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Author Topic: 1977 CB550 Sputtering?  (Read 770 times)

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Offline HondaMan

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Re: 1977 CB550 Sputtering?
« Reply #25 on: January 16, 2025, 11:06:35 AM »
Quote from: newday777 on January 15, 2025, 01:53:30 PM
Quote from: MLW9110 on January 15, 2025, 01:45:34 PM
Quote from: RAFster122s on January 14, 2025, 04:51:03 PM
Changing brass from original or carb brand to whatever is in current kits is almost always a mistake. 4 into 1 is known to sell cheap Chinese junk and their service after the sale for any legitimate issues is non-existent. Avoid them

I may put the brass that was in the carbs back in but I suspect they aren't the original parts.
There should be a stylized K on the Keihin brass

Nice camera! :)
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Offline newday777

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Re: 1977 CB550 Sputtering?
« Reply #26 on: January 16, 2025, 11:18:47 AM »
Quote from: HondaMan on January 16, 2025, 11:06:35 AM
Quote from: newday777 on January 15, 2025, 01:53:30 PM
Quote from: MLW9110 on January 15, 2025, 01:45:34 PM
Quote from: RAFster122s on January 14, 2025, 04:51:03 PM
Changing brass from original or carb brand to whatever is in current kits is almost always a mistake. 4 into 1 is known to sell cheap Chinese junk and their service after the sale for any legitimate issues is non-existent. Avoid them

I may put the brass that was in the carbs back in but I suspect they aren't the original parts.
There should be a stylized K on the Keihin brass

Nice camera! :)
On my phone
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline jlh3rd

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Re: 1977 CB550 Sputtering?
« Reply #27 on: January 27, 2025, 05:28:50 AM »
Quote from: jonda500 on January 15, 2025, 03:19:54 PM
Maybe I'm wrong, but I thought the US model '77 550F (and all 550F models) came with 069A carbs with #98 main jets?? Original post says it is a 550F!
John

069A's  are correct for U.S. '77 models.
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Offline Oddjob

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Re: 1977 CB550 Sputtering?
« Reply #28 on: January 27, 2025, 10:09:02 AM »
Still too busy doing building work to check but haven't forgotten to see if I can help.
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Offline Oddjob

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Re: 1977 CB550 Sputtering?
« Reply #29 on: January 30, 2025, 04:15:58 PM »
Just found my stash of carb parts, I have some others somewhere but the building work has trashed the house and they could be anywhere.

I have 3x550 emulsion tubes, they have graduated holes, larger to smaller as they go down, they also have an extra hole in the side that the 500 carbs don't get. I may find another but maybe I won't, it depends on how lucky I am.
I have 4 mixture screws, solid, no drillings at all.

I have removed the needles from 2 of the carbs and they are stamped 273004, I presume the other 2 will be the same.

I also have 38 pilot jets and 98 main jets.

What exactly do you need? All are genuine with Keihin markings.
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Offline Oddjob

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Re: 1977 CB550 Sputtering?
« Reply #30 on: January 30, 2025, 04:43:41 PM »
As suspected, 4 needles all bearing 273004, 5 grooves BTW. Still no sign of another 550 emulsion tube though.
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Offline dave500

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Re: 1977 CB550 Sputtering?
« Reply #31 on: January 31, 2025, 02:53:01 AM »
those graduated hole emulsion tubes are the ones to use,also,just chamfer the openings a touch with a twist drill with thumb and index finger.
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