Yamaha F40BMHD Service Manual page 496

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ELEC
ENRICHMENT CONTROL SYSTEM
Measuring steps
(1) Connect a 12-V battery to the thermo
heater plunger.
(2) Measure the length of the projection
after applying power for five minutes.
Thermo heater plunger projection
maximum length:
14 - 15 mm (0.55 - 0.59 in)
8-33
E