Blowby Gas Recycling
Most four-stroke motorcycle engines are fitted with a crankcase breathing system. These systems are required to moderate the pressure within the crankcase and to offset the volume variations caused by the normal movement of the piston(s). It is important to note that modern crankcase breathing systems allow combustion blowby gases to escape from the engine [...]
Read More...Body Armor
Padding, hard-shelled material or other impact-absorbing material fitted to a motorcyclist’s apparel. Usually placed in high impact areas such as shoulders, elbows, back and knees. Also common in sport bike gloves and boots.
Read More...Backlash
The clearance between the meshed teeth of two gears. Usually this is measured by holding one of the gears stationary and measuring how far the other gear can move back and forth, using a dial indicator.
Read More...Backbone Frame
Motorcycles with a backbone frame use the engine as a stressed member. The backbone can be tubular or stamped steel or aluminum, and even carbon fiber is used in some exotic applications. The engine is suspended below the frame and adds rigidity and strength, allowing the frame to be smaller and lighter.
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