Oil and Mix for 1916 Koban

[limnos]

Finished my working restoration of my 1916 Koban. Intend to try running at Tomahawk. What would be the best oil to use for the mix and what ratio? I have never run a Koban before. Restored it to be a “runner”, new gaskets, corn head grease on water pump gears, etc.

• This topic was modified 3 years ago by Mumbles.

[bobw]

Well, I couldn’t tell you what the oil mix is, but I can tell you that is one of the most OUTSTANDING antique restoration projects I’ve seen! I would be afraid to use it! Congrats on a magnificent job.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."

[lloyd]

It’s beautiful!!!!!

[BROOK E. NEWCOMB]

Excellent job looks Great!

I have a 1915 Koban 1/2 pt per gallon has served it well.
I like Pennzoil two cycle tcw 3

Opinions will vary.

Respectfully,

• This reply was modified 3 years ago by BROOK E. NEWCOMB.

1 user thanked author for this post.

limnos

[Mumbles]

I think I was once told they like a heavy mix, like 8:1, as they have iron pistons running in iron cylinders. Not sure.

[BROOK E. NEWCOMB]

Nice to see another one with underwater exhaust!
I have a 1918 with underwater exhaust an option
That you rarely see.

Respectfully,

• This reply was modified 3 years ago by BROOK E. NEWCOMB.

[pm-t2]

Beautiful motor. You can run it with the fuel/oil mix as Brook suggested.

I myself prefer to run these at 8:1, but that’s just my personal preference/prejudice.

Hope it helps.

Best,
PM T2
Kobunn Special Interest Group Leader

1 user thanked author for this post.

limnos

[george-emmanuel]

You will find that you’ll need an extra large amount of space to turn the boat when underway, and even then, it may not turn where you want it to go. When the rudder is turned, the prop wash bypasses and goes straight out making it difficult to turn. Wasn’t a real efficient design, but the motors run well! Beautiful restoration!

George

[limnos]

Thanks for the info. In the past, I was told I might want t use 4 stroke oil (As they did in the period), but two stroke is OK? I assume non-synthetic? I have heard synthetic is just too thin for these older motors.

[limnos]

I know you need a buzz coil for each cylinder, but do you also need a separate battery for each buzz coil, or can you run them both off a single battery. 6v lithium type?

[Author]

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