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Old 02-25-2017, 03:00 AM   #9 (permalink)
ProDigit
EcoModding Apprentice
 
Join Date: Jun 2012
Location: Florida
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My 2ct:
Your legal limit would be 750hp, or 1-2HP, to register it as a moped for street use.
Top speed also limited to 20MPH (30MPH in some states).
In FL, they don't care if it goes 40MPH. They won't stop you.

To reach that speed, you need at least a 500W motor.
A 750W, is half as powerful, and this just results in maintaining top speed even when going on a bridge with a passenger.
But a 500W motor, might be just a tad more efficient.
A battery pack can be gotten from BMS battery dot com.

Any faster in speed, and you'll have to get your scoot to pass DMV testing, in order to create a title for it, to register it to be able to drive it legally on the streets.

Personally, I'd go to the junkyard, or to some scoot store, and see if you can't get your hands on a scrapped 50-125cc scooter.
As long as you have a transmission, a grinder, welding equipment, you could mount even a 50cc scooter engine on the stock transmission for great MPG numbers exceeding 135MPG US.

Either way, aside from registering it as a moped, you'd probably have a hard time making it street legal, thus offroad would be the better option.

Specifications for a moped in most states are:
- <50cc
- 4 stroke <2BHP , or,
- <33cc 2 stroke at 1BHP or less, or
- 750W electric motor (1BHP), or below,
- AND must have a restricted speed of 20MPH or 30MPH depending on your state laws .

In such cases you don't need to register the vehicle.
You can however, build a gigantic battery pack for extended range, if you like, on it.

You could try to register it, if you have the legal title of the bike.
Normally you'd have to inform the DMV on any changes done to it, meaning, not only color, but also if the engine has changed (since engines usually also have VIN numbers stamped in them).
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