Topic: 1957 Johnson javilin – Antique Outboard Motor Club,Inc

This topic has 10 replies, 6 voices, and was last updated 9 years, 7 months ago by mhathaway442.

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October 16, 2015 at 7:23 am #2783
mhathaway442
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I just got given a free 1965 silver line 16 with a 57 javlin 35 that has sat for some time. I fired it for the first time today and started quick but rough idle and a pop if you give it a quick jolt of the throttle. I shut her down after 45 seconds as she was smokey. Pulled the plugs looks pig rich but no oil on them. Have not checked timing or points and its getting air in the fuel line. As I’m new to the boat thing any tips of what to go through on her would be great. I ran my mix 32:1 but saw ssomeone recommend 50:1. Also what gear oil should I run. Hoping to have the time to fix her and get her out for a day b4 the season is over. Also the windshield on my boat has bent in due to snow load. I plan on using a memory foam pillow a heat gun and a bord to push it back into shape anyone had to do this. If so how did it go.
October 16, 2015 at 9:48 am #25611
chris-p
Participant
I run 24:1 in my Big Twins.

Hypoid gear oil, with new crush washers in the lower.

Check compression. Should be about 100 to 125 or so and even.

Check spark. Does it jump a 1/4" gap with a bright blue ZAP!!?

These are the starting points.
October 16, 2015 at 10:26 am #25612
wiscoboater
Participant
Replace all the fuel and air lines and make sure the new lines are tightly sealed. Air leaks from old dried up leaking fuel and air lines will have you chasing gremlins and pulling your hair out trying to get it running right. If you have not already, clean out the glass fuel bowl really well and pay attention to that rubber gasket that seals it as well. That’s another spot for a hard to find air leak. Air leaks in the fuel system will give you fits as far as idling and acceleration.
October 16, 2015 at 11:35 am #25613
david-bartlett
Participant
Well you got a great deal at that price!

Good advice from Chris and Wannabe.

+1 on the 24:1. If you run 50:1, you may get away with it for a while, but why tempt fate. Oil is cheap in this hobby.
October 16, 2015 at 4:58 pm #25625
mhathaway442
Participant
Thanx I replaced all the fuel lines think the leak is coming from the coupler. I also noticed my coupler flowers fuel both ways. Should they do that? She has fresh fuel and the system was drained b4 her long sleep. I pulled the carb and bow was clean enough to eat out of. Can’t find my compreshon gadge but will start with the fuel air leak then if problem persists I will check the points and timing. I lucked out on the free thing came with its original trailer with papers. Buddy posted the add I was there with a truck within 2 minutes lol
October 16, 2015 at 9:23 pm #25631
chris-p
Participant
Then the o rings on your connector from your tank are shot. Common for them to dry rot.

Fuel will flow back out from the connector yes.
October 16, 2015 at 11:02 pm #25634
wiscoboater
Participant
If your connector is leaking that will cause another air leak gremlin. They can be rebuilt with a bench vise and a bit of effort. If your not sure how, a member here FrankR sells a nifty tool for rebuilding. If you don’t want to go that route, PM me and if you cover postage I’ll rebuild yours for $2. (the cost of the new Orings).

Wannabe
October 17, 2015 at 1:52 am #25640
mhathaway442
Participant
I can put o rings in it but thanx for the offer my concern was when it is disconnected and I squeeze the primer it still flows fuel is this normal. I’m new to boating but I’m a car guy I can fix dam near anything if I try 🙂
October 17, 2015 at 2:09 am #25642
reivertom
Participant
US Member
If you have a bulb to squeeze, it must have been converted to a fuel pump instead of the original two line pressure tank. Does your tank have a single line running from it? If so, you really don’t know if it was done right or "bubba’d" on a back porch. This changes things a bit until you know the pump is doing what it is supposed to, and the lines are clear. A single line connector should seal up when pulled off the motor and not leak gas even if you pump it. The good news is these are dime a dozen compared to the older two line type and you can get them anyplace. Also if somebody tries to convince you to run anything but 24/1 gas to oil ratio in that motor, don’t listen to them. They are the coolest looking motor OMC ever produced in my opinion, and will last a long time if you feed it what it needs. Don’t worry about smoke….that just tells you there’s plenty of oil getting where it is supposed to….2 strokes all smoke from time to time.
October 17, 2015 at 2:24 am #25643
Mumbles
Participant
No, it’s not normal for the fuel to flow like that. The O rings are damaged or cracked causing the leak or the brass valve inside is jammed or damaged.

If you have a primer bulb in the hose, has someone installed a fuel pump on the motor? Originally the motor would have come with a pressure tank and a dual line hose from the tank to the motor. The pressure tank has a primer button on it to prime the carb. Is your fuel line single or double?

If yours is a dual line, use the proper 301824 OMC/BRP O rings available from your dealer to avoid leaks and ensure proper fit. If the motor is equipped with a pump and single line, it’s easier to replace the connector instead of the O ring inside it.

One of Garry’s cool pics!
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