2 stroke

thornbackflound · 22 September 2009, 18:51

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?

codprawn · 22 September 2009, 19:01

Engine will last longer if it's 50:1 - plugs will last longer with 100:1

thornbackflound · 22 September 2009, 19:17

Quote:

Originally Posted by codprawn

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

codprawn · 22 September 2009, 19:44

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

Locozodiac · 22 September 2009, 20:36

Quote:

Originally Posted by codprawn

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

thornbackflound · 22 September 2009, 20:46

Quote:

Originally Posted by codprawn

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

chewy · 22 September 2009, 20:56

Quote:

Originally Posted by Locozodiac

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

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.

codprawn · 22 September 2009, 21:06

Quote:

Originally Posted by Locozodiac

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!!!

auluslesbains · 23 September 2009, 15:43

Quote:

Originally Posted by Locozodiac

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?
:-)
Lyle

m chappelow · 23 September 2009, 19:40

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 ,

Locozodiac · 24 September 2009, 21:09

Quote:

Originally Posted by codprawn

Many do - it all depends what country you are in. It is for environmental reasons rather than anything else!!!

We have imported modern 2 strokes Mariner/Tohatsu engines from USA, Panama, Japan and all their manuals stated 50:1 ratio, so for this brand, the geographical / environmental location is not an issue for going 100:1. For the moment, will stick with usual 50:1 untill there is a factory bulletin specifying so. Consult your owners manual for your 2 strokes engine brand before going 100:1 or repent forever for experimenting.

Happy Sibbing

phillnjack · 26 September 2009, 17:33

Many yamaha's of the 1970's and 1980's had 100 to 1 printed on the side of the engines
just below the hoods in white letters.

To be honest i think 100 -1 is asking for a meltdown if running for long periods.

personaly i would stick to 50-1, and use a good quality 2stroke oil.

phill