1966 Johnson oil/gas ratio

[mkmnc]

Does anyone know the oil/gas ratio for a 1966 Johnson 33 hp, model# RXE-14?<br />Thanks,<br />Mike

 

[CATransplant]

Re: 1966 Johnson oil/gas ratio

You can run that one at 50:1.

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

I have been running it at 32 oz per 6 gal which is what it says on the cover, but the cover is off a 1933 model...it smokes and fouls the plugs.

 

[Chris1956]

Re: 1966 Johnson oil/gas ratio

mkmnc, 32 oz/ 6 gal is a 24::1 mix. You can use 16 oz/six gal for your motor.

 

[Paul Moir]

Re: 1966 Johnson oil/gas ratio

Which plugs have you got in it?

 

[CATransplant]

Re: 1966 Johnson oil/gas ratio

I'd use Champion J4C plugs in that outboard, with the oil at 50:1. That will end the smoking and fouling, I'm sure. If you troll a lot with the motor, you might want to gap the plugs at .035 or try using J6C plugs, although I wouldn't use them if you spend much time at WOT.

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

I use J4C...What is the gap for that plug?

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

Sorry, I sent a new post...I did not know that if I replyed that it would bring me back to the top.<br />Motor would only run at low speed..checked plugs and one had no gap. I changed plug and motor run like a scaulded dog. Next day it would only run at low speed...checked plugs and they were fouled but gapped. Put new plugs in and still no speed.<br />Any suggestions?

 

[Paul Moir]

Re: 1966 Johnson oil/gas ratio

Gap is .030"<br />Did both plugs look identical? Was there a heavy carbon build up or did they just look brown? When you go full throttle does it die or does it just go slow? If possible, try pumping the primer bulb when it's acting up. Does it help/harm/do nothing?<br /><br />It could be that you are running rich on the high speed jet. I know some of these 33hp had adjustable high speed mixture controls on their carbs, but others (US?) ones didn't. Do you have an adjustable high speed mixture control?<br /><br />Sorry for the 20 questions!

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

The bottom plug is oily like it is not firing and the primer bulb is firm...I just put a new fuel pump on. I bought new plugs after it run good after changing plug w/o gap. They did not have J4v and told me I may need J6v anyway since my old plugs were fouling and these wer hotter plugs. <br />When you give it full trottle, it picks up maybe a couples mph above idle.<br />There are two carb adjustments, top and bottom with butterfly tabs you can turn in or out.<br />Sorry, I do not have much experience.<br /><br />Mike

 

[Paul Moir]

Re: 1966 Johnson oil/gas ratio

Ok, here's how you set the adjustments on the carb:<br /> http://www.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=030558#000001 <br />You have dual adjustments - which is good because it makes testing much easier. The first step is to remove any of the knobs, levers, etc, from the brass turning part that goes into the carb.<br /><br />So pumping the primer didn't make it run better or worse? If so we can rule out a weak fuel pump, leaking fuel lines, tank, a punctutured fuel pump diaphram, and a leaking inlet needle & seat on the carb.<br /><br />If it's still not working right after you have the carb adjusted, next test is to check spark. You should be able to draw a 1/4" long spark (or better) off each spark plug. I strongly suspect this may be your problem, but I'm worried about the closed gap you encountered. That can be the result of the engine injesting something or serious internal damage. Perhaps (hopefully!) it was caused by a large chunk of carbon breaking off or something though.

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

One last thing before I check the carb adjustments and spark.....Why do you suppose after I changed the plug that had no gap and the motor ran top speed with no missing just purring along and I did nothing but load it on trailer would it be right back to where it was before I changed the plug the very next day?

 

[Paul Moir]

Re: 1966 Johnson oil/gas ratio

Hmm, that's a good point. I've seen brand new spark plugs go bad pretty quick (ie, after a heat up/cool down cycle). If you still have your old ones kicking around, try replacing the bottom plug with one of them. But cracked igntion coils (causing a spark that will only jump less than 1/8") behave the same way, kicking in or out depending on a huge number of factors, including air temperature and humidity.

 

[mkmnc]

Re: 1966 Johnson oil/gas ratio

Thanks, For the help. Will take it back out and try again after checking spark