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48
7-4 Testing crankcase and cylinder seal
A
Close
C
F
E
B
Open
D
G
ENGINE
1. Remove muffler.
2. Set Pressure rubber plug 91041 (D) on muffler
to cover exhaust port as shown.
3. Reinstall muffler with Pressure rubber plug
91041 (D) on cylinder to seal exhaust port. Secure
them with 4 muffler bolts.
3. Remove decompressor from cylinder. Confirm
valve on decompressor is closed. If not, push the
valve to close it.
NOTE; When carbon deposits are accumulated
around valve of decompressor, remove the depos-
its or replace with new one as required. (Refer to
"7-5 Inspecting decompressor").
4. Reinstall decompressor.
5. Remove carburetor (Refer to "4-5 Removing
carburetor, fuel line and tank").
6. To seal intake port, set Pressure rubber plug
897826-16131 (C) and Pressure plate 897827-
16131 (D) on intake port. Tigten them with M5
bolts (E) of 10 - 15 mm (0.4 - 0.6 in) length.
7. Connect pulse line (F) and Pressure / vacuum
tester 91149 (G) with suitable joint.
8. Apply negative pressure approx. 0.03 MPa (0.3
2
kgf/cm
) (4.3 psi) by the tester (J) and leave for 30
seconds.
9. If the pressure decreases, leakage may occur
from oil seal. Inspect oil seal for damage or wear.
10. Apply pressure approx. 0.05 MPa (0.5 kgf/cm
(7 psi) by the tester (G) and leave for 30 seconds.
11. If the pressure drops, leakage may occur.
12. Leakage may occur from crankcase seam, cyl-
inder base, oil seal or decompressor. Use soapy
water to locate leakage.
CSG-7410ES
EC741S
2
)
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Troubleshooting
