Actually, it is a time machine to my youth.
This, gentlemen, is the quote of the day.![]()
I built an motorized bicycle for cheap transportation. Actually, it is a time machine to my youth. When I was about 11 a friends father made a bicycle with a reverse acting clutch that tightened a belt from the engine pulley to a pulley welded to a shortened crank. That drove a small sprocket on the right side to a regular front sprocket at the rear hub. A five-horse Briggs provided more go than a kid should have. No pedals required. We rode that thing everywhere and back. One day a really nice bike showed up in the trash at work. A coworker didn't want it anymore. Your trash, my treasure. But still all I did was pedal. After a year or so my wife bought a kit from DAX as a surprise gift. It sure is a great feeling to move through the world without a cage to dull the senses. Did I mention that I built my motorized bicycle for cheap transportation?
Friction drive is definitely the simplest, most hassle-free
way to go. The only drawback is slippage in the wet.
Where I live, it gets really soggy 7/8 mos. a year.
Happily, I fabricated a pretty bomb-proof roller, and
that failing, my Dax converts to a DIY belt drive in
about 30 minutes.
Actually, now I've 2 bikes, one Staton Friction/GX35,
the other, the Dax belt setup/Tanaka PF4000, both
with really low ratios that will cruise lazily at 15 mph
up almost anything.
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15yrs old... son you don't need an engine. Your young body is
the best engine you could hope for. Get out there and use it; make
it strong. Build stamina on a real bike. Engines are for fat@$$
old men like me.