Valve Stem Wear; Valve Spring; Valve Seat Width - Suzuki GSX-R1000 Service Manual

Manuals by Motomatrix / The Solution For Lost Motorcycle Coded Keys
1D-46 Engine Mechanical:

Valve Stem Wear

Measure the valve stem O.D. using the micrometer. If it
is out of specification, replace the valve with a new one.
If the valve stem O.D. is within specification but the valve
stem deflection is not, replace the valve guide. After
replacing the valve or valve guide, recheck the
deflection.
Special tool
(A): 09900–20205 (Micrometer (0 – 25 mm))
Valve stem O.D.
Standard (IN.): 4.475 – 4.490 mm (0.1762 – 0.1768 in)
Standard (EX.): 4.455 – 4.470 mm (0.1754 – 0.1760 in)
NOTE
If valve guides have to be removed for
replacement after inspecting related parts,
carry out the steps shown in valve guide
replacement. Refer to "Valve Guide
Replacement" (Page 1D-47).
(A)

Valve Spring

The force of the coil springs keep the valve seat tight. A
weakened spring results in reduced engine power output
and often accounts for the chattering noise coming from
the valve mechanism.
Check the valve springs for proper strength by
measuring their free length and also by the force
required to compress them. If the spring length is less
than the service limit or if the force required to compress
the spring does not fall within the specified range,
replace both the inner and outer springs as a set.
Special tool
(A): 09900–20102 (Vernier calipers (200 mm))
Valve spring free length (IN. & EX.)
Service limit: Inner: 30.1 mm (1.19 in)
Service limit: Outer: 35.3 mm (1.39 in)
Valve spring tension (IN. & EX.)
Standard: Inner: 31.3 – 38.3 N (3.2 – 3.9 kgf, 7.0 – 8.6
lbs)/27.55 mm (1.085 in)
Standard: Outer: 91.3 – 105.1 N (9.3 – 10.7 kgf, 20.5 –
23.6 lbs)/33.05 mm (1.301 in)
email: info@motomatrix.co.uk / www.motomatrix.co.uk
Inner
Outer
(9.3 – 10.7 kgf, 20.5 – 23.6 lbs)

Valve Seat Width

1) Visually check for valve seat width on each valve
face. If the valve face has worn abnormally, replace
the valve.
2) Coat the valve seat with a red lead (Prussian Blue)
I718H1140122-01
and set the valve in place.
CAUTION
!
Do not use lapping compound.
3) Rotate the valve with light pressure.
Special tool
(A): 09916–10911 (Valve lapper set)
(A)
"a "
" b "
Tension "a"
31.3 – 38.3 N
(3.2 – 3.9 kgf, 7.0 – 8.6 lbs)
91.3 – 105.1 N
(A)
I649G1140237-03
I649G1140238-03
Length "b"
27.55 mm
(1.085 in)
33.05 mm
(1.301 in)
I947H1140094-01