====== M ======
====== MAP Sensor ======
Manifold Absolute Pressure Sensor. 
===== Main Bearings =====
The bearings between the crankshaft and the engine case  ((Haynes Sportster manual 1970-2010 pg REF*50))
===== Magneto Ignition System =====
[[techtalk:miscres:miscres90-terms:term-i#ignition_system_magneto]]
===== Manometer (slack tube) =====
Pressure measuring device using liquid columns in vertical or inclined tubes. \\
One of the most common is the water filled u-tube manometer used to measure pressure difference in pitot or orifices located in the airflow in air handling or ventilation system.
A manometer can also be used to measure engine breathing pressure as a normal maintenance tool for checking ring seal wear. \\
===== Micrometer =====
A precision instrument used to measure outside diameters of parts
===== Microwelding =====
Adherence of sporadic particles of aluminum from the piston to the bottom side of the piston ring. ((http://papers.sae.org/960745/))
===== Monograde Oil =====
Oil with a single viscosity, i.e. SAE80W. AKA Straight Oil
===== Multigrade Oil =====
Motor or gear oil that has a wide viscosity range (meeting the requirements of more than one SAE viscosity grade) and thus it can be used in a wider temperature range., i.e. 10W50. The "W" stands for Winter therefore 10W50 oil has a viscosity range from SAE10 when cold to SAE50 when hot. ((Haynes Sportster manual 1970-2010 pg REF*50))((http://www.oilspecifications.org/articles/lubrication-glossary.php))
===== Multimeter =====
A testing instrument for most electrical things on a motorcycle. There are variations in makes and models but most come with the ability to check for voltage, continuity and resistance (Ohms). Some do not have a buzzer to sound off when continuity is broken but this is a very important feature to have.


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[[techtalk:miscres:miscres90|{{techtalk:miscres:gototerminologylist.jpg|}}]]
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