====== L ======

====== Lambda Sensor ======
Oxygen sensor that's placed inside the exhaust system to measure exhaust gas oxygen content
====== Lapping (Valves) ======
Process of de-carbonizing/ cleaning the valve faces and valve seats
====== Late Model ======
The MoCo decided what and when to call early and late models based on many factors. One of which is the date that a change was made. For instance, if in mid July (early season) Sportster models had a part or manufacturing change, late July or early August becomes "Late" for the model(s) affected. Same as with any other month of the season.
====== LCD ======
Abbreviation for Liquid Crystal Display
===== Lean Angle =====

===== LED =====
Abbreviation for Light Emitting Diode
===== Lining (cylinders) =====
Process of inserting a steel cylinder insert into an aluminum alloy cylinder block  ((Haynes Sportster manual 1970-2010 pg REF*50))
===== LT =====
Low Tension. Describes the electrical circuit from the power supply to the primary side of the ignition coil. ((Haynes Sportster manual 1970-2010 pg REF*50)) 
===== Lubrication =====
The reduction of friction and wear using a friction-reducing layer. This layer can be liquid, solid or plastic.((http://www.oilspecifications.org/articles/lubrication-glossary.php))





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