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Old 02 November 2014, 06:30   #1
MrHeadsocket's Avatar
Country: UK - England
Town: Littlehampton
Boat name: Warrior
Make: Wetline
Length: 4m +
Engine: Yamaha 30HP Autolube
Join Date: Aug 2014
Posts: 116
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Winterising an Outboard

I have a Yamaha 30 (30DMO) that is going into storage soon and I don't want to go to fire it up next year to find it siezed up! It's just had a service (about 3 weeks ago) and it had a new impeller, set of plugs, new Yamalube oil (it's an Autolube) and I believe new lower unit oil and since then it's been out twice. So what should I do to winterise it? :what:

Cheers in advance! (Just thought I'd attach two photos from Thursdays trip from Littlehampton Harbour!)
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Old 06 December 2014, 02:17   #2
Country: USA
Town: Santa Cruz, CA
Boat name: Ginger
Make: Zodiac Mark II
Length: 4m +
Engine: Mercury 40hp
Join Date: Feb 2014
Posts: 35
Hi there,

I'm just about to do the same thing with my Merc 45. I'm curious what steps I need to take, if any specifically on the motor. I've got the battery hooked to a trickle charger so I should be set there. I'm also curious what to do about the 1/2 full tank of gas, I've heard it can go stale or similar.

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Old 06 December 2014, 03:21   #3
The Gurnard's Avatar
Country: UK - Scotland
Town: Stirling
Boat name: The Gurnard
Make: Quicksilver
Length: 4m +
Engine: mariner 25hp 2s
Join Date: Jul 2013
Posts: 1,274
Hi Ninja,
If you are doing your own winterising and perhaps servicing.. I would advise getting hold of a manual for your engine. There are plenty of links for various manuals on the internet and also on this forum. They appear to be “free manuals”

In my owners manual for my outboard..and I got it free from the manufactures site..below is what it tells me to do. I don’t know what is best for your engine.. it may be the same..but with a work from yourself.. I think you will find what your engines manufacturer recomments ?

Hope that at least helps some

Out-of-Season Outboard
As a safety precaution, when boat is in storage,
remove positive (+) battery cable. This will eliminate
possibility of accidental starting of engine and resultant
overheating and damage to engine from lack of
In preparing an outboard for out-of-season storage, 2 precautions
must be considered: 1) The engine must be protected
from physical damage and 2) the engine must be
protected from rust, corrosion and dirt.
1. Remove cowling from engine.
2. Place outboard in water or install Quicksilver Flushing
Attachment over water intake by following instructions
outlined in “Flushing Cooling System” (see “Table of
3. Start engine and allow to warm up. Disconnect fuel
line. When engine starts to stall quickly spray Quicksilver
Storage Seal into each carburetor throat. Continue
to spray until engine dies from lack of fuel.
4. Remove spark plugs and inject a 5 second spray of
Quicksilver Storage Seal around the inside of each cylinder.
Manually turn engine over several times to distribute
Storage Seal throughout cylinders. Reinstall
spark plugs.
5. If engine fuel filter appears to be contaminated, remove
and replace. Refer to Section 3 “Fuel System
and Carburetion.”
6. Drain and refill lower unit with Quicksilver Gear Lube,
as explained in “Gear Housing Lubrication” (see “Table
of Contents”).
7. Clean outboard thoroughly, including all accessible
powerhead parts, and spray with Corrosion and Rust
8. Refer to lubrication chart in this section (see “Table of
Contents”) and lubricate all lubrication points.
9. Remove propeller. Apply Quicksilver Special Lubricant
101, Anti-Corrosion Grease or 2-4-C Marine Lubricant
to propeller shaft and reinstall propeller. Refer to
“Propeller Installation” (see “Table of Contents”).

IMPORTANT: When storing outboard for the winter, be
sure that all water drain holes in gear housing are open
and free so that all water will drain out. If a speedometer
is installed in the boat, disconnect the pickup tube
and allow it to drain. Reconnect the tube after draining.
Trapped water may freeze and expand, thus cracking
gear housing and/or water pump housing. Check and
refill gear housing with Quicksilver Gear Lube before
storage to protect against possible water leakage into
gear housing which is caused by loose lubricant vent
plug or loose grease fill plug. Inspect gaskets under
lubricant vent and fill plugs, replacing any damaged
gaskets, before reinstalling plugs.
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Old 06 December 2014, 06:34   #4
Country: Finland
Town: Helsinki
Boat name: SR 5.4
Make: Avon
Length: 4m +
Engine: Toh1 3,5 Yam 90/2S
Join Date: Oct 2009
Posts: 919
I used to do that also, but have been advised by a Yamaha service mechanic that this is bad advice:
3***** Disconnect fuel line.******

Hi said that then the fuel pump works against the vacuum caused by disconnecting the whole line, can be bad for the pump.

So now i keep the line connector attached to the outboard but removes the hose from it, that way there will be no vacuum created. Don't know if this is a big issue but sounds logic anyway.
fun on a boat is inversely proportional to size...sort of anyway
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Old 07 December 2014, 03:23   #5
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,016
If the engine is being stored indoors then just spray some fogging oil into the cylinders through the spark plug holes and turn the engine over a few times with the kill switch off to distribute the oil...

Otherwise don't go mad and Don't run it out of fuel...

If you have some fuel left in the tank it will be fine until the new year / early spring however you can use fuel stabiliser to be sure.
Chris Stevens

Born fiddler
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Old 07 December 2014, 05:21   #6
dave3235's Avatar
Country: UK - England
Town: Bristol
Boat name: Salty Cheeks
Make: Honwave
Length: 3m +
Engine: 20hp 2stroke Mariner
Join Date: Mar 2014
Posts: 485

I would spray into the carb regardless of indoors or outdoors as gives a nice bit of lube on big and small end bearings for the first start up of the season no dry bearings,peace of mind.Also when running carbs dry give the fuel connection a push so it gets rid of the presure happy days.
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Old 07 December 2014, 09:53   #7
Country: USA
Town: Santa Cruz, CA
Boat name: Ginger
Make: Zodiac Mark II
Length: 4m +
Engine: Mercury 40hp
Join Date: Feb 2014
Posts: 35
Thanks for the info!

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