Cleaning Slow Jets


Information and questions on GL1200 Goldwings (1984-1987)
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phoenixtubs
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Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate

Cleaning Slow Jets

Postby phoenixtubs » Wed Jun 03, 2015 2:14 pm



HI, I'm new to the forum, and I am in the midst of cleaning up the carbs on a 1985 Interstate. I think I made a newbie mistake in that I PM'd someone to ask a question instead of posting it on the forum so everyone can benefit. This is an effort to correct my mistake.

I found all the info I needed here: viewtopic.php?t=10147#p48315, and I am very grateful to everyone who took the time to post all of that information.

One thing that was not clear to me was how to clean the slow jets. I wasn't sure if I was supposed to be able to pass a wire through the jet from top to bottom as with the main jet and holder, or if the jet was a tube with two chambers. It turns out you can pass a wire completely through the jet, but it is a very small diameter hole, similar to the diameter of the orifices in the jet. I used a piece of an 'e' guitar string to clean them up.

Thanks, and thanks to the person who was kind enough to PM me back with this info.

Ed



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virgilmobile
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Re: Cleaning Slow Jets

Postby virgilmobile » Wed Jun 03, 2015 2:46 pm

Anytime.Check the float height too.Tilt he carb assembly till the float just rests against the needle valve.Not compressing the spring loaded plunger.Measure both sides,it must not be twisted.Clean the pivot too.Buildup can make a float stick there just as easy as the needle valve can jam in the valve seat guide.I usually polish all those parts.

phoenixtubs
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Re: Cleaning Slow Jets

Postby phoenixtubs » Wed Jun 03, 2015 3:13 pm

Thanks. I had to order a new set of needle valves because two of them had frozen plungers. I'm waiting on those parts now.

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virgilmobile
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Re: Cleaning Slow Jets

Postby virgilmobile » Wed Jun 03, 2015 3:20 pm

Great.Keep us updated or if you have questions.Its easier to answer a question than fix a broken part.
There's not much difficulty servicing carbs,just tedious work.Take your time and get each one right.A poorly assembled carb,plugged or sticking obviously will never preform on the bike.Do test and adjust on the bench before you put it back on.Then there's just the sync left.

phoenixtubs
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Location: Chicago, IL
Motorcycle: 1985 Interstate

Re: Cleaning Slow Jets

Postby phoenixtubs » Wed Jun 03, 2015 3:30 pm

Will do. The valves are shipping tomorrow.

phoenixtubs
Posts: 8
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate

Re: Cleaning Slow Jets

Postby phoenixtubs » Wed Jun 10, 2015 4:56 pm

virgilmobile wrote:Great.Keep us updated or if you have questions.Its easier to answer a question than fix a broken part.
There's not much difficulty servicing carbs,just tedious work.Take your time and get each one right.A poorly assembled carb,plugged or sticking obviously will never preform on the bike.Do test and adjust on the bench before you put it back on.Then there's just the sync left.



Well I've got everything back together and I do have a question. For a bench test, are you saying I should hook up a shop vac to the air feed pipes that go into the cylinder head?

Thanks

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virgilmobile
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Re: Cleaning Slow Jets

Postby virgilmobile » Wed Jun 10, 2015 6:01 pm

Yes. One at a time.I used a small vac and when the throttle was operated from closed to full open each slide would rise almost half way up.Doing this,I found one sticking up.A few adjustments to fix it.
I also preset each idle jet by the book.
And...Preset each throttle plate so they start to open at exactly the same time.
This is a pre-sync.It makes the final "on engine"sync much easier.

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wingman12
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Re: Cleaning Slow Jets

Postby wingman12 » Wed Jun 10, 2015 6:47 pm

I had to completely rebuild the carbs on a 1982 interstate and I found it to be very beneficial to use alum foil to polish all jets, needles, inside the chamber where the slide goes, the slide works so much better with a polished surface. It does not take much to make everything smooth and shiny, just patience and time.

phoenixtubs
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Re: Cleaning Slow Jets

Postby phoenixtubs » Fri Jun 12, 2015 3:46 pm

I polished everything up, all the passages and jets are clear, and the slides seem to be moving freely. However, when I do the vacuum test, the slides don't move. At rest they're sitting something like a 1/4 inch below the open throttle plate. I'm using a shop vac, and just cupping my hand as a makeshift adapter between the vacuum and intake hoses. Do you think I need to get more suction, or is there something amiss with the slides?

Thanks,
Ed

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wingman12
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Re: Cleaning Slow Jets

Postby wingman12 » Fri Jun 12, 2015 4:51 pm

good afternoon Phoenix. I did not know that I should have tested the slides this way before reinstalling the carbs. I just made sure everything moved easy (by hand) no binding or uneven movement. I guess blind luck, but I did not have any issues with the slides. reinstalled carbs, small air/fuel mixture adjustments the synked the carbs. I think Virgil will have to answer you vacuum test issue. Being a back yard mechanic, this is why I often have to do things several times before I get it correct. Practice makes perfect?? Sometimes anyway. :) :)

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virgilmobile
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Re: Cleaning Slow Jets

Postby virgilmobile » Fri Jun 12, 2015 6:40 pm

I have just a small shop vacuum.Just holding it tight to the carb connection,I open the throttle wide open and each slide rises almost half way up.
If your connection is leaking real bad,not enough air flow will stop the slides from moving.
Also,did the slides get back in the right way?remember the rubber orientation nibble.

phoenixtubs
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Location: Chicago, IL
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Re: Cleaning Slow Jets

Postby phoenixtubs » Fri Jun 12, 2015 7:02 pm

Thanks guys. I did orient the slides the right way. I'll try to get more vacuum and see if that makes a difference. I know I can open the throttle and move them up by hand rather easily and I can see them fall back into place on their own so I don't think they're stuck.

phoenixtubs
Posts: 8
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate

Re: Cleaning Slow Jets

Postby phoenixtubs » Mon Jun 15, 2015 10:51 am

Well, good news! Put the carbs back in this weekend and she started right up. Thanks to this forum and Virgil and Wingman for their advice.
Ed

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wingman12
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Re: Cleaning Slow Jets

Postby wingman12 » Mon Jun 15, 2015 11:07 am

happy riding if mother nature will ease up on the rain. personal opinion even though you did a though cleaning of the carbs. run a few tanks of seafoam treated 87 Oct fuel to clean any areas you might have missed.




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