A leak jet is utilized by a carburetor accelerator pump (AP) circuit to control bleed back into the float chamber.

A linked braking system utilizes a single control to operate both front and rear brakes. When applying the front brake, the rear brake is also activated, although not at full strength, and when the rear brake is applied the front brake is also activated, but again, not at full strength. As an example, the 1998 Honda CBR1100XX Blackbird is equipped with a linked braking system.

Passing between lanes of stopped or slower-moving vehicles on a motorcycle. Lane splitting is not permitted in most of the U.S. although legal in California at the time of this publishing, it is allowed in many other countries and may provide a safety benefit and reduce traffic congestion. Also called “lane sharing.”

For your health and well-being it is advisable NOT to split lanes in areas where it is illegal. Aside from getting a ticket, motorists are not expecting to see a motorcycle in their lane and may intentionally or unintentionally run you down.

The lower engine of an engine describes the section below the cylinder base gasket surface. This includes but is not limited to the connecting rod(s), crankshaft, cases, clutch and transmission. Also called the bottom end.

The side-to-side movement or wobble indicated by measurement of a motorcycle wheel or brake disc. If the lateral runout is out of specification the component must either be adjusted or replaced.

A locknut refers to either a special nut or the positioning of a nut on a bolt that is designed to keep another nut or that bolt from coming loose. Lock nuts are often used in critical applications where serious harm to the user (rider) or damage to the equipment (motorcycle) could occur if the nut or bolt came loose.

On a motorcycle it is not uncommon to find a locknut in use on the front brake lever and clutch lever pivot bolts, tappet adjusters on valves, drive chain adjusters, throttle and clutch cable adjusters.

Locknuts are sometimes called jam nuts.