2000-2005 Yamaha F40B Outboard Service Manual, Page 468Get this manual

2000-2005 Yamaha F40B Outboard Service Manual, Page 468

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IGNITION CONTROL SYSTEM
Mityvac YB-3595690890-06756

(3) Slowly operate the mity vac(4) Measure the continuity when the specified pressure is reached
MEASURING THE ENGINE COOLI