====== R ======

===== Race =====
Circular hardened steel bands of metal used to house a set of bearings within an inner and outer 'race'.

The after affect of building a performance engine 8-)
===== Radial Play =====
Up and down movement around a shaft  ((Haynes Sportster manual 1970-2010 pg REF*51))
===== Radial Ply Tires =====
Tire plies are run across the tire from beab to beab and around the circumference of the tire making it less resistant to tread distortion.
===== Radiator =====
A component that circulates engine coolant through multiple cooling fins to reduce the temperature of the coolant
===== Rake =====
Rake is a term used to describe the angular relationship between the bikes steering stem and an imaginary vertical line dropped down from the centerline of the frame neck to the ground  ((http://chopperhandbook.com/rake.htm))
===== Rebound Damping =====
A means of controlling a springs natural tendency to bounce back after being compressed.  ((Haynes Sportster manual 1970-2010 pg REF*51))
===== Recitfier =====
Converts Ac electrical current from the alternator output into DC electrical current to charge the battery
===== Refining (Oil) =====
A series of processes through which crude oil is converted into a petroleum product. Such processes include: thermal cracking, catalytic cracking, polymerization, alkylation, reforming, hydrocracking, hydroforming, hydrogenation, hydrogen treating, solvent extraction, dewaxing, de-oiling, acid treating, clay filtration and deasphalting.((http://www.oilspecifications.org/articles/lubrication-glossary.php))
===== Regulator =====
Maintains the charging voltage from the alternator within a specific range
===== Relay =====
An electrical device that switches heavy current on and off by using a low current auxiliary current  ((Haynes Sportster manual 1970-2010 pg REF*51))
===== Resistance =====
An electrical path's ability to pass electric current as measured in OhMs

===== Rim =====
===== Ring Sticking =====
Ring sticking occurs when the piston ring sticks into the groove due to excess contamination.((http://www.oilspecifications.org/articles/lubrication-glossary.php))
===== RPM =====
Abbreviation for Revolutions Per Minute
===== RTFM =====
Abbreviation that means: Read The Factory Manual.
===== Runout =====
The amount of side to side movement of a wheel or shaft


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