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 outboard mixture question		  New Topic  Topic Locked
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newell
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USA
113 Posts
Initially Posted - 05/25/2007 :  05:42:41  Show Profile
I have just acquired a 1980 Johnson Saildrive OB and am wondering about the oil/gas mixture. I am gussing 50:1 or 12oz oil to 5 gals of gas......would this be correct??

newell
Newell
1980 C25 SR/SK
AVALON
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Champipple
Master Marine Consultant

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USA
6855 Posts
Response Posted - 05/25/2007 :  06:36:49  Show Profile  Visit Champipple's Homepage
50:1 sounds correct
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 05/25/2007 :  07:48:07  Show Profile
I've had two Johnson Sailmasters one, a 1990 six hp used 100/1 mixture and the 1993 9.9 hp used 50/1. I suppose it is safe to go with 50/1 until you contact Johnson and find out which they reccommend.

Val on Calista, # 3936, Patchogue, N.Y.
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DaveR
Master Marine Consultant

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USA
2015 Posts
Response Posted - 05/25/2007 :  07:57:43  Show Profile  Visit DaveR's Homepage
<b>12.8</b> oz to 5 gals. I usually go 13 oz, better a bit more than less I think
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dlucier
Master Marine Consultant

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Virgin Islands (United Kingdom)
7583 Posts
Response Posted - 05/25/2007 :  08:12:49  Show Profile
The 1979 Johnson that was on my previous boat used a 50:1 mix.
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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 05/25/2007 :  16:43:51  Show Profile  Visit Frank Hopper's Homepage
My understanding is that the 100:1 was an experiment to reduce smoking, it caused accelerated engine wear and that there was a Tech Note from OMC that instructed that all engines regardless of age or what was written on the engine should return to 50:1
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 05/25/2007 :  21:14:41  Show Profile  Visit delliottg's Homepage
Yep, my '97 Sailmaster 8hp is 50:1.
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Jay Schkloven
1st Mate

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USA
84 Posts
Response Posted - 05/26/2007 :  10:20:56  Show Profile
I also have a Johnson 9.9 and mix a 45 - 1 ratio. My plugs do not get oil covered and it only smokes at initial startup. I would rather see a bit of smoke than a bill to repair. 12 ounces is a bit light. 14 ounces would do the trick.
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Downbucket
Navigator

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USA
188 Posts
Response Posted - 05/27/2007 :  15:52:32  Show Profile
West Marine makes a great mixture bottle with oil-level marks to help mix precise ratios of oil to gas. Price is $4.99. I use it all the time. Go to West Marine on line and in the search box type "oil-to-gas mixture measure."

Will
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.