Motorcycle Glossary of Terms
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V5 - Vehicle Registration
V10 - Vehicle Relicensing
V11 - Vehicle Relicensing
reminder and application form
V55 - First Registration
and vehicle licensing form
Vacuum gauges - Clock-type
guages for measuring intake tract vacuum.
Used for carburettor synchronisation on multi-cylinder
Valve - A device through
which the flow of liquid, gas or vacuum may
be stopped, started or regulated by a moveable
part that opens, shuts or partially obstructs
one or more ports or passageways. The intake
and exhaust valves in the cylinder head are
of the poppet type.
Valve clearance - The clearance
netween the valve tip (the end of the valve
stem) and the rocker arm or tappet/follower.
The valve clearance is measured when the valve
is closed. The correct clearance is important
- if too small the valve won't close fully
and will burn out, whereas if too large noisy
operation will resullt.
Valve lift - The amount
a valve is lifted off its seat by the camshaft
Valve timing - The exact
setting for the opening and closing of the
valves in relation to piston position.
Vernier caliper - A precision
measuring instrument that measures inside
and outside dimensions. Not quite as accurate
as a micrometer,but more convenient.
VIN - Vehicle Identification
Number. Term for the vehicle's engine and
Vinnie - Common term for
a Vincet motorcycle.
Viscosity - The thinkness
of a liquid or its resistence to flow.
Volt - A unit for expressing
electrical pressure in a circuit. Volts =
current x ohms.
VOSA - Vehicle & Operator
VRO - Vehicle Registration
V-Twin - Two-cylinder engine
layout in which the cylinders for a 'V' shape.