How to Make a Really Cool Gas Powered Motor Bike

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Introduction: How to Make a Really Cool Gas Powered Motor Bike

make a cool bike that make a great speed of 20 to 30 mph ( depends on CC of
engine too )

Materials:

fishing line
a box of straws
a small box
a Bike with hand brakes
a bike rack that connects to the seat   
a couple different sized chains
and a 49cc to 100cc engine

tips:
if you get a chain saw engine it will have lots more torque and power,
if the engine has a clutch it works better   

Step 1: The Engine

I mount the engine ( green ) on the rack of the bike
with the gas ( red ) tank strapped on to the box ( yellow ) strapped to the rack ( orange )

Step 2: The Throttle

The throttle on the engine should be near the carburetor and it's a little lever that I tie fishing line to

I tape straws ( blue ) on the side of the bike running fishing line through them,
the hand brake for the front tire disconnect it from the brake the tie the remaining end of fishing line to the brake handle



Step 3: The Chains

Take a couple chains until you find one that fits tightly and snugly 
 

In the picture it is running from the engine to the back gear 

Step 4: Starting Up

Pull the handle with the cable to start the engine then test your throttle by puling on it like a brake

then test ride

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    user

    We have a be nice policy.
    Please be positive and constructive.

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    27 Comments

    It would be very helpful if you could add pictures or videos of your build so that we can see how yours turned out and build ours to match that.

    hi i bought a 66cc engine from dragonbikes its an australian company the engine looks sweet runns ok when it starts ive replaced the plug the filters but or some odd reason i ride about 5ks then bang it bogges out n dies then wont restart (been late for work many times)i dont push it hard followed the manufactures suggestions n still wont run correctly and for long any help plzzzzzzzz thanks n my fuel mix is 40:1

    3 replies

    Unless you have a transmission, it sounds like you could have a bad gear ratio. I recommend trying to add a clutch and shift lever, but that might be hard...

    user

    Domin8er, you are likely pulling vac in the fuel tank. Next time it bogs on you, quickly unscrew the fuel cap and it should start running again. If this is the problem, drill a very small hole through the center of the cap to let air in while you are riding.
    Hope this helps.
    Mark

    You may have to steep of a gear ratio or the motor is blown. Take the spark plug out and put your thumb on the hole and pull the cord a few times. If you feel no pressure then you need a new motor.

    also, where do i get a chain sprocket that fit my chain and engine?

    how do i attach the motor to the bike rack? i have a chainsaw powerhead.

    I think you may be better off using actual bowden cables and connecting to an unused brake lever.

    I do believe he meant that it would be too powerful, and not a space consideration. You can mount a pretty large engine to the back of a bike, much larger than an inframe.

    1 reply

    you will need at least 20 to 1 ratio better 27 or 28 to 1 or the clutch will burn out .
    I have buils one so it took several trys to get it right .but it will take off with my 230 lb but on it and not have to peddal at all and run 25 mph easy if you want to go that fast ?

    2 replies

    what kind of ratio are you talking here?

    Gear ratio, a 27 to 1 ratio means that to turn the wheel 1 time, the motors crank has to spin 27 times.

    this seems a bit crude, but I like that you actually built this up yourself rather than just buy and install a bike motor kit like the other ibles.

    Congratulations, this is a nice work! But I think a 100 cc engine would be too much for a bicycle, a little dangerous.

    3 replies
    user

    Were does it say a 100cc?

    TSC, It say 100cc in Introduction:

    Materials:

    fishing line
    a box of straws
    a small box
    a Bike with hand brakes
    a bike rack that connects to the seat
    a couple different sized chains
    and a 49cc to 100cc engine

    user

    Oh yeh!

    or you can, you know...pedal.