Engine Oil Guards, Bike engine Guard

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2. MOTORCYCLE ENGINE  A motorcycle engine 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.

3. 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.

4. 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.

5. 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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