====== H ======
===== Hammer =====
A universal highly calibrated poundometer used for performing precise percussive maintenance. ((church house mark))
===== HDI =====
Harley Davidson International - Sportsters sold outside the United States are sold by HDI.
===== Heat Cycling =====
A process of heating up and cooling down the engine’s internal parts in stages to help insure mating/ sealing of the piston rings to the pistons and cylinder walls. This process is used on a newly built engine and is done as a deterrent against microwelding.  
===== Helical Gears =====
Gear teeth with a slight curve machined to reduce noise better than straight cut teeth ((Haynes Sportster manual 1970-2010 pg REF*49))
===== Helicoil =====
A thread repair insert used to repair stripped threads i.e. spark plug hole threads
===== High Thrust Grippers =====
Term used in a 1967 magazine ad referring to the bead locking screws in the rear wheel on 67-69. ((Dr Dick http://xlforum.net/forums/showthread.php?t=1567534&page=3))
===== Honing =====
A process using sanding stones or other abrasives to rough up cylinder walls after boring to help the rings seal. Also used with finer abrasives to achieve a final clearance dimension 
===== Hoon =====
Hooligan ((Moved On from the XLFORUM http://xlforum.net/forums/showthread.php?t=359))
===== Hooroo =====
Goodbye ((Moved On from the XLFORUM http://xlforum.net/forums/showthread.php?t=359))

===== HT =====
High Tension. Describes the electrical circuit from the secondary side of the ignition coil to the spark plug  ((Haynes Sportster manual 1970-2010 pg REF*49))
===== HTFFSPTM =====
This is a technical term that means: hammer to fit, file smooth, paint to match - (milmat1)
===== HTHS (High Temperature High Shear) Viscosity ===== 
A measure of a fluid’s resistance to flow under conditions resembling highly-loaded journal bearings in fired internal combustion engines, typically 1 million per second @ 150 °C.((http://www.oilspecifications.org/articles/lubrication-glossary.php))
===== Hydraulic =====
A system of using liquid to transmit pressure from one place or another as in brake systems and clutches  ((Haynes Sportster manual 1970-2010 pg REF*49))
===== Hydrofinishing =====
Hydrogen treatment of crude oil in order to saturate the molecules and increase stability.((http://www.oilspecifications.org/articles/lubrication-glossary.php))
===== Hydrometer =====
A tool to measure the gravity in a lead/acid battery







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