I have a 15 horse mariner, what is the mixture for gas and oil for this motor.

SOURCE: Blower was used with motor oil gas mixture. Any

I would have to say a re-build is in order for that 2-cycle motor. I'll bet the internals are all gunked up from using regular motor oil. Pull the muffler and look in the exhaust port while pulling the starter cord (WITH THE SPARK PLUG REMOVED), usually that is a 2 man job...anyway, look in the exhaust port and look at the piston, it should be shiny and smooth plus you should be able to move the ring with a screwdriver. If you can't move the ring or the piston looks anything other than shiny and smooth, you are going to have to tear it down and rebuild it. This is not that hard, 2-cycle engines are the easiest engines to work on. Let me know what you see and I can help you more.

Bob Korsu

• 1051 Answers
• Posted on Apr 11, 2010

SOURCE: oil and gas mixture

Mixture is typically 40 or 50 to 1, gas to oil. The exact mix should be stamped on the gas cap.

SOURCE: my 12.5 hp on my wheel horse starts and runs for about 15 seconds and then starts throwing what looks like a mixture of oil and gasoline out the carb and then stalls out

the needle valve in the carb is not seating replace the needle and seat and change the oil let it run without a load and change it again

SOURCE: what is the oil to gas mixture ?

50 to 1.

SOURCE: What is the proper gas /oil mixture for a 1979 Johnson sea horse outboard

Hi Paul:
My old Evinrude called for 32:1 and they were second cousins.
I'd bring spare plugs and a wrench as part of my "kit" if I were running an engine that old.
Better to run extra oil and not break it.
Cheers.