How to Install a Gas Engine on a Mountain Bike Suspension

Small, gas motors can turn just about any bicycle into a moped of sorts. If you are creative with your choice of bikes, like a mountain bike, you can have a motorized bicycle with suspension. That basically means you could have a very lightweight motorcycle that you can pedal from time to time. This may seem odd to some, but it's an excellent way to build a gas sipping ride while keeping it a gas-free conveyance for fun pedaling.

Things You'll Need

  • 2 chairs
  • 2 C-clamps
  • Gloves and eye protection
  • Screwdrivers
  • Socket wrenches
  • Pliers
  • Small, self-contained gas engine with sprocket kit
  • Gas
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Instructions

    • 1

      Prop the front end of the bike between two seat backs. If there are clearance issues with the floor, remove the front wheel. Secure in place with C-clamps.

    • 2

      Remove the bike seat with screwdrivers and/or socket wrench. You will be placing the motor behind the seat and removing it allows for more clearance.

    • 3

      Open the small, self-contained gas engine with sprocket kit. The instructions will give you step-by-step guidance as to how to assemble it. If there are no instructions, find the mounting bracket and set it aside.

    • 4

      Remove rear wheel, if called for by the instructions. If there are no instructions, remove rear wheel and set aside.

    • 5

      Add sprocket/gear to rear wheel. This sprocket/gear will spin freely unless the motor spins it.

    • 6

      Connect mounting bracket. Normally this is a two or three piece bracket that will cradle part or all of the motor. It must be attached solidly with no play whatsoever.

    • 7

      Attach motor to bracket. Be sure there is enough clearance for the bicycle seat to be reattached later.

    • 8

      Add chain to motor. This is a crucial component and it needs to be tightened according to the directions. If there are no directions, be sure not to overtighten or undertighten the chain. A quarter to half inch of travel/slack is ideal.

    • 9

      Reconnect rear wheel with additional motor chain and regular bicycle chain. Be sure the derailer and gear changes work as before.

    • 10

      Add the gas tank on the cross-member butting up to the gooseneck. Run the gas lines to the motor.

    • 11

      Run throttle line to handlebars and connect on either side at your discretion. Many prefer the right side. Be sure there is enough slack in the throttle line not only for turning the handlebars but for suspension travel as well.

    • 12

      Add a little bit (a cup or so) of gasoline and start the motor. Be sure your spark plug is connected properly and simply test the motor for power and gears for function before completely reassembling your bike.