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Author Topic: CB550 Refurb  (Read 6958 times)

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Offline 540nova

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Re: CB550 Refurb
« Reply #25 on: November 01, 2016, 09:35:24 AM »
At mid to high RPM, the weights should be out, not in. From idle to about 3000 RPM, they should be at rest, and fully extended beyond that.


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Offline Antiquar

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Re: CB550 Refurb
« Reply #26 on: November 01, 2016, 06:03:08 PM »
Thanks guys. I have looked at them with a timing strobe, and they definitely are fully open around 2500. I take it that is too early then?
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Offline RAFster122s

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Re: CB550 Refurb
« Reply #27 on: November 01, 2016, 07:12:19 PM »
Might need to pull the advancer to ensure it is clean with no corrosion.  Lube it wih a bit of synthetic oil (more stable and consistent across the temperature range. Just watch its orientation during disassembly.
When cold the added resistance of a thick lube could slow the advance while when warmed it does not.  That's my thoughts about it...


Have you changed the orings for the intakes?

Definitely shorten the springs as suggested. 
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David- back in the desert SW!

Offline Antiquar

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Re: CB550 Refurb
« Reply #28 on: November 01, 2016, 08:20:59 PM »
Yeah, I renewed the intake o-rings. The old ones were incredibly dry and probably not sealing too well.

I cleaned and lubed the advance last time I did points, and it seemed to operate nice and smoothly. Of course, I don't know by hand what kind of tension the springs should have. I'll have to give shortening the springs a try. Just did a search and found a plethora of information on this subject. Seems like a common problem on these bikes.  :)
« Last Edit: November 01, 2016, 08:26:27 PM by Antiquar »
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Offline Antiquar

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Re: CB550 Refurb
« Reply #29 on: November 09, 2016, 03:42:50 PM »
Okay. I did a lot today. Reset valves. Cleaned spark plugs (sooty from my previous attempts at tuning). Cleaned spark advance unit. Installed Pamco ignition (timing is spot on now, checked with a timing strobe). Resynced carbs. She is running much better now.

There is a slight hesitation (likes to hang ~2000 for just a moment, < 1s) when the revs are dropping back to idle, but nothing at all like before. I think this hesitation might be a weak advance spring.

Will check plugs and do another tune up in a few miles. But for next I will be on to brakes and tires--you know, those pesky safety bits.  :)
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Offline surfrider74

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Re: CB550 Refurb
« Reply #30 on: November 19, 2016, 12:30:25 PM »
Nice bike great thread-not long after you bought yours i bought mine-74 550FourKO-Boss Maroon/Black-jealous of your color scheme wish they offered for this model.
CA ethanol has my carbs all gunked up-just cleaned though-no rebuild needed.
Small leak at shift shaft seal-replaced fork seals and cleaned up forks-new oil etc...
Now chasing possible clutch case gasket leak/clutch seal? leak.

Fun to wrench on these things!
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1974 CB 550Four

Offline Antiquar

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Re: CB550 Refurb
« Reply #31 on: November 28, 2016, 04:07:09 PM »
Hey, surfrider, thanks for your kind words. I saw your thread earlier. Yeah the ethanol really does a number on these old carbs. One of my slides was corroded stuck, so I had no real choice but to open 'em up. And yeah, I agree, these bikes are nice to work on.

As far as updates are concerned, the bike has new rubber, new brakes, and a rebuilt master cylinder. But most importantly, the bike is now being ridden by its intended rider  8).

I'm still looking to throw on some crashbars, need to look through my options on ebay.
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