Topic: Pressed-in Jet Removal

[Frankenkit]

I've poked around the search engine and FAQ, but couldn't find an answer to my question...

It's become pretty obvious my slow jets are clogged.... (Thanks, TT) the 650s are 'pressed in' and according to Clymer, non-removable.  What I found on here said to get a good grip, twist and pull.  I tried this and stopped when I saw I was marring the external bit of brass on my jet.  Not good.  =P  Didn't screw up the internals or the little hole in the jet... just grabbing the base near the floats...  So how would I go about removing these buggers (if possible).... if not... how would I go about cleaning them- just carb cleaner and compressed air?  Also.... how would I go about getting yamaha carb cleaner?  Is it only avaliable online, or would NAPA or Schucks have it?

Arigato!

[SteveD CB500F]

If they are that gummed up you will need more than compressed air.  Try some lengths of copper wire (or I have heard of people using guitar strings...)

Yamy carb cleaner should be available from your local Yamaha dealer - mine however, shrugged and said "Nah mate, we don't stock that, we use Wurth products"

I looked at Wurth website but was very confused as to which one would be OK for bike carbs.  So emailed their tech help address.  No response (surprise)

Why do people put up info@ type addresses and then ignore them?

[crazypj]

dont  try any further to take them out, even if you do you probably wont get them in again without major damage. If local Yam dealer doesnt have it in stock , best thing to do is go to another yam dealer and order it (It is as good as everyone says, bit pricy though) Copper wire is softer than brass jet so it doesnt open up the holes( although CB650 runs a bit on the lean side so slight 'adjustment' wouldnt be much of a problem) Wurth doesnt supply to general public, you would have to open an account and then maintain minimum orders and stuff.
PJ

[my78k]

The idle jets on my 78k are pressed in as well...I have had success in removing them a couple of times. I took a set of vise grips (do not over tighten) but put a piece of cloth i.e. rag over the jet first to keep from marring them...twist slightly and pull...

My jets were so blocked that I HAD to get them out in order to clean them properly....soaked in carb cleaner overnight and then used compressed air then used the samll bit of wire trick and pressed em back in...

Done this twice now (didn't put an inline fuel filter in place the first time  ) and have had no problems with them...

Just my thoughts tho...

Dennis

[TwoTired]

dont  try any further to take them out, even if you do you probably wont get them in again without major damage.

I've not seen the inside of cb650 carbs.  Keihin PD's perhaps?
Could you share why the pressed in jets such as are in the CB550 and CB750 for the 77-78 model years can be removed and reinstalled, but the ones in the 650 can't be done the same way?  What is different about the arrangement?  Are we talking mechanical slide carbs or the CV ones?   

Thanks,

[Frankenkit]

I believe they're mechanical slide, but I've been ...uh... wrong before.  These can't easily be removed.  I'm wondering how I'd clean them with the copper wire... I can see a 2-ish mm hole through the bottom of the carb (the base being brass...) but is it hollow all the way through?  looking through the carb's center, from the side, I see a little pin, presumably from where I unscrewed the main jet (didn't have o-rings or washers on any of those... maybe the PO lost them and just didn't put 'em back on?)   

They're the type of carb with the longish rectangular top, if that helps...  I thought CV had a different shapped top.  It's 1980, too... supposedly the last year mechanical slides were used in 650s.  how much does that yamaha carb cleaner cost?

[dusterdude]

1980 was supposed to be the last year for mechanical carbs,my 81 has cv`s.

[byidesign]

You have to be careful, as the hole is @.013--.017 thousandths {depending on jet#}
   and the small dia. is located up inside the jet.
       they will pull out {carefully with pliers} keep them numbered to replace in the same carb..
      Under total loss conditions style #22 slo jets {threaded mid section} can be
         refitted to work{did it for my friends 78 cb750}.stock is#35,used one over size#38's
            as he had modified pipes and needed a little richer mix.
      I   built up the middle area{thread area} with solder, and turned it down in a lathe,
          just past the nose length of the old ones....
         turned the size, to a light press fit, and pushed them in. {carefully as the mix nozzle
         bottoms into carb body}  bike runs quite well, and
            the lead solder section being softer, will not damage the carb body.
                Hope it helps
                        Bruce

[Frankenkit]

yeah... mine are stuck tight though... is there any hope of cleaning them without removing them?  I don't want to risk breaking them by reefing to remove 'em...

[crazypj]

I believe Honda was trying to placate the DOT with 'new ' EPA regulations
PJ

[TwoTired]

yeah... mine are stuck tight though... is there any hope of cleaning them without removing them?  I don't want to risk breaking them by reefing to remove 'em...

If the slow jet is styled like the ones in the Cb550 carbs 77-78, then with effort you can get the jet orifice clear.  However, there is a small emulsion tube hidden inside that has cross drilled holes.  These can't be mechanically cleaned without removal.  It's only guesswork to chemically clean these.  If the deposits are soft, maybe a chemical clean will be enough.  If the deposits are hardened and flaky, either yank the jets or roll the dice and pray you soaked and cleaned them well enough.

Have you tried parrallel pliers with soft jaws?

cheers,

[HondaMan]

Best cleaner I've seen: strip off the insulation from some stranded 16 gauge wire (copper) and use a strand to push inside, then wiggle around, spray before, during and after with Gumout Carb Cleaner spray. The copper is softer than the brass in the jets, so it will not damage the holes. With a bit of patience, you can curve the tip of the wire, then spin it 'round up inside to loosen the emulsifier holes of their gunk, then rinse with the spray. It takes a while, but works pretty well.

Afterward, try running an ounce or two of Marvel Mystery oil in the gas for a tank, then spray those jets again after a tank of fuel goes by. The oil loosens up the stubborn stuff and lets you finish the job easier.

[byidesign]

If you get it back together after trying to clean it with still no{good} result,
   let me know, after making one set{jets}, it wouldn't take long to do it twice,
      {that's what having a Tool+Die machine shop in the basement is for...}
          I live in Ct.
              Hope it helps
                      Bruce

[Frankenkit]

Have you tried parrallel pliers with soft jaws?

no, I haven't... I've had the project on hold while waiting for some answers and poking and piddling with it on and off... Parallel pliers with soft jaws- would ordinary vicegrips with a cloth to reduce marring work in lieu of this?  I don't think I've ever seen said tool, but I'll google it for a pic.  Thanks!