1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 262Get this manual
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IPOWR I& I
1 Inspect: -GrommetG) -Valve -Spring CrackedWornDamaged-4 Replace
Thermostat
1 Inspect:StuckDamaged-4 Replace2 Measure:Valve opening temperatureValve lift Ou