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Old 22 September 2009, 14:51   #1
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2 stroke

Hi all ,well my memorys slipping ,i can t remember how much 2 stroke oil i mix to a 5 litre can of petrol ,o/b is a marinar 3.3 i have been adding 100mm oil mix to a 5lt can of petrol is this right,i beleive 50:1 mix ?on tank think it says 100:1,but under the impression 50:1 is fine?
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Old 22 September 2009, 15:01   #2
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Engine will last longer if it's 50:1 - plugs will last longer with 100:1
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Old 22 September 2009, 15:17   #3
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Originally Posted by codprawn View Post
Engine will last longer if it's 50:1 - plugs will last longer with 100:1
cheers mate,so would i put 50mm of oil to 5 litres of petrol? i would rather the engine last longer then the plugs
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Old 22 September 2009, 15:44   #4
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So would I - you need 100ml of oil for 5 litres - this gives you 50:1.

Here ia a handy little calculator if you are messing with different ratios - litres at the bottom.

http://www.csgnetwork.com/oilfuelcalc.html
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Old 22 September 2009, 16:36   #5
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Originally Posted by codprawn View Post
Engine will last longer if it's 50:1 - plugs will last longer with 100:1
Has anybody used 100:1 gas/oil ratio for a long time instead 50:1 ratio mostly used on 2 strokes engines ? What was the result ? If you can use 100:1, why are outboard manufacturers not specifying so in the owners manuals ?

Happy Sibbing
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Old 22 September 2009, 16:46   #6
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Originally Posted by codprawn View Post
So would I - you need 100ml of oil for 5 litres - this gives you 50:1.

Here ia a handy little calculator if you are messing with different ratios - litres at the bottom.

http://www.csgnetwork.com/oilfuelcalc.html
Cheers mate,its come back to me now ,thats the rtatio i have been using got a baby bottle and i remember now filling it 100ml ,just been a while and i am getting forgetfull in my ole age ,lol,thanks again mate
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Old 22 September 2009, 16:56   #7
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Has anybody used 100:1 gas/oil ratio for a long time instead 50:1 ratio mostly used on 2 strokes engines ? What was the result ? If you can use 100:1, why are outboard manufacturers not specifying so in the owners manuals ?

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I thought Suzuki did years ago.
I know I was told you can run 50:1 on one 2 stroke oil and 100:1 on higher spec oil.
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Old 22 September 2009, 17:06   #8
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Has anybody used 100:1 gas/oil ratio for a long time instead 50:1 ratio mostly used on 2 strokes engines ? What was the result ? If you can use 100:1, why are outboard manufacturers not specifying so in the owners manuals ?

Happy Sibbing
Many do - it all depends what country you are in. It is for environmental reasons rather than anything else!!!
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Old 23 September 2009, 11:43   #9
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Originally Posted by Locozodiac View Post
Has anybody used 100:1 gas/oil ratio for a long time instead 50:1 ratio mostly used on 2 strokes engines ? What was the result ? If you can use 100:1, why are outboard manufacturers not specifying so in the owners manuals ?

Happy Sibbing
Or why doesn't everyone just use 75:1 to get a balance between plug and engine life?
:-)
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Old 23 September 2009, 15:40   #10
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had a 2 hp yamaha that ran for years with no bother on 100/1 though i still put a tad extra oil in ,,especially as i had been brought up with an old seagull running at 10/1 lol,and other engines running on 50/1,, doing the fuel mix was like a surgical operation ,,always had visions of it siezing up though i never had any problemswith it ,
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