Hpg, Gas Shock; Hpg, T/A (Take Apart) Gas Shock; Valving And Dampening - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

Section 03 CHASSIS PREPARATION
As mentioned, this calibration was used in the center shock of the 1994 MX Z (all HPG T/ A shocks
since 1995 use an internal floating piston), this type of shock could suffer from fading however, the
gas pressure assists to prevent this from occurring. Additionally, knowing this shock type, its
requirements, and mounting position, allows engineering to valve this damper accordingly.
This shock assembly is a floating piston design like the T/A type shock, without the take apart
option. This shock uses the same quality valving mechanism and floating piston configuration, but
cannot be disassembled.
This damper is completely rebuildable and all versions use an internal floating piston (IFP). It offers
the options of replacing valves or revalving and/or the option of replacing seals (should it be
needed). All HPG T / A shocks since 1995 use IFP.
Although the adjustments are internal, rather than external as in the (MVA), the rider is able to
select the exact damping adjustment required for his / her riding style.
, A06FOVS

Valving and Dampening

In the HPG shock, the piston passages are covered by a stack of thin metal shims of various
thicknesses and diameters. The shims provide dampening by acting as spring loaded valves
offering resistance to the oil traveling through the piston. There is a stack of shims on both sides of
the piston. One side controls compression dampening and the other side controls rebound
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