How to Build a Go-Kart Lawnmower Engine

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By Nathaniel Miller
eHow Contributing Writer

Article Rating: (20 Ratings)

Go-Kart

Go-karts are short, light cart frames designed to be driven by small 3-5 horsepower engines. They are machines that can be built or upgraded for next to no investment. One such upgrade is a new engine. Engines specifically designed for go-karts can be purchased, however, lawnmower engines are perfect for swapping onto go-kart frames. They are small, easy to come by, and significantly faster than the current go-kart engines. This article explains how to mount a lawnmower engine onto a go-kart in a few simple steps.

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Difficulty: Moderately Easy

Instructions

Things You'll Need:

Donor lawnmower engine
Go-kart frame
Driveshaft cog
Axle cog
Chain
3 ft. by 3 ft. sheet of stainless steel sheet metal

Step 1

Buy or find the lawnmower (push mowers work best) that you will be getting the donor engine from. Check the engine for major damage and see if it will start up. Check to make sure the pull cord is not jammed (this is a common problem).
Step 2

Disconnect the blade from the drive shaft on the bottom of the mower deck. This can usually be done by loosening the one or two screws located on the blade.
Step 3

Loosen the bolts holding the engine to the mower deck and break the engine free from the deck. Detach any wires or cords connecting the engine to the deck or the handlebar.
Step 4

Fashion a bracket from the stainless steel sheet metal that mounts the engine on its side at a 90-degree angle. This allows the drive shaft to be located in the proper position to attach the cogs and chain.
Step 5

Mount the cog to the drive shaft and connect the chain to the go-kart's axle cog. Attach the gas tube to the carburetor and connect all of the electrical connections as they were on the lawnmower. Pull the cord and get started racing!

Tips & Warnings

Check junkyards and small engine repair shops to find old engines for sale.
Make sure the engine you use is not the open-cell kind that will allow oil to spill into the carburetor if tipped on its side. This could prove very detrimental if used for a go-kart application.

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