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Maintenance; Caburetors; Camshaft Chain, Guides, Tensioner; Cylinder Head, Valves - Kawasaki Z250 1981 Service Manual

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230 SUPPLEMENT-1981 2250A
Maintenance
CARBURETORS
Refer to Pgs. 115
-
119,
noting the
following.
Table N19 Carburetor Specifications
Type
Primary Main
Jet
Secondary Main Jet
:
Left
Right
Pilot Air Jet
Primary Main Air Jet
Secondary Main Air Jet
Pilot Jet
Pilot Screw
Service Fuel
Level
CV32
#60
#80
#85
#130
#150
#60
#35
2}'2
turns out
1.5-3.5 mm
CAMSHAFT CHAIN, GUIDES, TENSIONER
Refer to Pgs. 120
-
121, noting the following.
Chain guide wear
Table N20 Camshaft Chain Guide Wear
Front
Rear
Service Limit
1.4 mm
2.0 mm
Chain tensioner inspection
Table N21 Chain
Tensioner
Spring Free Length
!
Service Limit
39 mm
CYLINDER HEAD, VALVES
Valve seat cutters (special
tools)
are newly designed,
and the
repair
procedures are changed a little.
But,
new seat cutters
are
available for the models before
1981 model. Refer to Pgs. 121
-
126 noting the follow·
ing.
Valve, Valve Guide, Valve Seat
Valve Seat Inspection
The valve must seat in the valve seat evenly around
the circumference over the specified area.
If
the seating
area is too wide, the seating pressure per unit of area is
reduced,
which may result in compression leakage and
carbon accumulation on the
seating
surface. If the seat·
ing area is too narrow, heat
transfer from the
valve is
reduced and the valve will overheat and warp.
Uneven
seating or seat damage will cause compression leakage.
• Remove the valve, and check to
see
if the valve and
valve guide are
in_
good condition before valve seat
inspection.
• Apply machinist's dye to the valve seat, and then use
a lapper to tap the valve lightly into place.
• Remove the valve, and note where the dye adheres to
the valve seating
surface.
The distribution of the dye
on the seating surface gives an indication of seat
condition.
•If the distribution of the dye shows uneven seating
or seat damage, or if the
with
or outside diameter of
seating
surface is out of the specified range, repair
the valve seat.
Table
N22
Valve Seating Surface
Inlet
Exhaust
Outside Diameter
29.0 mm
25 .0 mm
Width
0.5-1.0 mm
0.5-1.0 mm
Valve
and
Valve Seat
1. Valve
4.
Valve Seat
2. Seating Surface (45°)
5.
Inner Surface (60°)
3. Outer Surface (32°)
Valve Seat Repair
A valve seat which requires repair is cut with a set of
valve seat cutters.
Five seat cutters are
required
for
complete repair; two 32°; two 45°; and one 60°
seat
cutters, one for the inlet and the other for the exhaust.
NOTE:
When using the cutter, be sure to apply engine
oil to the cutting part before grinding and also wipe
off ground particles adhering to the cutter with washing
oil.

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