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Are you referring to what is commonly known as a Go-Ped?
Verify with this description:
A Go-Ped is a skateboard that you STAND up on to ride, it has small tires, an upright handle bar up front (usually with a trigger throttle, like on a weed eater), a small motor is located on the back, usually exposed with the gas tank attached right to the motor. The motor is usually a two-stroke (30 C.C.)....the gas and oil are usually mixed manually (no pre-mix)
Is this what you're thinking of?
If so, keep in mind when I refer to it as a "Go-Ped" the relation of that name to the actual product is the relation of Kleenex to Tissue...in other words, i'm using the name of the well known company to describe the product. However, (to add to the confusion) the product is PROPERLY known as a Scooter!
Unfortunately no distinction is made between Scooters as we are familiar with them (Vespa, Honda Step-thru frames) and Scooters (as in the wee motorized Skateboard things)....the reason for this is because the First motorized production scooter was one of those "wee motorized skateboard things" and eventually evolved into the Step-thru frame Scooter that we think of today.
There's also a child's toy that was common in the 50's that was just like the "wee motorized skateboard things" except without the motor (it usually had a lever that you kicked to propel the back wheel)....this toy was also known as a scooter.
Anyway...search yahoo, lycos...etc. for SCOOTER and you'll find Go-Peds and their Competitors. If you're looking for designs, you also might look in the back of Popular Mechanics Magazine.
Skeeks rule, Decepticons Drool