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I’d say the idle circuits are clear.
Quote from: Sesman on September 19, 2022, 06:54:15 PMI’d say the idle circuits are clear.Does seem positive from that report.Beefington, have you tried setting the idle circuit as per Honda manual to optimise the carbs as they stand now?It involves warmed engine, then winding outward individually ( successive carbs) until the rpm reaches a peak with that cylinder, then just as it starts to falter from mixture going too lean, turn it back inward to drop the rpm by 100. Then reset overall tickover speed with main control and move to next carb. Complete all four and that should be a reference setting for your engine equipped with those carbs and jets. This routine should establish if the very slow running is able to work correctly.
I'm no expert - far from it - I would judge how rich or lean an engine is running after say a ten mile ride - when engine has cooled check the plug colours.
If started on choke they'll be fairly black, should get lighter after some running if it's ok.Basics though, choke open and close fully without impairment? Air filter ok/clean/new ? Just to check the obvious.Moving on, what do you have the idle adjustment mixture screws set to now ?
Try with the screws set at 2 1/2 turns out and see if that gives anything in the way of sensible running, or improvement at all.It does appear to be too rich. Do you know which size of idle jet is fitted to them ?More rudimentary check is to remove air filter and see if that improves running. Really just trying to get further assessment to help indicate what may be out of kilter.
Just a thought...saw someone on another thread suggest that engine oil level could be a factor? I've checked mine and it's on the top line. The deposits on the plugs look dry, but could the fouling be due to excess oil???
What exactly is sooted? The thread's end? That's normal. Focus on the plugs nose, the ceramic insulator that is. Realise the CB500s plugs soot very easy at idle. Back then we used to ride these bikes. Nowadays and in this forum in particular, more and more owners seem interested in having a perfect idle they can listen to sitting in a deckchair.