Logo
FULL SITE MENU

oil/fuel mixture

J

Julian Stigter

New member
I just bought a 15 hp johnson 2 stroke from 2002 (it was repainted so the exact model number is unkown to me)
Anyway my dealer told me to me to mix 1:100 a google search later i found a manual from a 2004 model wich said i should mix 1:50 i currently mix 1:50 just to be sure, does anyone know how much to mix
 
mix at 50:1 for long engine life.-------They run quite nicely on 100:1 but you may be shopping for a new motor a bit sooner.
 
No it would not be.-------it is abundantly clear to me that the lubrication of 2 stroke outboards is confusing for many folks.---What happens to the oil once it reaches the venturi in the carburetor is just not understood !!!!
 
racerone said:
No it would not be.-------it is abundantly clear to me that the lubrication of 2 stroke outboards is confusing for many folks.---What happens to the oil once it reaches the venturi in the carburetor is just not understood !!!!
Click to expand...

Please explain...this has my interest as well...If it will run on 50:1 and run on 100:1 why wouldnt 70:1 be ok?
 
Motors from the 1950's ran on 24 : 1 and many still run like new.----They used more fuel and that fuel had more oil in it.--------Parts got plenty of lubrication !!!------I have taken a number of motors apart that were run on 100:1 and it is not hard to tell that there is not enough oil to prevent wear on critical parts.-----------The oil is not needed for the engine to run !!!-------It is needed to lubricate the parts.----Remember that the oil and gas seperate once it goes through the carburetor.------I say it again the lubrication of 2 stroke engines is not well understood.----Newer Mercury high performance / racing engines run at 32:1
 
Last edited:
Other than the dealer, have you seen it anywhere that 100:1 is ok? OMC said 100:1 briefly in the late 1980s but then told everybody to remove the sticker and run 50:1. 100:1 was a mistake. The oil does more than just lubricate it, it also provides rust protection once you shut it down.
 
Back
Top