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Old 29 April 2011, 15:56   #1
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what 2 stroke mix to use?

Hi sorry for asking this cos it will probably sound daft to most you guys!
Ive just got a 40 hp mariner 2 stroke looks late 80`s early 90`s and not sure what the mix would be?
The guy i got it off said 100-1?
so what would 100-1 be in ml-litres measurments?
when i used to have motorbikes i used to put 25 ml to every litre, Any help would be greatly appreciated.
Many Thanks
Richie
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Old 29 April 2011, 16:04   #2
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Hi mate and welcome, if its 100 to 1 a 22ltr tank will take 1/2 ltr of oil
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Old 29 April 2011, 16:29   #3
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100-1 would be 10ml per litre, i have always used it a bit stronger than that, has not done any harm
220ml in a 22ltr tank would be 100-1, half a litre is probably what i would stick in it
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Old 29 April 2011, 16:36   #4
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1 litre = 1000 millitres, so 100 to 1 mix makes it 10ml per litre.

Just make sure its 100:1 as i think a few will say 50:1 is better for the engine but others on here will clarify that.

Make sure its a decent marine outboard oil too, only use TCW3 oil.
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Old 29 April 2011, 16:40   #5
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Thanks for that guys, ive read up and a lot seem to say 50-1 so i think ill pop up to the shop tomorrow and see if they can check for me just to be safe.
Thanks again
Richie
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Old 29 April 2011, 17:25   #6
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they were 50:1 despite being identical to the yamaha 40 which was 100:1,
My boating buddy had the yam and I had the mariner. We used to run both at around 50:1, on the grounds that if 100 was good then 50 is better.
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Old 29 April 2011, 17:39   #7
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yeh ive read a lot that the yams should be 50-1, really if i put 50-1 it cant harm it just make it a bit smokey!
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Old 29 April 2011, 17:49   #8
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Quote:
Originally Posted by geordie_richie View Post
yeh ive read a lot that the yams should be 50-1, really if i put 50-1 it cant harm it just make it a bit smokey!
Exactly, 50:1 will ensure the engine is getting all the lube it needs...... and it wouldnt be a two stroke without the smoke.
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Old 29 April 2011, 18:41   #9
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Is it a 2 cylinder or a 3 cylinder?

2cyl is a Yamaha based motor and is 100:1, 3cyl is 50:1
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Old 29 April 2011, 18:43   #10
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Hi mate and welcome, if its 100 to 1 a 22ltr tank will take 1/2 ltr of oil
No it's not-that's 44:1 if you use 1/2 litre to 22 litres.
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