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Author Topic: CB550K slow jet removal  (Read 1270 times)

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Offline Johnie

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CB550K slow jet removal
« on: August 17, 2011, 12:51:10 PM »
Been helping a friend out with his 78 CB550K. Want to get the slow jets out which are pressed in. Before an attempt to remove them I want to check with you guys on the proper way to remove them without breaking them off. He is having an issue with the slow idle only staying put sometimes. Then it revs and he manually turns the screw to slow it down. Then he throttles it and it stays high, but sometimes comes down. Checked the rubbers and did a sync to see if they were at least close. Tomorrow we check the compression. I am talking him into carb removal to check float level, etc. Otherwise the bike runs great at the cruising speeds.
« Last Edit: August 17, 2011, 01:01:24 PM by Johnie »
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1970 CB750K0 - Candy Ruby Red
1973 CB750K3 - Candy Bacchus Olive or Sunflake Orange
1970 Chevy Chevelle SS396 - Cortez Silver
1976 GL1000 Sulphur Yellow

Oshkosh, WI  USA

Offline Tews19

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Re: CB550K slow jet removal
« Reply #1 on: August 17, 2011, 08:45:45 PM »
SO is the bike idling fine when first starting up? Then the idle hangs once it has been driven for a while? Does it climb and if so where does it level off and hang up at? I have the same bike and it does this... Sometimes though and it runs great otherwise besides the piss poor idling when warm...
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline TwoTired

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Re: CB550K slow jet removal
« Reply #2 on: August 17, 2011, 11:46:02 PM »
The pilot jets in the PD style carbs pull straight out.  Grab and pull.  If you don't have a parallel jaw pliers, then a leather pad & pliers can substitute.

Have you checked the head pipes for even temps?

Also make sure that the floats weren't set to the wrong height.  S/B 12.5 or 14mm NOT 22mm like the earlier carbs require.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline CoachDoc

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Re: CB550K slow jet removal
« Reply #3 on: August 18, 2011, 01:54:52 PM »
What exactly is meant by PD style carbs??? Is that what I have on my "74 550? Getting ready for a carb cleaning and gasket/ O-ring replacement.
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bollingball

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Re: CB550K slow jet removal
« Reply #4 on: August 18, 2011, 02:21:24 PM »
Coach I don't have a 550 but from looking at the part fiche I say yes you have PD carbs. The first giveaway is the keyhole top ;) Also they have a accelerator pump. Below is a break down of your carbs if your bike is stock.

http://www.servicehondapsn.com/fiche_section_detail.asp?section=123061&category=MOTORCYCLES&make=HONDA&year=1974&fveh=2941
« Last Edit: August 18, 2011, 02:23:19 PM by bollingball »
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Offline TwoTired

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Re: CB550K slow jet removal
« Reply #5 on: August 18, 2011, 02:27:16 PM »
For the CB550 only the 77-78 K models had PD carbs.  The PD letters are cast into the carb bodies.  There are no accelerator pumps on the Cb550s.

Earlier carbs have the leaf spring main jet retainers.  The 74 Cb550K0 should have earlier style 022a carbs, which are stamped on each carb body mount flange, top right.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

bollingball

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Re: CB550K slow jet removal
« Reply #6 on: August 18, 2011, 02:43:13 PM »
TT Thanks I learned something I thought from the pic they had a pump.
Do you think I pulled up the wrong pic. Just trying to learn like I said I don't have a 550. So I look at serviceHondas site I don't know what I did wrong But I am sorry to CoachDoc for the error. I don't want to spread misinformation.
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Offline TwoTired

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Re: CB550K slow jet removal
« Reply #7 on: August 18, 2011, 03:30:31 PM »
I know the CB750 and CB650 PD style carbs had accelerator pumps.  I kinda wish the CB550's did.  They'd be a little better to tune for mods if so.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline CoachDoc

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Re: CB550K slow jet removal
« Reply #8 on: August 18, 2011, 04:42:56 PM »
TT, you are right- no accel.pump in these carbs. Is the slow jet unscrewed to remove it on these earlier 550 carbs?
BB, thanks for the effort in looking at the fiche.
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Offline TwoTired

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Re: CB550K slow jet removal
« Reply #9 on: August 18, 2011, 06:41:20 PM »
Pilot jets screw in on early style carbs.  Press in for the PD style.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.
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