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4-Stroke Parts

Here you will find replacement parts, upgrades, and accessories for your 49cc 4-Stroke bicycle engine kit.

1 Piece to 3 Piece Bottom Bracket Conversion Kit

$29.99

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

$29.99

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...