Dirt bike

[Greaser Greg]

https://stlouis.craigslist.org/mcy/d/fallon-1971-suzuki-ts185/7075322779.html

[pdxjim]

Those are great bikes and Suzuki made approx 1,000,000,000 of them, so parts are pretty easy.

A friend races one in the 6hr kart track endurance race we have every year.  It isn't very fast but it always finishes.

[Czakky]

Ha! That pic raises so many questions. 

[85RZwade]

6 hours is a long time...