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Outboard engine annual service

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Bruce Baker
Captain

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USA
402 Posts

Initially Posted - 03/14/2005 : 12:15:44

I've got a new second hand Yamaha 8 outboard. What do I need to do to get it ready for the season? Hopefully, we'll get some spring around here soon. It's forty one at National Airport right now.

Thanks,

Bruce Baker
Falls Church, VA
"Yee Ha" 3573
'83SR/SK

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At Ease
Admiral

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672 Posts

Response Posted - 03/14/2005 : 13:44:40

I assume you did not get a manual with it. If not, you might want to see if you can find one...Yamaha manuals are pretty good. I used to have the same motor, so I'll get you started:
-If kept is salt water, get some rabbit ears and flush it good.
-Change the plug(s), one or two, cannot remember.
-Drain and change the foot oil...you can get a small pump at Walmart that will force the new fluid up from the bottom.
-Remove the prop and lub it...white grease.
-Lub everything that moves.
-Wax all metal/plastic parts, including gas can.
-Armorall (or similar) all rubber parts, including gas hose.
I've probaby forgotten something, but somebody will pick up on it.
Have fun.

Edited by - on

lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts

Response Posted - 03/15/2005 : 08:31:14

If the telltale nozzle is only putting out a small, weak dribble of water, you will need to replace the water pump impeller, and maybe the thermostat too. The impeller could be missing at least one or two vanes. The thermostat is more likely to be clogged up if the engine has been used in salt water and not regularly flushed with fresh water. If the engine has been used in salt water and it has a charging coil (alternator), you will probably need to clean corrosion off of the connectors, and run new wire from the motor to your boat battery. Test the circuit with a voltmeter to see if the alternator is actually putting out any current. Assuming the flywheel has a charging coil hidden under it, it should put out approximately 14.8 volts / 5 amps at 5000 rpm. If there is no apparent power coming from the motor, and you have cleaned all corroded wiring connections, then the likely culprit is the AC-to-DC bridge rectifier; the diodes are fried, and the rectifier will need to be replaced.

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Admiral

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672 Posts

Response Posted - 03/15/2005 : 13:18:36

The only trouble I ever had with my Yamaha (fresh water only) was it quit blowing water due to a bad impeller. Depending on the age of the motor, might be a good idea to change it.

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.