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Author Topic: CB550 High Idle  (Read 8562 times)

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Offline Ian_Butler

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Re: CB550 High Idle
« Reply #25 on: June 06, 2013, 01:31:38 PM »
Changing the needle clip position led me to a new discovery. The slide guide pin on the #4 carb was tight against the walls of the slide guide. It was so tight that the slide did not move freely. This was the first carb I rebuilt (I did one one night and 3 the next day) I guess I didn't think much of it at the time. I crimped the guide with some pliers and now the slide moves free and smooth like the rest of them. I'm still going to wait until that vac sync kit gets here before I fiddle anymore, but I think that might explain why #4 was rich and why the idle would hold around 3k... Tomorrow's work should make things a little clearer. I'm still trying to get that video from my sister (some of y'all might understand my woes here lol). I'll post it ASAP.

Thanks guys!
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~ Ian

1974 CB550K

“In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV. You're a passive observer and it is all moving by you boringly in a frame. On a cycle the frame is gone. You're completely in contact with it all. You're in the scene, not just watching it anymore, and the sense of presence is overwhelming.” ― Robert M. Pirsig

Offline mono

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  • 1975 Honda CB550, 1978 CB750K (in progress)
Re: CB550 High Idle
« Reply #26 on: June 06, 2013, 01:59:36 PM »
Quote from: TwoTired on June 06, 2013, 09:03:18 AM
Quote from: Ian_Butler on June 06, 2013, 08:55:49 AM
I kicked up the bike up this morning after leaving the battery charging last night. Perfect one kick cold start. I'm beginning to wonder if I have a charging problem...

Charging system methodical verification checks, CB750, CB550, CB500, CB400, and CB350.
* truncated*

TT, all i have to do is follow you around for all my answers,  been searching for a good procedure for a week!   
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Offline Tews19

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Re: CB550 High Idle
« Reply #27 on: June 06, 2013, 08:26:03 PM »
Glad you found the error. I wanted to share that i finished my carb clean and rebuild on my 550F and installed today. I made sure they were spotless and the tank was as well. The tank has some very minimal rust specs so it is soaking in vinegar right now. But the spare tank i used was clean. First start up and she idles great. No hanging or anything. I would suspect with that in mind you have some dirt in the carbs and maybe the clip position is not correct or something is to tightly put back together. 
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Ian_Butler

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Re: CB550 High Idle
« Reply #28 on: June 06, 2013, 08:58:35 PM »
yep, a few throttle snaps proved that she was actually doing quite good. It did not hang this time at all! Best news is that my vac sync kit gets in tomorrow so I should have a good running bike very soon! Next step is to go through the charging system bit by bit following that guide that TT gave me (great information BTW). On a side note, I now have the necessary tools to actually perform those tests. This morning my dad decided he'd help me track that down and ended up setting an ammeter on fire when he forgot to switch the circuits on the multimeter  ::) That encouraged me to fix his old Fluke 87 (a far superior tool that was "broken" a number of years ago).

Anyway, I'll vac sync the carbs, and if I don't post back in this thread (other than the long promised video), then everything is great in 550land. Otherwise, I'll let you know what's happening.

Thanks so much for your help thus far! I would have never found that were it not for you guys!
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~ Ian

1974 CB550K

“In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV. You're a passive observer and it is all moving by you boringly in a frame. On a cycle the frame is gone. You're completely in contact with it all. You're in the scene, not just watching it anymore, and the sense of presence is overwhelming.” ― Robert M. Pirsig

Offline Ian_Butler

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Re: CB550 High Idle
« Reply #29 on: June 10, 2013, 02:13:17 PM »
Since I had the tank off and needed longer lines for the vac-sync anyway, I decided to replace the fuel lines. That was a great idea. The current set up turned out to be a hack job on some pvc line bought from NAPA. Not too good for the carbs given the inside was prone to flaking little bits of rubber... I got some real fuel line from a local cycle shop and *poof* no more leaks.

Vacuum sync went really well. It was close but not nearly good enough. After I got a long enough line, it only took me a few minutes with a screwdriver and a 8mm spanner to get the job done. As of right now the bike will back down to idle smoothly every time and it doesn't get stuck at that 3k mark. Unfortunately, this is just sitting in neutral. I didn't feel like going swimming today; it's raining tons here in upstate NY.
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~ Ian

1974 CB550K

“In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV. You're a passive observer and it is all moving by you boringly in a frame. On a cycle the frame is gone. You're completely in contact with it all. You're in the scene, not just watching it anymore, and the sense of presence is overwhelming.” ― Robert M. Pirsig

Offline Tews19

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Re: CB550 High Idle
« Reply #30 on: June 10, 2013, 02:17:53 PM »
Progress! Very exciting isn't it!
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Ian_Butler

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Re: CB550 High Idle
« Reply #31 on: June 10, 2013, 02:41:37 PM »
I truly enjoy working on this bike. I thought at first it would feel like taking another class, but after the time I've put into this bike, I can say that there's something really nice about turning a wrench and taking a machine and making it well tuned. It doesn't hurt that the purr and roar of the engine really is a great sound.
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~ Ian

1974 CB550K

“In a car you're always in a compartment, and because you're used to it you don't realize that through that car window everything you see is just more TV. You're a passive observer and it is all moving by you boringly in a frame. On a cycle the frame is gone. You're completely in contact with it all. You're in the scene, not just watching it anymore, and the sense of presence is overwhelming.” ― Robert M. Pirsig

Offline BudgetBiker

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Re: CB550 High Idle
« Reply #32 on: December 22, 2019, 10:27:17 AM »
This looks a bit old since its 2013 but seems like the same issue my 1975 CB550F is having but after i replaced the engine head gasket. I found the 4 cylinders were caked eith carbon build up so cleaned it all up. Now i have a idle issue. Anyone from this thread still check in? Might have a few questions. If not, may start another thread. Was wondering if the original poster was able to get the idle to stay at 1000rpm and not have to adjust it all the time.
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