Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

[Fisnfool]

I have a 1965 Starcraft Holiday with a 110 hp Merc. I/O.

I am going to put a 2 cycle 1974 Evinrude 9.9 on the stern as a kicker.

A friend told me that I do not have to install a separate fuel tank for the kicker.

He said mixing 2 cycle oil in the main fuel tank and running it in the Merc. inboard will not hurt the engine.

I use TCW3. It seems to me that using 2 cycle oil in the main engine fuel would at least carbon up the spark plugs. And at worst carbon the cylinders and jam the piston rings resulting in engine damage.

I do decarb both engines after 50 hrs. as part of normal maintenance. I relay do not need to get a new kicker, this 1974 Evinrude was only used two seasons by my Dad then fogged and stored when he switched to fishing from a canoe.

I had to start it each year then fog it and put it back in storage for "MY future use." I inherited this motor 2 years ago and it runs great.

Is it really possible to use one fuel tank for both engines?

 

[Dunaruna]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

Possible, yes. But I would only do it in an emergency (if the i/o tank ran dry). All the reasons you listed are valid.

It is also a good idea to have two separate fuel delivery systems in case of water contamination.

 

[bigbob_FTW]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

sure its possible, but I would never do such a thing. your friend is giving you very bad advice.

 

[mthieme]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

I would not do that either. At the very least, expect some fouled spark plugs.
A 2 stroke and a 4 stroke have totally internal lubrication systems.

 

[xtraham]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

if you had a couple of xtra gallons of pre-mix you didn't want to throw away and dump in the tank that would be OK, but to fully mix the fuel to run a 2 stroke.. nope, it will 'nasty' up the 4 stroke engine in a short period, it will smoke and gunk up everything; not to mention everything you said also. 2 tanks are not an option, it's a must.

 

[alumi numb]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

well i guess nobody here knows 2 stroke oil.
it's ashless thus designed to burn, 2 strokers have spark plugs also.
the fact is a little is a good thing in a 4 stroke now and then.
lubes thing up and saturates the existing carbon in the combustion chambers burning it off.
many diesel owners will swear by it, i run it every tank full.
however i agree with the thought that a steady diet of it wouldn't be good.
not in that high of a ratio anyway.
tell your buddy not to give advise when he's smoking that stuff.

 

[Bondo]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

I use TCW3. It seems to me that using 2 cycle oil in the main engine fuel would at least carbon up the spark plugs. And at worst carbon the cylinders and jam the piston rings resulting in engine damage.

Ayuh,.... I agree with the above posts,...

In an Emergency it would work,...
But it'll gum things up as a regular diet...

Get a seperate tank for the kicker.......

 

[Fisnfool]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

Thanks All,

It did not make sense to me either.

But I firmly believe that the only stupid question is the one not asked. There is always something new to learn.

 

[chiefalen]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

Diesel's are a different dog all together.

The 9 hp kicker needs it's own tank and if your using it only in emergency's, carry 6 gallons in a external container already mixed, or with the oil in the bottle and mix it onboard, that way you can pour it in your main gas tank, and get fresh everytime you go out.

Your 9 hp kicker needs a new impeller if it sat more then 3 years. I strongly suggest you change it out before you go on the water with it.

Good luck !

 

[Fisnfool]

Re: Can 2 cycle oil be mixed in fuel also used for Merc inline 4 110hp ?

Thanks for the tip.

I actually replaced all the seals, impeller, and the fuel pump before putting it back in use a couple years ago on a 14 foot row boat.