Yamaha 4HP two stroke - manaul and two stroke oil...

Fantasie 19

Well-known member
Joined
23 Mar 2009
Messages
4,464
Location
Chichester, West Sussex
Visit site
Hi - I am the proud owner of a Fantasie 19 "Papillon" which came with an old (age unknown but I suspect 10 years +) Yamaha 4HP two stroke with long shaft...

Being on a steep learning curve I knew that I needed 2 stroke oil to mix with the fuel - first question to you learned types - will standard Halfords 2 stroke oil do - this is labelled for all domestic/horticultural and gardening two strokes???

Next - any idea where I might find a manual for my outboard? I suspect the fuel mix needs to be 100:1 but I'd like to check...
 

WF36

Well-known member
Joined
28 Jan 2009
Messages
1,156
Location
Suffolk
Visit site
does it not say on the engine?
I would of thought its 100:1 but I would wanna check first not sure where you can get manuls
 

Nigel_Ward

Member
Joined
7 Nov 2001
Messages
419
Location
East Yorkshire
Visit site
I think it is worth buying the correct marine grade as the extra cost is minimal compared with the cost of the petrol. There is some standard for marine grade oil but I am not sure if it is a standard for the engine or the environment.

I have 6hp Yamaha of 1995 vintage and it uses 100:1.

The local outboard repair man where I sail told me to use the correct mix of oil and not be tempted to put in more.
 

VicS

Well-known member
Joined
13 Jul 2002
Messages
48,364
Visit site
You can access the owners manual to read online from HERE although the site is really for models sold in the USA. I am unaware of a similar site for the UK!

But first you will need to identify the year. You should be able to do that from THIS WEBSITE

If necessary look at what you think might be the manual for yours and you will find an illustration of the plate on the transom bracket that gives model/serial numbers and the year letter.

Yamaha seem to have managed to continue with 100:1 fuel mixes while the main American makes returned to 50:1 mixes.

I think you will find that Yamaha actually recommend 50:1 for the commercial versions of their engines. If you use 100:1 measure the oil sufficiently accurately to be sure you do not use a thinner mix than 100:1.

And yes do use an outboard engine oil to TCW-3 specification. The oils for gardening machinery are formulated for air cooled engines not cooler running water cooled outboards. TCW3 is also biodegradable. Your choice though whether to buy a mineral oil or pay more for a synthetic one.

Later:

If this is all new to you I strongly suggest that you check and/or replace your gear box oil. Any signs of milkiness indicates water ingress which will need rectifying.


Also if you are not aware when it was last changed consider replacing the water pump impeller, or at the very least keep a good eye on the cooling. I assume yours has a "pee hole" telltale.
 

lw395

Well-known member
Joined
16 May 2007
Messages
41,951
Visit site
Very few outboards die of engine wear, so I don't think the oil is super critical.
I had an older Yam 4 (mariner badged) which was 50:1
I tend to use semi synth motorcycle 2T oil.
I also run my 2hp yam at 66:1 instead of 100:1 without any problems, but then it gets used quite hard, more often with a tender its really too small for than with the inflatable.
Always carry a spare spark plug and tools to change it, and if you get repeated short plug life, change oil and/or plug brand.
 

liam12504

New member
Joined
5 May 2009
Messages
4
Visit site
hello i have just bough a yamaha 4hp outboard and i am new to these. i see at the bottem of the shaft near the propella there is to screws with oil level written next to them so i suspect they are for the gearbox oil level. Do you no what oil to use for this and where u fill the gearbox oil up and are these water cooled, my contact email is liam12504@hotmail.com, thanks for you help
 

VicS

Well-known member
Joined
13 Jul 2002
Messages
48,364
Visit site
Hi and welcome.

Correct oil will be an outboard engine gear oil.
An oil around SAE 85 or 90 in viscosity to GL5 spec but containing additional corrosion inhibitors to guard against the effects of water ingress.

With the engine upright remove both screws to drain the oil. If any signs of water or milkiness then there is probably a seal gone which should be replaced.

Refill via the bottom hole until oil flows from the top one, using a squeezable bottle or a pump that fits the hole (Yamaha accessory)
Refit the top screw, remove the pump and refit the lower screw.

You should use new seals on the drain and level screws.

Water cooled as far as I know and expect. You dont give the year so cannot look anything up.

Although strictly for American sold models you may be able to find an owners manual HERE if more recent than 1998. That will tell you the location of the telltale if any.

Not a smart idea to put you email address on the forum, suggest you delete it if not too late.

Would also have been good etiquette to have started a new topic of your own rather than resurrecting an old one started by someone else.
 

liam12504

New member
Joined
5 May 2009
Messages
4
Visit site
Thankyou for your help i did find the oil milky, do you no where i could buy this seal and what type of seal is it called many thanks
 
Top