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Author Topic: Just Bought a 78cb 550FOUR k & had a few questions  (Read 725 times)

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Offline 1ate7records

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Just Bought a 78cb 550FOUR k & had a few questions
« on: June 18, 2011, 07:42:43 PM »
I just purchased a pretty mint cb550 of an old man for 1,000 with a little over 12,000 miles on it. When ever you first start it it knocks until it is warmed up. It also stops knocking when i pull the clutch lever in. I'm not the most familiar with bikes so i couldn't say exactly where the knocking is coming from.  Any helpful ideas would really be appreciated.
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Offline TrueSpin

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Re: Just Bought a 78cb 550FOUR k & had a few questions
« Reply #1 on: June 18, 2011, 07:56:18 PM »
The absolute first thing I would do is an oil change. You don't know how long that thing sat.
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Offline WarwickE36

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Re: Just Bought a 78cb 550FOUR k & had a few questions
« Reply #2 on: June 18, 2011, 08:11:30 PM »
doubt its knocking per se... sounds more like clutch rattle due to un-synced carbs
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline That 70s Bike

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Re: Just Bought a 78cb 550FOUR k & had a few questions
« Reply #3 on: June 19, 2011, 11:25:33 AM »
Strange that it stop after warming up. Seems like the clutch is rattling (a little? a lot?) while engine is running rougher (cold)?
Some tweaking might eliminate it (afore mentioned carb syncing) 12k mi should be original clutch. Do the clutch cover torqued screws look untouched? If not, inspect the clutch & confirm all pieces are there & assembled per the parts diagram.
Maybe an oldtimer here knows this one ;)
Pretty Mint! Post a pic! :)
« Last Edit: June 19, 2011, 11:34:34 AM by That 70s Bike »
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CB750K6- survivor   CB500K2, CB550K2- projects

Offline TwoTired

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Re: Just Bought a 78cb 550FOUR k & had a few questions
« Reply #4 on: June 19, 2011, 12:33:18 PM »
Do the 3000 mile routine tune up and then have the carbs vacuum synced.

Is the "knock" still there?
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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

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Offline WarwickE36

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Re: Just Bought a 78cb 550FOUR k & had a few questions
« Reply #5 on: June 19, 2011, 02:02:34 PM »
Also make sure ignition timing is spot on... if the original points system is still there make sure the gap is right on the money...

I have a Dyna-S in my 550 that the previous owner installed.  I assumed he did the timing right when he installed it as the bike did run, pretty well actually after the carbs got all situated.  however, he didnt set the timing right, 2/3 were off a few degrees fully advanced.   I tweaked it and the "koncking" at idle subsided a noticeable amount. 

also...where is the bike idling currently?
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s
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