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2. Oil pump (internal combustion engine) - Wikipedia

   en.wikipedia.org/wiki/Oil_pump_(internal...

   Indications of low oil pressure may be that the warning light is on, a low pressure reading on the gauge, or clattering/clinking noises from the engine. Low oil pressure is a problem that must be addressed immediately to prevent serious damage. The leading cause of low oil pressure in an engine is wear on the engine's vital parts.

3. Motor oil - Wikipedia

   en.wikipedia.org/wiki/Motor_oil

   An engine oil using a polymeric viscosity index improver (VII) must be classified as multi-grade. Breakdown of VIIs under shear is a concern in motorcycle applications, where the transmission may share lubricating oil with the motor. For this reason, motorcycle-specific oil is sometimes recommended. [18]

4. Automatic lubrication - Wikipedia

   en.wikipedia.org/wiki/Automatic_lubrication

   The oil is contained in a reservoir that connects to a small oil pump in the engine, which needs to be periodically refilled. Oil injection pump on a Yamaha DX100 - just behind the carburettor (visible on the left) It is the primary component of two-stroke automatic lubrication system.

5. Engine tuning - Wikipedia

   en.wikipedia.org/wiki/Engine_tuning

   A "major overhaul" is composed of the whole engine assembly, which requires the engine to be removed from the vehicle and transferred to an engine stand. A major overhaul costs more than a top overhaul. "New limits" are the factory service manual's approved fits and tolerances to which a new engine is manufactured.

6. Dry sump - Wikipedia

   en.wikipedia.org/wiki/Dry_sump

   The Yamaha TRX850 270-degree parallel twin motorcycle has a dry-sump engine. Its oil reservoir is not remote, but integral to the engine, sitting atop the gearbox. This design eliminates external oil lines, allowing simpler engine removal and providing faster oil warm up.

7. Total-loss oiling system - Wikipedia

   en.wikipedia.org/wiki/Total-loss_oiling_system

   These engines were designed to have a total-loss lubrication system, with the motor oil held in a separate tank from the fuel in the vehicle, and not pre-mixed with it as with two-cycle engines, but mixed within the engine instead while running. Castor oil was often used because it lubricates well at the high temperatures found in air-cooled ...