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Author Topic: '74 CB550 resistor caps  (Read 1110 times)

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Offline CoachDoc

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  • 1974 CB550, 2005 GL1800, 1997 Valkyrie Standard
'74 CB550 resistor caps
« on: August 05, 2011, 06:15:51 PM »
I'm getting down to the final stages of a long drawn out restoration of my '74 550 (looking GOOD and getting very close to running good as well). I want to fine tune the ignition before I get into the carbs, and I am looking to install new resistor caps to replace the 37 yr. old originals. Is 5K ohms the correct choice? If so it would be the NGK XD05F (102 degrees/ 5K ohms). Correct???
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Offline TwoTired

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Re: '74 CB550 resistor caps
« Reply #1 on: August 05, 2011, 06:27:00 PM »
All my Cb550s had 10K caps on them originally.  I don't know if you can get those anymore, though.  5 k might be all you can get.
The caps had two different angles two were X and two were V, if I recall an earlier thread correctly.
I assume you have the NGK plug cap chart.

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 CoachDoc

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Re: '74 CB550 resistor caps
« Reply #2 on: August 05, 2011, 06:44:11 PM »
Yes, I have seen the NGK plug cap chart. I don't see a 10K cap listed, so this may be a problem. I do think you are probably right about 10K being the stock plug caps- I recall seeing that somewhere online in the past. What happens if I were to try to run the 5K caps???
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Offline TwoTired

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Re: '74 CB550 resistor caps
« Reply #3 on: August 05, 2011, 06:55:15 PM »
Quote from: CoachDoc on August 05, 2011, 06:44:11 PM
What happens if I were to try to run the 5K caps???
It's a little harder on point contacts and condensers, taxes them a bit more as the secondary current is increased.  If they are hardy parts, they'll survive.  But, you may have to replace them more frequently.

I assume you have the Cb550 stock coils?

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 CoachDoc

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Re: '74 CB550 resistor caps
« Reply #4 on: August 05, 2011, 07:00:41 PM »
Stock coils, true. One (1,4) I replaced about 15 yrs. ago when OEM replacements were still available. The other (2,3) is as old as the bike but it seems to be able to generate a decent spark. The bike runs pretty well on starter fluid and all pipes seem to get equally hot.
I guess Ill start looking around for 10K caps. thanks.
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