OMC fix jet carburetors part 5 of 10 (Motor displayed 1968 Johnson 6hp)
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- čas přidán 21. 02. 2014
- General information, cleaning and carburetor kit application of OMC, Johnson and Evinrude outboards from 1964 to 1970's. Some of this information can apply to OMC, Gale, Johnson and Evinrude motors from mid 1950's to 1960's outboards that have a low speed and high speed needles.
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Great information! Thanks for publishing these videos!
+Islander Sailboat
Your very welcome!!! A good website to go to get additional help for your old motor is
www.aomci.org
The website is free to join and the guys on that forum are dedicated to restoring old motors. A wealth of knowledge and advice can be found there. The Anitque Outboard Motor Club Inc). The ask a member forum is free.
fantastic info thanks'
Hey man
Thanks so much for these videos!
They've been really helpful.
I just acquired a Johnson 6hp that looks like the same year.
Can't get her started yet though...
Finally got spark after setting the plugs and points.
Rebuilt the fuel pump seems to blow the right way.
And now I was able to get the carb out and clean it
without the pull starter assembly falling apart on me.
I thought I got it all right, but... I messed up the low speed packing seals!
Forgot to take them out and melted/mushed them with the carb cleaner.
Can you tell me if there are any suitable replacement washers I can get
reasonably easily without having to get a whole carb kit?
Thanks again man
Can you swap a fixed jet carb bowl and run it on a carb that had a high speed needle in the bowl?
Mark Weaver Morning Mark! That is not a straight forward yes or no type of answer. What make, model, year, hp motor are you inquiring about? It would make giving a response much easier.
@@cajuncookone Here is what I am trying...I have a 1967 18 hp with a carb that has a CRACK where the needle valve seat threads in...so, I am taking the linkage off a good carb from a 1957 18 hp carb putting the linkage on my 1967 on it, AND the bowl of the 57 has the high speed needle in it so using the bowl from the 67. The carb BODY is EXACTLY the same. The 67 has no hole in the lower cowl for the high needle because they are fixed high speed jet after about 1962. I can't see why it will not work?? What do you think, if you can make sence of this ramble!
@@outboardfixer I'm assuming you are trying to put the 1957 Johnson 18hp total carburetor on a 1967 Evinrude 18hp power head.
It looks like it would probably bolt on the the power head and there may be enough clearance for the lower and high speed needle.
The issues would be proper link and sync with the throttle cam and the throttle cam follower. I do not think the air silencer would match up well with the low speed needle length on the 1957 carburetor. The adjustment of the low speed needle and high speed needle would be have to be done with the hood off. You would not be able to swap the low speed needle from the 1967 18hp carb and put it on the 1957 carb. Not compatible.
The 1967 18hp bottom fuel bowl portion with the high speed jet could be swapped and bolted onto the 1957 upper carburetor body and then you would not have to worry about the high speed needle.
NOT sure if all the carburetor linkages and choke lever would cleanly transfer.
Impressions: Probably could be done, but not cleanly.
Suggestions prior to transferring the 1957 18hp carburetor to the 1967 power head:
- Look on Ebay for a good used 1964 to 1969 18hp replacement carburetor.
or
Place a want ad in the classified section on the AOMCI website. There are plenty of Antique Outboard Motor Club members that have tons of parts motors that might give you a really good deal on a replacement carburetor for your motor. I am a member of the AOMCI club. Here is the link.
aomci.org/classifieds/
I will be interested to see how this turns out. You could also post your original inquiry on the AOMCI website in the Ask A Member section. There are alot of experienced guys there that may have knowledge regarding your specific project. Here is the link to Ask A Member section for the AOMCI website. You will have to register for the Classified or Ask A Member sections, but it is free.
aomci.org/resources/ask-a-member/
@@cajuncookone Thats what I was saying, I am using the bowl off the 1967. The carb bodies on the 67 and 57 are identical so linkage swap worked, I am just wondering if a fixed jet bowl will work on a body made for a bowl with a high speed needle in it. If so ALL high speed needles could be replaced with just a plug in the bottom. The carb is on the engine and WORKING in my barrel...just have not had it on the water yet...it starts, idles and revs up PERFECT in neutral. I will let you know after river test.
Mark Weaver Sometimes, it is hard to determine what someone is asking, so I like to clarify. I work in the medical field and details and understanding is important, so I have a habit of clarifying.
Some years back, I was having a discussion with a well respected and well trained outboard mechanic who was working on motors in the 1950’s 60’s 70’s and 80’s. In the 60s there were some kits made to convert high speed needle carburetors to a fixed jet system. Convenience was one advantage. A disadvantage of the fixed jet was that you could not fine tune the running of an engine at different altitudes. At different altitudes an engine with a high speed fix jet could run poorly (either too lean or too rich) based on the altitude the fix jet was meant. So, having an adjustable high speed needle allows you to make more precise adjustments and can be adjusted for different altitudes.
I once did put a fix jet carburetor bowl on a 1957 3hp Evinrude. It ran ok, but it ran smoother with the adjustable high speed needle. It idled smoother as well.
Lower and smoother idle is also dependent on the proper high speed needle adjustment. That is why the high speed needle is adjusted and fine tuned first prior to setting the low speed/idle needle.
Theoretically, you application has merit. Please try it out at the lake and see how well it runs. If it runs to your satisfaction, then awesome!!!!! But not all applications will turnout as well as yours, so saying all high speed needle carburetors should have fix jet carburetor bowls is not practical.
Please, let me know how it turns out :) I am hoping for a good turn out for you!!!!!
Cheers,
Cajun
better yet go to a small engine shop ,,, they USUALLY KNOW what they're selling