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A few weeks ago I saw some kid on youtube with a motorized bicycle and I knew I had to build one. Back when I was a young boy I used to look at the ads in the back of Boy's Life Magazine and dream about getting a gas motor for my BMX bike. My mom would never let that happen but now I'm all grown up and that dream is a reality! I spent a few daze scouring eBay and finally went with a kit for 99 bucks (plus shipping). So $140 later I had ordered a Chinese-made two-stroke engine kit with everything I needed to convert my bike to a moped!
It took about 3 weeks for the kit to arrive from Canada. (I am not sure that these kits are actually "legal" to be imported to the US) The kit came in a small box with about 75 parts and came with NO INSTRUCTIONS! (I'm not too worried, there are plenty of how-tos on the web). The kit has a certain cartoonish/toy quality to it, but what do you expect for $99 + shipping? For me this is just a fun project to put together and see if I can get it to run. The kits claim to get 150 miles per gallon and can go up to 40 miles per hour! (Two stroke engines might be good on gas but that doesn't mean they are easy on the environment.) For me it is all about the excitement of getting this thing to run so I can zip around my neighborhood and run from the cops on it.
I'm planning on using my old GT mountain bike for the conversion. I recently pulled the bike out of the shed after years of neglect. I cleaned it up and replaced the tires and have been using the bike for the last few weeks. The motor is going to need some "Macgyver-ing" to make it fit, but I welcome the challenge. Maybe one day I can be as cool as this guy!
I'll keep you posted as the build progresses.
How big is that engine?
is 80cc and weighs only 18 pounds!
lightweight by design. Is that one of those 3.5hp jobbers I googled up?
My motorbike build project has proven to been more difficult than I thought it would be. Seems like almost every step has proven to be a challenge. It's been fun though and I'm getting closer to having it ready to fire up.
I first hit a snag when the bolt-on sprocket for the motor wouldn't fit over the bike hub. I had to grind down the inside of the sprocket.
Here is the sprocket ready to be bolted on. (unfortunately, now that I have everything else mounted I've realized that the sprocket will have to be flipped around, pushing the chain further from the spokes and aligning better with the motor.)
The clutch lever...
The throttle and kill switch...
Now I have the controls installed, the voltage regulator mounted, the motor bolted on, the sprocket on, the carburetor installed on the motor and connected to the throttle, the chain tensioner on. I still have to hook up the wiring, flip the sprocket around, bend the chain tensioner a little bit for better alignment, cut the chain to length, mount the exhaust, etc. But I hope to have it running soon!
Looks like you've made good progress. Can't wait to see/hear you zippin' around downtown on that thing.
Congrats, man, that's so fucking rad!
But goddamn if it doesn't look like fun!