Older 18 horse Johnson Fuel Mix?

[Kenneth Brown]

I just bought an older 18 horse Johnson outboard. I am wondering the fuel ratio for it? I have the genuine Johnson oil with the TCW3 or whatever the spec is. I also have a synthetic oil that I use in my chain saw, weedeater, and did use in another boat motor (till it died at least), is this safe to use in my motor? It uses a what I beleive to be a 50-1 ratio, its got a squeeze type measure that dispenses 3.2oz for every gallon of fuel. Thanks for any help provided, Kenneth

 

[alcan]

Re: Older 18 horse Johnson Fuel Mix?

Hi Ken<br /> We need your model# so we can tell how older your motor is.

 

[JB]

Re: Older 18 horse Johnson Fuel Mix?

Hi, Ken.<br /><br />We will need your model number to recommend a fuel mix.<br /><br />Do not use TCW-3 oil in air cooled 2 strokes, or oil intended for air cooled engines in a water cooled outboard. The engines run at very different temps and have different viscosity and ash content requirements.<br /><br />Let us know your model number. Good luck.

 

[oldboat1]

Re: Older 18 horse Johnson Fuel Mix?

Use the TCW-3. 50:1 would be 2.56 oz per gallon, but you might need 30:1 or 40:1 if your motor is older than a '70s model.

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

Thanks guys. I just ran out and looked. It has FD-15 on the tag for the Model Number. i would appreciate any info you can provide about my motor also.

 

[alcan]

Re: Older 18 horse Johnson Fuel Mix?

Hi Ken<br /> Your motor is a 1961 model. The fuel/oil mix would be 24:1. A quart of oil to six gals. of gas will work fine.

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

Alcan- Are you sure this is right? I sure hope not. I ran it this morning on 50:1 and it died on me. It ran great for a while then it it just "surged" to a complete stop. It took about 1 seconf for the start of the surge till the end. I tried to restart but eneded up braking the rope on the second pull. I pulled the winder and wrapped the rope around and it turned over fine, you could even hear the compression "cough". Any advice?

 

[slow_boat]

Re: Older 18 horse Johnson Fuel Mix?

24:1 is right. How long did it run on 50:1? The TC3 oil is a better lubricator but I would not run one of the older engines @ 50:1 on purpose...others may disagree. I doubt if you have caused any real damage, what you describe sounds more like fuel starvation...the classic 'running out of gas' thing. Could be a clogged fuel line, carb, gas pick-up, etc. Check the fuel system from the tank to the engine.

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

Thanks slow boat, I hope you're right. It ran about 3 minutes in a barrel testing the water pump and just breaking in( it had been sitting for about a year with no use). I put it on my boat a few days later (this morning) and used it for about 8-10 minutes. After I get the rope fixed I will DEFINITELY use the 24:1 ratio. Any further advice on anything to do before starting it again?

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

I just thought about something else. It smelled kinda hot for a minute or two after it died but it spun over just fine. Once again any advice anyone has will be greatly appreciated.

 

[alcan]

Re: Older 18 horse Johnson Fuel Mix?

Hi Ken<br /> Unless you buy a used motor from a reputable dealer, and he says he has checked it out and service it, you really don't know what you have. Now there is nothing wrong with buying used from a private party. How ever you have to understand that you assume the task of checking and servicing. I would suggest that you obtain a manual and give your motor a thorough going over. From your last post it sounds as if you might need to service the cooling system including the water pump. The manuals will give you step by step testing and service procedures. And of course the folks on this board are always willing to help.

 

[Lark40]

Re: Older 18 horse Johnson Fuel Mix?

Your 1961 is a roller-bearing engine. It should be fine on 50:1 with a good brand oil, such as QuickSilver.<br /><br />My family had an Evinrude dealership back then, and the only change between the 1961 (24:1) and 1964 (went to 50:1) engines was the oil offerings, not the engine internals.

 

[steelespike]

Re: Older 18 horse Johnson Fuel Mix?

Lark40 is right on.<br />A 50 year E/J dealer told me motors with roller bearings back to 1960 can use 50:1 with tcw3<br />rated oil.Generally 18hp and up.

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

Thanks for the help guys. Alcan- The water pump seems to be working very well. It sprays out of the pisser about 2-3 feet. The previous owner seemed to take real good care of it. His shop looked terrible on the outside but was immaculate inside. There was no such thing as a cheap tool in his shop either, all Snap-on and Matco. He drag races and his car was very well detailed, everything in the right place. I'm gonna trust that he took good care of everything. If the weather ever gets nice enough again I'll let ya'll kmow how it turns out. Thanks again, Kenneth

 

[Tumpaa]

Re: Older 18 horse Johnson Fuel Mix?

Other question related to this topic.<br />You said that you have pisser on your 18 HP.<br /><br />I have a Model# FD-18 Johnson. It is 64 model 18 hp. <br />The interesting thing is that all cooling water on my outboard come from exhaust port. Do I have pisser hole blocked or does it have one?<br /><br />Tumpaa

 

[digimortal777]

Re: Older 18 horse Johnson Fuel Mix?

he probabaly meant the exaughst relief

 

[slow_boat]

Re: Older 18 horse Johnson Fuel Mix?

Lark40<br /><br />What year did the Fastwins/Johnsons convert to roller bearings? The merits/faults of running the older JohnnyRudes on 50:1 TC-3 have been discussed several times on this board with no real concensus reached. <br /><br />I have a first year model Fastwin (15hp-the following years were 18hp) that has very low hours...I run 32:1 Evinrude tc3 in it hoping it is enough oil to lubricate the engine and yet pollute a little bit less than the 24:1.

 

[Kenneth Brown]

Re: Older 18 horse Johnson Fuel Mix?

Tumpaa- Looking from the rear of the motor the pisser is on the right hand side about halfways up. I now feel semi safe that I did no harm running 50:1 but I can't afford to take chances so mine will see at least the 32:1 but more than likely 24:1.

 

[steelespike]

Re: Older 18 horse Johnson Fuel Mix?

Slow boat,I find first year 15 fastwin was 53<br /> last year is 56 the 18 appeared in 57.<br /> I sure would be real careful about reducing my<br />oil mix on a 56 motor.It is definately not<br />all rollerbearing.If polution really bothers you<br />try artificial 2 stroke oil.its darn expensive<br />but is supposed to be biodegradable.

 

[Tumpaa]

Re: Older 18 horse Johnson Fuel Mix?

Kenneth Brown <br /><br />Thanks for the repply. I have to check if I can found a **** hole from it. I thought that it didn't have one as it is so old motor. Maybe it is blocked. Water is spitting from exhaust relief ok anyway.<br /><br />Still got plenty of time to check it out, as we still have 2 ft of snow and 2 ft of ice on the sea.<br /><br />Tumpaa