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YPVS
Did you know what is YPVS ? Maybe some of
you guys knows but some don't . Nevermind I will tell you
anyway . YPVS is shortform from Yamaha Power Valve System
. It was invented by Yamaha Corp. for certain bikes . I
only know two bikes that use this system . They are Yamaha
TZM150 and Yamaha TZR250 .
This system are in charge of the ignition
system and the exhaust valve system . Yes , I know two stroke
bike don't use valves but mine does . The valve the system
using is diffrent than 4 stroke bike . It looks like a cylinder
. It has grooves on it . The system are made of :-
The power valve is controlled by a motor located below the
fuel tank . The motor is the main servo unit . The servo unit
turns the power valve pulley according to the ignition pulse
and the engine's RPM . So that's mean the higher the RPM ,
the bigger it opens .
I'l upload the picture a.s.a.p.
