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Johnson 6HP 1976 Longschaft Carburator problems

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Michael2010

New member
Hi everyone,
My name is Michael from Holland. I am new here and looking for some help to get my old Johnson outboardmotor up and running. I year ago, I bought an old Johnson 6HP-1976-Longschaft (6RL76) outboard from ebay. The owner/seller told me, that it was in a good condition and was running well. So I bouhgt it for few bucks. After delivery, the engine did NOT work, so I was very disapointed. Also the gearbox was broken badly an I had to weld that. Anyway. Since I am an engineer (Cars mostley) I realy want to try to get this motor fixed. Alltough its very hard to get Johnson outboard spare parts in Holland!

Problem:
Everytime wenn I try to start the engine, it only runs for a vew seconds and only if I turn the Gas-Handle all the way up (Full Trottle). When I turn it back to the "Slow" (Idle) position the engine stops running. I allready tried to change the slow speed needle in all different positions. This did not help at all. BTW. This Motor has just a slow speed needle an a fixed high speed orifice.

So I disasembled and cleanded the carburator and overhaul it with a repairkit inkluding a new floater etc. When re-assembling the carburator, I noticed that there seems to be one part that´s missing, (altough I am not shure about this since it was not there from the beginning!). This "missing" part, which seems to go intoo the FLOAT CHAMBER of the Carburator, is partnumber:0321108 called "ORIFICE PLUG". In the drwaing, it should be right in front of parts number: 28+29(Washer+Screw). So, I am confused and not quite sure, if this orifice should be there or not since it wasn´t there from the beginning when I first disasembled the carburator.

Also maybe missing are the parts 19+26 (leadshot+Srew). In my case there are no holes or anything where these parts could fit in, because the bottom of the float chamber of this particular carburator, ist closed. No holes or open screw-threads or anything of the kind. Its just made this way.
(see drawing at: http://epc.brp.com/Index.aspx?lang=E&s1=07b4cc58-448b-4d63-bd9f-59486abeab39).

Could it be, that these "missing" parts in my carburator, (especialy the orifice), are causing the problems I have getting the engine running?
Or, could it be that this is just an alternative version of the Johnson carburator, maybe desinged for the european market?
(BTW. This outboard was build in Belgium).

Thank you very much for any help you can give me. Its apriciated very much sinds I am realy stuck here

regards and greetings from Holland -:)

Michael
 
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Re: Johnson 6HP-1976-Longschaft Carburator problems

The "orifice plug", 0321108, is the high speed orifice! Are you sure it is not there? It may be a bit further in than you are looking.

Lead shot # 19 I don't know about. This carb is a little bit different to mine.

Screw # 26 ... you are going to kick yourself .... that is one of the 5 screws that fix the bowl onto the carb body!

Surprised you have trouble getting parts. I think there is still a warehouse in Belgium ... Thats where the last part I wanted came from anyway.
 
Re: Johnson 6HP-1976-Longschaft Carburator problems

Hi Vics,

Thanks a lot for the quick reply on my post!
Ups...yheah you are right!.... I have to kick myself... I did not look right at the position of this screw #26 -:)
So thats one mistery solved.

As for the high speed orifice part #0321108, I need to disasamble the carburator again I guess.
I mean, I don´t see any other way of getting to this part, sinds there is just a little space to work in front of the carb.
So I´ll be working on that later and then report back here, if the orifice is there or not. If it is realy missing, than I am in trouble, because this part can not be bought as a spare part anywhere. Would need to buy a whole carb. I guess !!


Thanks again for you help Vics.

Greets from Holland

PS: do you have an adress or weblink from the belgium warhouse?
Thanks
 
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Re: Johnson 6HP-1976-Longschaft Carburator problems

PS: do you have an adress or weblink from the belgium warhouse?
Thanks
Click to expand...
No I ordered a part from a Dealer in the Uk and they told me it had to come from a warehouse in Belgium

That orifice is listed as available so if necessary you should be able to get one even if it takes a little time. Only $7.96 in the USA

I bet you'll find its in there, just further in than you expected.
 
Re: Johnson 6HP-1976-Longschaft Carburator problems

You need a 5 mm diameter screwdriver to get the orifice plug ( main jet ) out of there for cleaning.-----------PS, I used to live near the place where they have that " cheese market " now mainly for tourists.
 
Re: Johnson 6HP-1976-Longschaft Carburator problems

Hi Vics, Hi racerone,

thanks a lot for your input!

Now that I think about it, it could be that I overlooked it when I took the carburator appart the first time and if so, I thus did not clean it.

I´ll be looking in to the carburator later and check if the orifice is realy there.

I´ll get back and let you guys know what I found out.

Thanks again!!


Best Regards

Michael
 
Re: Johnson 6HP-1976-Longschaft Carburator problems

The high speed jet is brass and is located in the cnter bottom portion of the float chamber. It does not come with the kit nor does the lead shot. The lead shot can be made from one of the small ball like fishing line anchors. Clean the high speed jet with solvent and a piece if single strand steel wire.

The removal/installation tool needs to have a diameter that just fits within the 1/4x20 threaded hole and have the tip of the tool machined/filed as you see it here. Ignore the price quote as I'm sold out of them.
317002_CARB-JET_REM-INST.JPG
 
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Re: Johnson 6HP-1976-Longschaft Carburator problems

Hi Joe,
thanks for you reply.
Lead shot:
This might sound like a stupid questton of me but,...What exaclty is the leadshot for and what does it do?
And do I realy need it?
I mean, I can not find a leadshot sitting anywhere in carburator. The bottom of the fuel chamber of my carburator model, ist just worked plain flat. There are no holes, gaps or any other spaces where such a lead shot could fit into. As I said, the bottom (Bowl) is closed.

Taking off the Carburator.
One of the the screws of the carburator is seated directly behind the rewind starter unit and there is little or no space to get a wrench in there loosen that screw.
Is there another and easer way of getting the carburator off from the intake-manifold/powerhead without also having to remove the rewind starter, the spring and the starter rope?

Thanks

Regards
Michael
 
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Re: Johnson 6HP-1976-Longschaft Carburator problems

After holes are drilled in the carburetor body , the lead is used to plug the drill access holes.--------This then leaves a passage way for fuel.-----------A 5 mm diameter shank screwdriver will usually take the jet out.-------The factory tool works just a little better, but not absolutely needed.
 
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Re: Johnson 6HP-1976-Longschaft Carburator problems

As racerone indicates, the lead shot is used simply to plug any small holes in the carburetor that wre drilled for passageway purposes. Unlikely that your carburetor is void of them BUT as long as none are disturbed, they will not require replacing.

You state "One of the the screws of the carburator is seated directly behind the rewind starter etc etc etc". I don't recommend it BUT one can carefully take a thin shafted screwdriver that has a rather sharp tip, and tap it against the retaining nut (I assume you meant nut instead of screw), then spin the nut off. Getting the nut back on can be slightly nerve wracking but it can be done, then tap the nut until it is tight. Personally, I remove the manual starter pulley.
 
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