B2410 • B2710 • B2910 WSM, 12271
(8) Rocker Arm
1 ENGINE
The rocker arm assembly includes the rocker arms
(1), rocker arm brackets (4) and rocker arm shaft
(5),
and converts the reciprocating movement of the push
rods to
an
open / close movement of the intake
and
exhaust valves.
Lubricating oil pressurized through the bracket to the
rocker arm shaft, which serves as a fulcrum
so
that the
rocker arm and the entire system are lubricated
sufficiently.
The intake and exhaust valves (7), (8) and their
guides
(6)
are different from each other. Other parts,
such
as
valve springs
(4),
valve spring retainers
(2),
valve spring collets (3), valve stem seals (5) and valve
caps
(1)
are the same for both the inlet and exhaust
valves.
All
contact or sliding parts are quenched
and
tempered to resist wear.
11900F10060
(9) Intake and Exhaust Valve
11790F10130
(10) Valve Timing
(1
) Rocker
Arm
(2) Lock Nut
(3) Adjusting Screw
(1) Valve
Cap
(2) Valve Spring Retainer
(3) Valve Spring Collet
(4) Valve Spring
(4)
Rocker Arm Bracket
(5)
Rocker Arm Shaft
11900M10070
(5)
Valve Stem Seal
(6)
Valve Guide
(7)
Intake Valve
(8)
Exhaust Valve
11790M101
00
TOG
1.0 E.C
BOC
12010F10020
The valve opening timing
is
extremely
important for effectively intaking air into the cylinder
and
sufficiently exhaust gas.
An
appropriate timing can
be
obtained by aligning the alignment marks on the crank
gear and cam gear.
Inlet valve open
(1.0)
0.24
rad.
(14°) before T.D.C.
Inlet valve close (I.C) 0.52
rad.
(30°) after B.D.C.
Exhaust valve open (E.O) 0.96
rad.
(55°)
Before B.D.C.
Exhaust valve close (E.C) 0.24
rad.
(14°)
after T.D.C.
12010M10020
1-M5
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