How to Make the Cheapest Motorbike Ever!

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About: i am in school and i like to build things i prefer everything that has two wheels and most of my projects require the use of not many tools as i dont have a torch or a welder or a pipe bender

 I have started makeing this instructable since I cant find anything nice on how to make a cheap motor bike. so here it is (my cost was ONLY $30) but i already had the motor and some other stuff. you will need to read through this whole instructable before you start also this is my second instructable so i may have forgoten something so just leave a comment. you should reach speeds up to 30mph depending on weight and ratio and the size of the engine.
  you will also want to check your local laws to make sure it is legal! and stuff

Step 1: Materials!

in this project you will need,
1. a bike of any size
2. a weed eater motor ( I used a 25cc craftsman)3. angle aluminum (hardware store)
4. a 6" long 5/8" threaded bar with 2 matching nuts5. a bike peg

Step 2: Prepare the Motor

it is better if the motor you are using doesn't have a clutch if it does then remove it. now take off all the plastic on the motor that doesn't need to be there mainly just over the flywheel. then if your motor doesn't have a clutch remove the cover over the crank shaft, not the crank case! it will take lots of effort, it helps to use a hammer. then take your bike peg and see if it fits the threading if it does your lucky, if it doesn't take the cover to a machine shop and have it threaded to fit the peg this is what i had to do

Step 3: Prepare the Bike

get the bolt and mount it to the brake cross section with two u bolts you will not have use of the rear brake on this bike so be carefull

Step 4: Mount the Motor

you are going to want to mount the motor on a piece of angle aluminum and a tension spring to keep it on the tire i am pretty sure you can figure it out based on the photos but if not just comment.

Step 5: Set Up Electonics and Throttle

set up the kill switch on the handle bars i just went and used the kill switch from the motor and extended it with some normal electrical wire from home depot. the throttle is very tedious to connect and is different on every motor, so your on your own then but use the rear brake lever for and cable

Step 6: Finally Done, Lets Ride!

now your done go impress everyone thats has been doubting you to start you just peddle and give it some throttle and keep peddleing when you are going slow just to keep the engine from stalling. please comment and rate! my motor just died so i am replacing it then i will post a video of it working.

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47 Discussions

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Infinite Gam3r

1 year ago

Hey dude thanks for making this how-to page because me and my bro really want to make a weed eater bike and I think this will be extremely helpful. Also you did a good job at making your bike!

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JohnJ350

1 year ago

Just wanted to give you a 2 thumbs up,pretty awsome little dude,,about how much did you spend?ill be atempting my.own bassed on gour instructions in about a week or so.

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brads4

3 years ago on Introduction

brads4. u can email me at hugobrad25@gmail.com. or call me at 580-280-5411. facebook has made my account temporarily unavailable. wonder whats up with that!!!!

1 reply
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bdaman4bbrads4

Reply 1 year ago

Hey buddy i am attempting to try thiz myself real soon if i have any delima may i give you a call....it would be greatly appreciated.

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DakotaA1

3 years ago on Introduction

are you suppose to take the clutch off cause every vedio i watched they say to take the clutch off.And some say to use a clutch

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zachh45jamesonmarkeybacon

Reply 2 years ago

ya mostly craftsman clutches are horrible its like you hit too big of a peice of grass and the clutch fails

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brads4

3 years ago on Introduction

i can't believe u took off the clutch when u could have welded the footpeg to the clutch drum eliminating the need for a tensioner. also the engine l bracket could have been bolted to the seat seat post other than that u did ok. i had a schwinn (sp) english racer when i was 11. i bolted an 80cc westbend 2 stroke to it and direct drove an 8 tooth sprocket to a 40 tooth i had brazed to the rear wheel spokes. u do the math. i was doing about 120 when i eased by the 1st baptist on US 183 in snyder, ok. the nightwatchmen was drunk and asleep at the wheel of his wagon. seems to me that jess dunn and i lifted two motors from a warehouse on s. najavoe in altus. he took the clinton 50cc. jess was not too damn bright.

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patd20017brads4

Reply 2 years ago

hey if you can give me a text to patrickd2017gmail.com I was wondering if you can build one and ill pay you or if someone else would for a price

thanks

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FatdaddySpatd20017

Reply 2 years ago

My father makes homemade motorbikes
he said he is willing to make yu won if you are interested

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miles315

2 years ago

Hi, I was wondering how you connect the peg to the motor? Do you need to weld???

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Omark42

2 years ago

how do you put the peg on the motor

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R1SK

2 years ago

What is the best style/tread tire to use with this design?

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GageJ

3 years ago

I found a 33cc leaf blower motor laying around. Anyone think it'll work well? I mean, surely it'd be faster than a 25cc?

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DevM8

2 years ago

great work. looks easy to run.

I am impressed by low power motors/engines. its just the fuel economy that doesn't seem to work.

really good video

thanks

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TrollZen

2 years ago

im working on something like this myself in my workshop

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Velixare

3 years ago

Another question, is there a way to modify it so you still have the back brakes?

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Velixare

3 years ago

Would a 18cc engine work, i realize if it does it won't be near as powerful. Just asking if it would still work or not?

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BobbyT3

3 years ago

Much easier to just use 2 sprockets and make it a chain drive bike. I used a regular buke chain to pedal it and start it and a thick chain from a transfer case of an f150 plus a 10$ snowmobile sprocket forbthe motor drive