Build a Better Bike
- Posted by: GOOD
- on May 2, 2009 at 9:00 am
If your commute is too long for pedal power, just add a little juice to your ride.
By Jason Cozens, as told to GOOD
I’ve been an on-and-off bike commuter for about seven years. I enjoyed riding and being outside—not being confined inside a car—but I always showed up to work covered in sweat and beat up.
I read an article about a man in Africa who built a motorized bike. The picture in the article showed this bike that looked like it was from another era. It was delicate looking, but it could get him from village to village, and it transformed his life. So I started doing some research and discovered that the motor I had seen in the article is generally known as a Happy-Time motor. They’re two-stroke motors, made in China.
So I ordered one.
They make these kits 49 cubic centimeters for a reason. If it’s 50 CCs or more you’re required to license it, to register the bike, and to license yourself. Those things might deter a do-it-yourselfer. It makes the project bigger, and it kind of takes the renegade aspect out of it as well.

When the kit came in the mail, I was shocked to find it came with no instructions. It was just a box with Chinese characters printed on it and a bunch of parts inside. The parts were all shiny and vaguely resembled the parts of a motorcycle or a car. I googled “motorized bike”—that’s what they were calling them in the article I had read—and found this community of people who make these bikes. Without the help of this nation-wide community, I wouldn’t have even attempted to make it.
I probably could have put it together in about a week, but I customized it a lot. I wanted the bike to be eye-catching and have a bit of character. I’ve always had character cars. I’ll be at a gas station with my beat-up 1976 Celica, or my beat-up 1967 El Camino, and people will come up asking how much I want to sell the car for. I love having a car you don’t see anywhere else on the road, and in the same respect I love having a bike that nobody else has. It’s kind of like a Pee-wee’s Big Adventure complex. He has his ridiculous bike and I have my ridiculous bike. Pee-wee and I were born on the same day.
It’s about a one-horsepower motor, which means it’s like riding a horse. It is a very natural amount of power to have. I don’t have a speedometer, but people have pulled up next to me and said, “You’re going thirty miles per hour.” I’d say around 30 mph, 35 mph, is my top speed on flat ground. Since it’s just a one-horsepower motor, on hills you have to pedal just like you do on a bike, but when you pedal you feel like Superman because you’re barely touching the pedals and you actually feel yourself relieving strain on the engine.
Now that my engine is broken in, I get about 150 miles to the gallon. I have a half-gallon tank, which I usually don’t fill up all the way. There’s nothing quite like the feeling of going to a gas station and telling someone I’d like 75 cents on pump two, and then seeing the shocked look on his face when I come back in for change.

The two-stroke motors from China are EPA-approved, but to really comply with the law you need an EPA-approved muffler also. There are similar, four-stroke motors that are actually green. They have very low emissions, they get over 200 miles per gallon, and they are extremely reliable. A lot of those motors come from Japan and they’re more than twice as expensive.
The quirks are what really endear me to this little machine: the fact that you have to pedal from a dead stop, or that you go faster downhill if you pull in the clutch and stop gassing—those things are unique to this form of transport. Also, the ability to use it as a regular bike is probably underemphasized in what you read about these bikes.
I spend a lot of time at The Home Depot. There are plumbing parts in and around this bike, as well as plenty of things from the 99-cent store, pieces of jewelry, and leather bracelets. You start to see the possibility of anything making its way into your own custom vehicle. Something like a doorstop becomes a fantastic way to hold a gas-tank in place.
I live a block off of Skid Row, and so many homeless people come up with a general interest. A lot of homeless people rely on bicycles for transportation, so I’m sure the gears are turning in their heads: “Wow, I could get out of town on one of these if I had a motor.” When I tell them I got my kit for $130, they’re usually blown away.
My current commute is about five miles through an older, industrial part of Los Angeles. It’s kind of miserable to sit through in traffic. But on the bike it’s actually a fantastic experience; it becomes transcendent.

LEARN MORE motoredbikes.com Want to buy a motor? spookytoothcycles.com
Photos by Will Etling










DISCUSSION: 19 Comments
Far less was spent on this engine, but I bought a Segway for commuting one way to work (17.5 miles) about a year ago. According to Florida law, I am allowed to take my Segway on our local recreation trail (The Pinellas Trail) and do not have to deal with traffic except for crossing streets. To get home from work I bicycle. Traffic in this area of Florida is pretty bad and we don’t have many bike lanes, so I wouldn’t feel safe riding a 49cc motorbike. It’s great that people are doing these things when driving a car is overkill. I know I feel so much better about commuting. Now if people would just stop making nasty comments about me riding a Segway…
Wow thats beautiful. What bike did you use for the frame ?
Since a pair of years ago this motored bikes are fairly popular in my country (Chile) and are a very very bad idea.1. Those two stroke motors pollute much more than any conventional engine because they burn gas AND oil.2. The bike design -I mean: brakes- isn’t intended for the velocity those vehicles can reach.3. You lose all the advantages of a real bike -physical activity and health- and are noisy and stinky.
The EPA estimates that one hour of operation by a 70-horsepower two-stroke
motor emits the same amount of hydrocarbon pollution as driving 5,000 miles
in a modern automobile.He says the engine has low emissions, but I wonder how much he’s really looked into it.
Great!!!!
Great!!!! http://www.msntakip.com
His reasoning is flawed. He said he liked riding his bike to work but hated showing up all sweaty. Now he has a 2 stroke engine on his bike so he will smell like oil and exhaust. Either way he stinks!!!
Ditch the motor bike, and bring a change of shirt. Thats what I do, granted it´s in the Netherlands, but still.
Better idea.http://www.electric-bikes.com/bikes/electrec.html
Moebious, how do you ride a Segway to work and a bicycle home? That doesn’t make sense (unless you work with your neighbor, who drives a pickup).
i enjoyed this story. I bike to work and everywhere, i wouldn’t change that for anything. However, this certainly looks like a fun project for sunday rides. Don’t know why everyone seems so mean in comments. Must be the anonymous thing that gives everyone such tude!
The bike looks really great, and I am sure it is fun to ride. Don’t be fooled into thinking this is ‘green’ though.
I think the speed has something to do with those aerodynamic goggles, where do I get myself a set of those sweet things…
Low emissions compared to a car. This article is really not about reducing your emissions. Human power is the way to go. 17.5 miles is really not far. Get some exercise Segway guy. Go ride a bike.
As a first time reader of Good, I was intrigued by the title “Build a Better Bike”. Not convinced this is a better bike. Human power all the way. Lazy ass Americans.
what a good idea. now we need to find a way to keep mexicans out of this country.
Our two human needs to get exercise and to not appear in sweaty shirts at the office are not particularly compatible. I want a downtown bike garage with a clean and unsmelly business clothes locker, a second smelly clothes locker and a shower.
on these bikes you do have to pedal a LOT, not vigorously but they make a 40 mile ride achievable by regular folks. Also, rather than conventional “dino oil” you can easily find cleaner burning oil…many people use castor oil and get great gas mileage and less fumes…it’s true that it is a 2 stroke engine so it’s dirtier than a 4 stroke, but if you subtract the pollution generated by your car then the numbers even out a bit. If you factor in the savings of “mental pollution” generated by sitting in crap traffic, slowing other commuters down, etc.. then the benefits become a bit more evident…also, it’s mentioned in the article that 4 stroke versions are available (still at a lower cost than electric) and they are very clean and quiet. Golden Eagle has a nice one…Obviously electric is the best option, but it is still out of the financial reach of many people, and also electrics have a very limited range and unless you buy the VERY expensive 96v models they have an embarrassingly low top speed.
“The EPA estimates that one hour of operation by a 70-horsepower two-strokemotor emits the same amount of hydrocarbon pollution as driving 5,000 milesin a modern automobile.”-anonymousthese figures are for a 70 hp engine, the one on the bike is 1 HP…not to say 2 strokes are clean…just sayin’