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4-stroke gas scooter build

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CI:
I purchased an electric scooter a few years ago to accompany my wife while she runs early in the A.M.
She is recovering from cancer, and is in remission, and trying to stay healthy.
This town is no longer safe, and just a few years ago, and a few miles away, another woman was murdered doing exactly what my wife does, ie: jogging early in the morning (no we can't move to a safer city; that is not practical).
My knees will no longer withstand running, and our neighborhood is hilly, so while I can bike the route (4 miles), that is a stretch for me.

My electric scooter has been plagued with flat tires, and the tubes are expensive.
The even larger problem is that the electric motor is built into the one-piece rim, and that makes changing the tire much more difficult.
I resorted to using Slime (tm) in the tires, and that helps for a while, but the tires eventually go flat again, and then you have a terrible mess with slime going everywhere when you have to drag the tube out.
Charging the battery requires 12 hours, and while my scooter has a quality Samung (I think) battery, there is always the worry of a battery fire.
And one has to look at the gauge, and guess if there is enough power in the battery to make another ride, or whether it needs charging.
I want to dispense with the battery and charging process.

In frustration, I purchased an inexpensive asian 50cc 4-stroke scooter, and that was a mistake.
The first time I rode it, it shook violently, would hardly pull me up hills, was very loud, and bolts were falling out of it literally all over the engine and scooter.
Total junk; lesson learned.

In desperation, I am building my own 4-stroke gas scooter, and this one will have split rims, so that I can easily change a tube, and readily available and inexpensive tubes and tires.

The smallest Honda motor I could find is a 120cc horizontal shaft, so that is what I purchased.
It is a little larger and heavier than I wanted, but I think will work well since it has 3 hp.

I purchased some rectangular tubing, and and matching the geometry/dimensions of a typical scooter.

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CI:
Here is the motor I found.
I think I need this many cc's (120), due to the hilly streets that I ride on.

This is a very high quality motor, and it does not make much noise when it is running.
It is also a well balanced motor with not much vibration.


1st time run, started on the 2nd pull.

CI:


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CI:
My electric scooter tire when flat two days ago, and I have not had time to repair it again.
It is a royal pain to change one of these tires, and extremely tedious.

In order to try and get this scooter built and functional as soon as possible, I have resorted to using a lot of off-the-shelf go-cart parts and pieces.

I bought a jack shaft and sprockets, along with a 420 chain.
I am gearing this scooter down to it will go at a relatively slow pace to match my wife's running speed.

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CI:
I am using a standard go-cart brake kit.
I may upgrade one day to disk brakes, but this brake will work for now.

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