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Author Topic: CB550 -76 won't stay running  (Read 5134 times)

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Offline Bankerdanny

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Re: CB550 -76 won't stay running
« Reply #50 on: April 19, 2019, 01:55:26 PM »
Well, the good news is that there is someone on eBay that sells them.

The bad news is that they are $25 each (free shipping!)

https://www.ebay.com/itm/HONDA-CARBURETOR-CARB-CARBY-MAIN-JET-SPRING-CLIP-HOLDER-RETAINER-0218-401/183453888274?epid=23010175526&hash=item2ab6b42f12:g:8L8AAOSwlptZ6Qtg
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Offline TwoTired

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Re: CB550 -76 won't stay running
« Reply #51 on: April 19, 2019, 02:26:19 PM »
The original springs were not stainless. FYI

There were some posts a while back where an Eclip on the jet, and a coil spring from the hardware store, supplied the same function of holding the jet in place.

The bowl pushes on the spring like the original, and that holds the jet in place, with the bowl screwed tight.

Hardware store parts are cheaper than $25/spring.

Sorry, I have no spares.  In fact, I have deficit for the carbs I have.

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 Scott S

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Re: CB550 -76 won't stay running
« Reply #52 on: April 20, 2019, 04:57:02 AM »
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Offline Bankerdanny

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Re: CB550 -76 won't stay running
« Reply #53 on: April 20, 2019, 08:40:44 AM »
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

Online bryanj

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Re: CB550 -76 won't stay running
« Reply #54 on: April 20, 2019, 08:44:44 AM »
Sirius in Canada do them but were out of stock a couple of weeks ago
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline addictedtocafe

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Re: CB550 -76 won't stay running
« Reply #55 on: April 20, 2019, 09:42:47 AM »
What are your mixture screws set at now? You said 40 slow and 118 mains? Could be a little bit too rich. If you engage the choke does it get better or worse? If it gets worse you are too rich and may need to drop some jet sizes, or lean the mixture screws slightly. If it's really boggy off-idle or when you're pulling away, well.. it sounds like it could be too rich to me.

Nice looking bike :)
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Offline Torkel

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Re: CB550 -76 won't stay running
« Reply #56 on: April 26, 2019, 08:46:03 PM »
I’ve been on a short vacation, so the bike has been waiting. Anyway, I also found the only jet springs on eBay but thought $25 a pop was a bit much. So I dug out a box on mixed springs and snapped a suitable one onto my jets instead. They put a reasonable spring pressure on the jets when the bowls are attached. Fun to see that this was already tried! My springs where just the right size though, so no E-clips needed.

As you may recall, the issue I was chasing was that header tube #1&#2 didn’t get anywhere near as hot as 3&4, indicating that those cylinders at least wasn’t firing as often. Taking apart the carbs showed that all jets were still in place. So that’s not the reason.

I also moved E-clips on the needles up to second highest slot, leaning out the mix a bit while I had the carbs on the bench.

Next step is to reassemble and continue to try and find root cause. I’ll go thru the wires and coils again, making sure I have strong spark on all 4 plugs.

Tach is fixed with parts from a bent up one from eBay. Win!
« Last Edit: April 26, 2019, 08:54:49 PM by Torkel »
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Offline Torkel

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Re: CB550 -76 won't stay running
« Reply #57 on: April 28, 2019, 04:52:23 PM »
She rips! Suck me sideways, this thing is a blast!

You guys are never going to believe this. I was just about to install the carbs back on the bike when I paused and thought: "If the previous owner ran the bike without slow jets or jet springs, there is a pretty good chance he/she/they (it?) missed something else". So I checked some exploded view pics of the carbs online and found a cool little clip I recognized. I have no idea what it is called, but the little jets/nozzles that has the plunger to shut off fuel flow to the carbs are held down with a little clip. My carbs didn't have those, but I still had them saved from when I tore the bike apart. Why? Because they where used, together with a zip tie, to hold the cable running along the clutch cover. Yup... I thought they looked out of place, but I sure didn't guess they actually belonged in the fuel bowls.

Armed with this new knowledge of record breaking hackery, I removed the fuel bowls again. And, of course, on carb 1&2, the nozzle and the plunger under the fuel float had started to back out. With all the clips in place and the needles adjusted, she fired right up and idled fine!

Took her for a drive and Yes! There we are! She is running a bit rich (textbook rich behavior) but that is just some jet sizing and fiddling.

WIN! Thanks for the help, gents!
« Last Edit: April 29, 2019, 05:14:36 AM by Torkel »
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Online bryanj

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Re: CB550 -76 won't stay running
« Reply #58 on: April 29, 2019, 05:10:16 AM »
I sorry i dont get it $25 for 4 clips THE COST IS FOR A SET NOT EACH is peanuts compared to the original Honda cost and the people have gone to the expense of making tooling to manufacture them.

For christ sake use the correct parts so its reliable!!!
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Torkel

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Re: CB550 -76 won't stay running
« Reply #59 on: April 29, 2019, 05:23:24 AM »
Quote from: bryanj on April 29, 2019, 05:10:16 AM
I sorry i dont get it $25 for 4 clips THE COST IS FOR A SET NOT EACH is peanuts compared to the original Honda cost and the people have gone to the expense of making tooling to manufacture them.

For christ sake use the correct parts so its reliable!!!
You DO realize 4into1 have been out of stock on this part for some time? And that the $25/clip refers to the part sold on eBay?
« Last Edit: April 29, 2019, 05:29:59 AM by Torkel »
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Online bryanj

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Re: CB550 -76 won't stay running
« Reply #60 on: April 29, 2019, 05:44:05 AM »
Dont deal with 4 into 1 as i am in uk and the ebay l looked at said $25 per set

EDIT
look up seller gerben 1956 who is in Netherlands and does sets plus o rimg sets
« Last Edit: April 29, 2019, 05:52:29 AM by bryanj »
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!
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