Normal for a two stoke with flush muffs?

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firstascent2002

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Just seems like a lot of oil to me? But never used flush muffs with a two stroke before. This picture was taken 10 mins after the engine had been run up for 15.
 
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No doesn't seem right. Can you identify if it is two stroke oil or gearbox oil? Gearbox oil tends to have a much more pungent smell and be thicker. If the former, the oil/fuel mixture is way too rich and the engine can't burn it properly. If the latter you have a damaged gearbox seal around the propeller shaft somewhere. You always tend to get a little more oil discharge when running on flush muffs as the engine is not under load so doesn't warm up properly and tends not to completely combust the two stroke oil (hence why two strokes have become the pariah of the outboard market).
 
My hope is that is not gear box oil because the engine was in neutral all the time.


The fuel is rich at about 1:40 as that is what I winterise with

Humm....really hoping not to have to open the gear box but thing I might have to!
 
40:1 is very rich, what engine is it? You should run at normal ratios 100:1 most likely, and then use fogging oil (quicksilver) to winterise: squirt directly into the carbs (take off the air filter) whilst running until the engine stalls. This coats all the internals. When you come to recommision, take out the plugs and clean them, use clean 100:1 fuel, get it started and apologise to the neighbours for the clouds of blue smoke as the fogging oil burns off.

I suspect your mixture is the issue. However, check the gearbox oil levels by removing the top filler screw and seeing if the oil is up to the top. If not, remove the drain screw, drain out, refill with gear lube and keep and eye on it. If there is any milkyness in the oil, you need to strip the gearbox, but if that is gearbox oil, it doesn't look as though this is the issue

Best wishes

Piers
 
That's a Mariner isn't it?

With a 40:1 mix odds are that it's no more than exhaust oil.
If you take the prop off you may be able to see where it has come from. I wouldn't be stripping the gearbox just yet.
 
pierscovill said:
40:1 is very rich, what engine is it? You should run at normal ratios 100:1 most likely,
Piers
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Is there any manufacturer who recommends 100:1
Some did suggest it for a while but reverted to 50:1 after problems developed. Commercial version of engines never recommended 100:1.
 
50:1 is most likely the correct ratio, and anyway a safe mix for any engine produced since the late 1960s

See the owners manual.
What make engine? there may be a manual on line if you do not have one. There will be if its a Merc or a Mariner

The oil looks normal to me. It is almost ceratinly partly burnt oil from the fuel.

If it is gear oil it will stink like rotten cabbages.

You will be changing the gear oil anyway. If it is milky looking then you will need to replace the gearcase seals .
If it is still "clear and bright" then all is well.

For some more detailed info and guidance see this item on the iBoats forums
http://forums.iboats.com/showthread.php?t=207285

.
 
Lakesailor said:
Is there any manufacturer who recommends 100:1
Some did suggest it for a while but reverted to 50:1 after problems developed. Commercial version of engines never recommended 100:1.
Click to expand...
I think you're right there - most grudgingly agreed you could run on 100:1, but privately recommended nearer 50:1.

Not a good idea to winterise with a high-lubricant mix - far better to inject a lot of fogging oil into the carb intake - results in gummed rings and stuck reeds (apart from a glutinous mass in the carb bowl which means a strip and clean when you want it to start).
 
MasterTech Marine say:
My manufacturer recommends 100:1 mix. Is that enough oil?
Absolutely NOT! DON'T DO IT! That's plenty to lubricate the motor under IDEAL conditions with a HIGH QUALITY 2 cycle lubricant. The problem comes after use - the lack of adequate oil for storage on the internal bearings, rings, and cylinder walls leaves your motor wide open to IMMEDIATE internal damage, and shortened service life.
Click to expand...

Possibly a bit alarmist.

A quick Google and visit to iBoats forum suggests that Yamaha is the only one to recommend 100:1

Some sound advice from various quarters is to run at 75:1. Not as over-oiling as 50:1 but will allow for "mistakes" made during mixing.
 
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It is one of those myths that you should run *modern* 2 strokes on a richer mixture that the recommended 100:1. The latest TCW oil specs and bearing quality are so good that these engines don't need a richer mixture and indeed find it hard to digest properly, leading to problems with fouling plugs etc. it is true commercial engines often run at 50:1 but they are also detuned versions, developing more power in the mid and lower ranges, and often previous generation models (as in the case of the Yamaha Enduro range). Having said this, i do accept that the OP's engine may be of a certain age, and might need 50:1 - he has not confirmed either way.
 
That is another point. If you don't use one of the more expensive 2 stroke mixers you may be short-changing your motor.
Is there another manufacturer, other than Yamaha, who suggest 100:1 ?
 
I ran a Mariner 8hp on the recommended 100:1 for over ten years. Never bothered with special oils either, frequently using cheap stuff from our local agricultural supplier. Never had a problem

I still run my 3.5 engine on 100:1.
 
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