| Babbit: | - Bearing compound found in plain crankshaft bearings.
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| Back Roads: | - Off the main highway. Usually the preferred path of the motorcyclist.
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| Balaclava: | - A head and neck warmer with mouth and eye slits. Surprisingly effective.
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| Balancing Carbs: | - Carb Balancing
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| Banana Seat: | - A long seat designed for riding 2-up
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| Basket Case: | - A Motorcycle that has been taken apart and thus is in pieces. For the seller expecting to put it back together, it is a project. To the buyer, it is a basket case
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| Battery: | - Stores charge. The juice to turn the electric starter over to start the bike comes from the battery. On some bikes, the battery provides charge to the coils which then fire the Spark Plugs. (Other bikes use Magnetos or other arrangements instead of drawing off of the battery.) On most bikes, the battery is 12V. Some older, smaller, or more obscure bikes use 6V. See also Lead Acid Battery and gel battery.
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| Bearing Preload: | - The slight pressure holding tapered bearings together.
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| Bearing Race: | - One of the two bearing surfaces that the balls or rollers ride against
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| Bearing Spun: | - Spun Bearing
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| Beemer: | - A BMW Motorcycle

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| Beeza: | - A BSA Motorcycle
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| Big End: | - The end of the connecting rod that attaches to the crankshaft in the engine
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| Big Four: | - Honda, Yamaha, Suzuki, and Kawasaki
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| Biker: | - One of many images of Motorcycle riders. Generally one who is close to being, but not quite an outlaw.
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| Bikie: | - One who fits the outlaw image
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| Bikini Fairing: | - A short, small fairing, typically mounted to the front end of a Motorcycle rather than the frame. More for style than for substance.
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| Bimmer: | - A BMW car

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| BMW: | - Bayerische Motoren Werke AG

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| Bottom End: | - The crankshaft, crank bearings, journals, webs, and connecting rod lower ends in an engine. Everything in the engine that isn't in the top end.
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| Boxer: | - A horizonatlly opposed engine in which each piston has its own crank pin, causing the pistons to beat in and out in synchrony, theoretically eliminating vibration.
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| Brakes: | - Those things that make you stop. Can include disc brakes, drum brakes, hydraulics, or cable actuation
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| Brake Disc: | - The friction surface that spins with the wheel in a disc brake. Easy to replace, but fairly expensive.
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| Brake Drum: | - The friction surface that spins with the wheel in a drum brake. Practically impossible to replace and expensive to boot.
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| Brake Pads: | - The friction surface on the stationary caliper section of a disc brake. Reasonably difficult to replace, but pretty cheap.
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| Brake Shoes: | - The friction surface on the stationary section of a drum brake. Fairly difficult to replace, but pretty cheap.
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| Brain: | - Vehicle control computer
- Arguably, the most important part of the seat-handlebar interface unit. Often protected by a helmet.
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| Brain Bucket: | - Half Helmet
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| Brights: | - High beams
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| Brushes: | - Rub against the commutator in a DC generator providing a constant electrical connectiong along a moving surface.
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| Bump Start: | - Turn on the ignition. Turn on the safety. Put the bike in gear. Hold in the clutch. Run along side the bike. Jump on, drop the clutch, and pray.
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