CHECKS AND ADJUSTMENTS
Oil
Pressure
Eng
i
ne
oil pressure can be checked by insta.lling a gauge
in the sender switch port. Normal pressure
IS
35-40
PSI
at
2000
RPM
.
Valve Clearance
Make adjustment of valve clearance with the engine
stopped
Put a feeler gauge between rocker arm and push rod and
turn
ad
justment screw
in
or out to get the correct
clearance [A].
(See Section
88
SPECIFICATIONS for
the correct clearance.)
Compression
Make sure the crankcase oil level
is
correct, and the
battery has a full charge.
Start the engine and operate for about
30 minutes at 1200
RPM
or until the engine is at normal operating
temperature.
Stop the engine and remove all the spark plugs.
Put the carburetor throttle plate and choke plate
in
the full
open position.
Install a compression gauge
in
the No. 1 cylinder. (No. 1
cylinder
is
at the rear of the machine.)
Operate the starter until it turns the engine at least five
compression strokes and record the highest reading.
Count the number of compression strokes to get the
highest reading.
Test each cylinder.
Make a comparison of the highest and the lowest
compression readings.
If the lowest is at least 75% of the
highest compression pressure are normal [B].
If one or more of the cylinders show a low reading, put
1/2
oz.
(14
,
75
ml) of oil
in
the low reading cylinders and make
the compression test again.
If there
is
a lot of increase in the compression, the piston
rings are worn.
Revised
Oct. 97
B
Maximum
PSI
134
136
138
140
142
144
146
148
150
152
154
156
158
160
162
164
166
168
170
172
174
176
178
180
182
184
186
188
190
192
194
196
198
-7B-2-
Minimum
Maximum
Minimum
PSI PSI PSI
101
200 150
102
202
151
104
204
153
105 206 154
107 208 156
108 210 157
110 212 158
111
214 160
113 216 162
114
218 163
115
220
165
117 222 166
118 224 168
120 226 169
121
228
171
123
230 172
124 232 174
126 234 175
127 236 177
129
238 178
131
240 180
132 242
181
133 244 183
135 246 184
136 248 186
138
250 187
140
141
142
144
145
147
148
741,742,743,
743DS
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