In the 70s, snowmobile manufacturer Chaparral saw how popular dirt bikes were becoming, and wanted to get in on the craze. They did so with a lineup of 3 small (and apparently mediocre) mini-cycles that were deemed “Familyweight”. This was the Bullet T172, a trail bike that was a downgrade of the ST80 (despite the smaller engine, the latter had lights, horn, and a speedo).
The T172 was named for “Trail” and the 172cc Tecumseh four-stroke engine. A torque-converter enabled shift-free riding to handle the 4 horsepower. For a little more information on this bike (and many other of the minbike clones that came out during this time period), check out this article from SuperHunky).
This specific Chaparral Bullet T172 is a first-year model. While it looks to be in good shape (and I find pull start engines on minibikes to be amusing), it seems that the tank might not be original.
Find this Chaparral Bullet T172 for sale in Luther, Iowa with an opening bid of $950