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Offline redrider736

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knee deep in my 1st carb rebuild (78 cb550 pics)
« on: July 11, 2014, 12:52:31 PM »
OK. On summer holidays, wife away, 2 brown pops in and.......



Something LQQks different????





This is my 1st CB,  and my 1st time ever tearing into a bike......  I read up and watched a few great vids about cleaning/rebuilding your carbs........  What you are looking at are 78 CB 550k carbs....

Question......  Why is carb #3 different from the others?

« Last Edit: July 11, 2014, 01:15:47 PM by redrider736 »
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Offline flybox1

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #1 on: July 11, 2014, 12:55:11 PM »
be careful not to mix up the parts.  if it came out of a carb, put it back in that same one.

its different because its the slave carb, meaning, all other carbs in the rack are tuned to match that one, and it should be #2, looking left to right, while sitting on the bike
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline Jimsun

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #2 on: July 11, 2014, 12:57:44 PM »
The #3 you said is actually carb #2 and that is the preset which the other 3 needs to follow when you synch the carbs
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Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #3 on: July 11, 2014, 01:10:16 PM »
My bad on the numbering ( learning a bunch today :) I have individual containers for all 4 carbs....

2nd question; how do I remove the "slow  jet" ? Its round in shape and didn't want to force  anything out without really knowing how too.......  Do I need to "bang" it out?
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Offline MiGhost

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #4 on: July 11, 2014, 04:09:22 PM »
Quote from: redrider736 on July 11, 2014, 01:10:16 PM
2nd question; how do I remove the "slow  jet" ? Its round in shape and didn't want to force  anything out without really knowing how too.......  Do I need to "bang" it out?

The slow jet is pressed in. You can use pliers to twist, and pull it out. Use a shop rag, or similar between the jet, and pliers to keep from marring the soft brass.

DO NOT pound directly on the jet when reinstalling. It WILL damage the jet. Use a soft piece of wood to buffer to blows.
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Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #5 on: July 11, 2014, 06:12:09 PM »
Thanks all,  info help out greatly.....  I bought a Keyster deluxe rebuild kit from 4into1....... Then read a post saying that I should sick with OEM and that the Keystars are junk.....  Any thoughts?
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Offline flybox1

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #6 on: July 11, 2014, 06:32:49 PM »
Learned that lesson back when I had my 350F  :-\
I'll never buy anything but OEM.....
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #7 on: July 11, 2014, 06:48:18 PM »
S*#t ! Expensive lesson learned....  We're is the best place to order OEM? 

Quickly found

http://www.cmsnl.com/honda-cb550k-1978-usa_model7222/partslist/


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Offline flybox1

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #8 on: July 11, 2014, 08:26:37 PM »
I prefer jetsrus.com
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline Deltarider

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #9 on: July 12, 2014, 02:20:43 AM »
Why in the world did you remove these parts (in the photo)? They never ever need servicing.
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Offline seanbarney41

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #10 on: July 12, 2014, 02:34:01 AM »
Quote from: redrider736 on July 11, 2014, 06:12:09 PM
Thanks all,  info help out greatly.....  I bought a Keyster deluxe rebuild kit from 4into1....... Then read a post saying that I should sick with OEM and that the Keystars are junk.....  Any thoughts?
gaskets and o-rings will probably work...don't use the brass.   Plenty of Honda dealerships online for oem stuff.
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Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #11 on: July 12, 2014, 07:42:08 AM »
Quote from: Deltarider on July 12, 2014, 02:20:43 AM
Why in the world did you remove these parts (in the photo)? They never ever need servicing.

I can't leave anything alone,  wanted to learn how to tear them down and too see what condition they were in
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Offline billingstitan

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #12 on: July 12, 2014, 08:58:19 AM »
It's a worthwhile endeavor to tear those carbs apart - you learn a lot and become comfortable enough that the intimidation factor goes away.

Carbs are the key  ;D

Just be gentle - that old metal cracks easily. An air compressor is invaluable during the cleaning process. So are replacement screws for the float bowls and top caps. I have a bag of spares I keep on hand.



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1977 CB550K
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Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #13 on: July 12, 2014, 12:01:51 PM »
Got her out! I was just being too "gentle" with them...  Worried I was doing something wrong..







I cut a small piece of leather off an old baseball glove as to not damage the jet
« Last Edit: July 12, 2014, 12:16:27 PM by redrider736 »
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Offline redrider736

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #14 on: July 12, 2014, 12:21:52 PM »
Is there anything else that needs to come out before cleaning / dipping the metal parts ??

How do I remove these ???


Also....When I removed all the parts I took a inventory of the parts pre/Carb and noticed that I was short 1 shim/washer & o-ring in #4 Carb, and 1 shim/washer in #2 Carb in the Idle mix screw ????
« Last Edit: July 12, 2014, 12:24:43 PM by redrider736 »
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Offline MiGhost

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Re: knee deep in my 1st carb rebuild (78 cb550 pics)
« Reply #15 on: July 12, 2014, 06:00:10 PM »
If you are refering to the idle mixture screw washer, and o-ring. They are likely still stuck up in the carb body. You can use a small pic to dig them out.

When reinstalling the correct order is spring, washer, o-ring .
The washer protects the o-ring from being cut by the spring.

The original brass pieces are likely to be in good condition still.
The gaskets, and o-rings in those keyster kits will be fine.
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