SOHC.co.uk Forums > CB500/550

CB550K - engine rebuild (partial or full)

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deltarider:

--- Quote from: Erny on October 25, 2020, 10:42:07 PM ---... even I felt during ride on low RPMs like engine running on 3cyl only occassionally... This is new behaviour to me. It feels like I ususally feel after bike washing (I did 1 week ago), engine does not rev more than 6k (feels like ign issue)

--- End quote ---
  Without having studied the rest of your post, this phenomenon is classic for a CB500/550. These bikes have always been praised for their overall reliability with one exception: plugcaps and plugleads especially in rain. Also: when was the last time you've checked the resistance there? You could start with checking the total resistance from one plugcap via the coil to the other plugcap. Realise that new resistor plugcaps are around 5kΩ each. The coils secundary itself is around 14-15kΩ, so with both plugcaps attached, you should read 24-30kΩ in total. When you read over 30kΩ in total, unscrew both plugcaps to be tested individually. Over time the plugcap's resistance tends to increase. When over 8kΩ, replace. Do not run and resistor caps and resistor plugs. When you have the choice, I'd prefer resistor caps over resistor plugs. Verify plugcaps are firmly connected to the wires and there's no arcing. Be aware this may occur intermittently. It's best seen in the dark.

gbjeppm:
Maybe I missed it, but have you checked your valve clearances and reset the cam chain tension yet?

After doing that to my CB550K it quietened down considerably.

Erny:
Yes I did. Several times. No change.

deltarider:
Ignition needs to be checked once more, as there's clear indication there is a misfire. You could do a simple RPM drop test by shorting one lead at the time. Do not just pull the cap whilst running, as the coil may not like it.* The somewhat darker plug, which # is it? About the primary chain noise, sorry, but I don't find it excessive. All CB500s I've heard, had similar @ idle. As long as noise vanishes under load, what's the problem? If you're going to undertake a renewal, I'll read your posts with interest ofcourse, but know that I have read (in the international forum) more than once that after renewal, owners had the noise reappear a few thousand kms later...
BTW, I love the sound of that repro set!

* Having seen Ashimoto's technical gear in his thread (Alladins cave) reparing his coils, I wonder what electronic parts one needs to build a device that can switch 4A at up to let's say 170 Hz. I'd like to build that, if it's not too expensive.

Bryanj:
Ask Ash, i am sure if he built it he will tell you

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