Exacting tolerances 18T 50cc 110cc Assembly Quad Clutch Semi Automatic

The first sign, and the easiest to spot, is the gear lever. A manual transmission will usually have the gear numbers all laid out in a "fork" pattern, whereas an automatic if it has a gear lever at all, will show the typical "PRND" layout (for Park, Reverse, Neutral, and Drive).

A semi-automatic may have a lever or push-button controls, but it's the selection that's the giveaway. Semi-automatics don't layout the gears like a manual does, but they also differ from automatics. Semi-autos have no "Park," and instead of a "Drive" selection, it they tend to have "Automatic." Though the actual selection can vary, most modern cars present a "+" and "-" for moving through the gears manually. So the selection will be neutral, reverse, automatic, and manual +/-. Check the picture below if that was a bit much to follow.

The next thing you can do is take a look under the hood. This may be tricky or impractical if the vehicle has a lot going on in there and you can't see the transmission itself for other components. In general, though, you're looking out for linkage cables and transmission cooler pipes as signs that it's not a semi-automatic.