This test is to discover how quickly the engine can get, burn and exhaust the fuel mixture it needs to accelerate quickly. A restrictive end-can will not allow the engine to take in more fuel as it can't shift the burned exhaust gasses fast enough.

In second gear, the revs are gently increased until they pass the point where the engine makes peak torque. When this point has been exceeded by a few thousand rpm the throttle is closed. The revs then drop. When they pass the point of peak torque the throttle is slammed right open.

On the graph, the closer to the vertical the left side of the loop, the better the engine is working.

The most common dyno curve you'll see. The aim is to show how the engine makes its power. Again, on the graph flat spots are shown as little dips in the line.

This test was conducted in fourth gear. The revs are allowed to drop until they reach around 3000. At this point the throttle is opened to the stop and held there until the revs reach the redline.

Using both runs it's possible to see how well the bike is carburating. This information will help a dyno operator set up your bike with a Dynojet kit.