61U5H11
4-16
9
8
7
6
5
4
3
2
1
Fuel pump
Checking the fuel pump
1.
Place a drain pan under the fuel hose
connections, and then disconnect the
fuel hoses from the fuel pump.
2.
Connect the special service tool to the
fuel pump inlet.
3.
Cover the fuel pump outlet with a finger,
and then apply the specified positive
pressure. Check that there is no air leak-
age.
4.
Apply the specified negative pressure
and check that there is no air leakage.
5.
Connect the special service tool to the
fuel pump outlet.
6.
Apply the specified positive pressure and
check that there is no air leakage.
Disassemble the fuel pump if necessary.
Disassembling the fuel pump
1.
Disconnect the inlet and outlet hose from
the fuel pump.
2.
Remove the 2 bolts
1
securing the
pumps to the crankcase.
3.
Remove the 3 screws securing the pump
together. Refer to exploded diagram
P4-15.
NOTE:
Take care not to let the spring fly out or lose
the plate.
4.
Check the diaphragm for tears or deteri-
oration. Replace the diaphragm if neces-
sary.
5.
Check the valves for bends or damage.
Replace the valve if necessary. Also,
check the fuel pump body and spring for
damage. Replace the fuel pump body
and spring if necessary.
6.
Clean the fuel pump body.
6G440020
6G440010
6G440030
Vacuum/pressure pump gauge set:
90890-06756
Specified pressure:
50 kPa (0.5 kgf/cm
2
, 7.3 psi)
Specified pressure:
50 kPa (0.5 kgf/cm
2
, 7.3 psi)
Specified pressure:
30 kPa (0.3 kgf/cm
2
, 4.4 psi)
61U40030
1
1
61U5H11_04_1 06.2.13 4:09 PM Page 17
Содержание E115A
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Страница 256: ...YAMAHA MOTOR CO LTD Printed in Japan Oct 2005 1 2 1 E_1 Printed on recycled paper E115A 115B 140B ...