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Repairs to Engines and Boats BOAT means "Break Out Another Thousand" to many of us. Discuss your engine and hull repairs here.

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Old 07-18-2015, 12:18 PM   #1
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Join Date: Nov 2006
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need question on yamaha 90 outboard answered

my friend has a 2002 90 yamaha outboard and his buzzer goes off at idle.. we changed water pump, thermostat and checked inside the outside plate on head for blockage.. nothing...my question is what is the temperature that the heat sensor makes the buzzer go off.. its the one on the starboard side of the head with a rubber bushing around it..
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Old 07-23-2015, 08:48 PM   #2
cheetah chrome
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Re: need question on yamaha 90 outboard answered

Thermoswitch spec is alarm on (continuity) at 183-194F then alarm off (open) when sensor cools down to 140-165F.

Check the poppet valve (pressure relief valve) to see if it is stuck open. If so can cause overheating at idle/low RPM.

Last edited by cheetah chrome; 07-23-2015 at 09:14 PM.
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