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How to Install a Weed Whip Motor on a Bike

A weed whip is a yard implement used to trim weeds around trees, your sidewalk and external buildings. Weed whips use a gas or electric engine to turn a rotor on the end of the body that spins a cord or string to cut the weeds. Though you can power your bike with the engine from an old weed whip, you must use an engine powered by gas.

Things You'll Need

Screwdriver
Gear for chain
Bike chain
Metal bracket
U-bolts
Nuts
Wrench
Zip ties

Instructions

- 1
  Locate the set screw that secures the motor to the body of the weed whip trimmer. Remove the screw with a screwdriver, a separate the motor from the body. Disengage the controls from the body.
- 2
  Measure the diameter of the gear used to turn the axle on the bicycle. Attach a gear of the same size or diameter to the drive shaft of the motor. Place the bike chain over the gear to ensure that it fits.
- 3
  Position a metal bracket on the bike frame above the petals. Insert U-bolts over the bike frame and through the bracket. Secure the U-bolts to the bike frame by tightening a nut with a wrench.
- 4
  Place the weed whip motor on the metal bracket. Secure the motor to the metal bracket using the bolts. Tighten nuts onto the bolts with a wrench.
- 5
  Attach the controls to the bike's handlebars. Secure the wiring for the controls to the frame using zip ties.
- 6
  Start the weed whip engine to ensure the gear spins correctly and the motor does not vibrate excessively. Turn off the engine.
- 7
  Attach the chain to the gear on the motor and the gear on the bike. If the chain is too loose, you must remove a link or two.
- 8
  Start the engine, and use the throttle controls to increase the speed.

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