose? Check out our Bicycle Engine Sprocket...

Freewheel Sprocket for HD axle


Rear freewheel sprocket for heavy duty axle. For use with 4 Stroke bicycle engine kits - requires Freewheel Thread. Available in 3 sizes: 44 Tooth, 48 Tooth, and 56 Tooth. Not sure which sprocket to choose? Check out our Bicycle Engine Sprocket Guide...

Standard Sprocket Install Kit


Standard sprocket install kit for use with 2 and 4 stroke bicycle engine kits. Available with 9 hole configuration only. The small kits include a 5-piece, double-sided metal mounting plates where as the large kits include a 2-piece single sided mounting...

Chain Breaker Tool


This tool is critical in helping get the length of your chain to the custom length needed for your special build! Choose between the 415 chain size and 410 chain size versions.

415 Heavy Duty Chain


Our 415 Heavy Duty Chain is thicker than a standard bicycle chain. It's built specifically for motorized bicycles so it will stand up to the stress and punishment that a bicycle engine kit enthusiast demands. Don't bother with the cheap and puny...

Deluxe Spring Loaded Chain Tensioner


Stop replacing your idler pulley and bearings so often! The spring tensioning helps to set just the right pressure on the sealed bearing within the tensioner allowing the tensioner to last a lot longer.