Yamaha 40V - Service Points; Fuel Enrichment Pump Inspection; Fuel Enrichment Valve Inspection

4-13
FUEL
E
PRIME STARTER
SERVICE POINTS
Fuel enrichment pump inspection
1. Inspect:
● Body
Crack/Leak/Damage → Replace.
2. Inspect:
● Seat valve
Crack/Distortion → Replace.
3. Inspect:
● Diaphragm
Damage → Replace.
Fuel enrichment valve inspection
1. Inspect:
● Needle valve 1
● Piston valve 2
Wear/Bend/Damage → Replace.
2. Measure:
● Fuel enrichment valve resistance
Out of specification → Replace.
NOTE:
When measuring the resistance of 10 Ω or
less using the digital tester, the correct
measurement cannot be obtained. Refer to
“Lower resistance measurement” section in
chapter 8.
3. Measure:
● Piston valve height a
No change → Replace.
Fuel enrichment valve resistance:
Blue - Black
2.32 ~ 3.48 Ω at 20˚C (68˚F)
Checking steps:
● Connect the 12 V battery.
● Wait for several minutes.
● Check the piston height.