Engine oil guard, bike engine guard

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Engine guardBike engine guard

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Motorcycle engine

• A motorcycle engine is an engine that powers
  a motorcycle. Motorcycle engines are
  typically two-stroke or four-stroke internal
  combustion engines, but other engine types, such
  as Wankels and electric motors, have been used.
• Although some mopeds, such as the VeloSoleX, had
  friction drive to the front tire, a motorcycle
  engine normally drives the rear wheel, power
  being sent to the driven wheel by belt, chain or
  shaft. Historically, some 2,000 units of
  the Megola were produced between 1921-1925 with
  front wheel drive, and the modern Rokon, an all
  terrain motorcycle with both wheels driven, has
  been produced since 1960.

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Types of Engines

• Almost all production motorcycles have
  gasoline internal combustion engines.
  Both four-stroke and two-stroke engines are used,
  but strict emission laws have led to far fewer
  two-strokes. A few have used Wankel rotary
  engines, but no Wankel bikes are currently in
  production. Motorcycle engines can be air
  cooled or liquid cooled, and optionally
  include oil cooling as well. Some scooters use
  batteries and an electric motor. The 2009 TT
  races introduced a new category 'TTX' (renamed
  as TT Zero) for electric bikes using fuel-cells or
  batteries.
• Motorcycle engines can be mounted transversely
  with the crankshaft aligned perpendicular to the
  frame or longitudinally, with the crankshaft
  parallel to the frame. Motorcycles with
  transversely mounted engines are more suited to
  have chain or belt final-drive. Motorcycles with
  longitudinally mounted engines are more suited
  for shaft final-drive.

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Two strokes engine

• Two-stroke engines have fewer moving parts than
  four-stroke engines, and produce twice the number
  of power strokes per revolution.
• Fuel economy is better in four-strokes due to
  more complete combustion of the intake charge in
  four-stroke engines.
• Nevertheless, two-strokes have been largely
  replaced on motorcycles in developed nations due
  to their environmental disadvantages. Cylinder
  lubrication is necessarily total-loss and this
  inevitably leads to a smokey exhaust,
  particularly on wide throttle openings.

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Four Strokes Engine

• Cylinder head design has a significant effect on
  the efficiency of combustion, and hence the power
  output of the engine. The head may be flat, in
  which case the combustion chamber resides within
  the cylinder and/or a depression in the piston
  crown, but usually a "dome" within the cylinder
  head provides most of the combustion volume.
• Motorcycles, use poppet valves in a range of
  designs side valve, overhead valve (OHV)
  with pushrod operation, overhead cam (SOHC),
  and double overhead cam (DOHC). A cylinder
  with desmodromic valves may have three or even
  four camshafts.

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