SOHC.co.uk Forums > CB500/550
CB 500 K1 running issue
Sesman:
I’d say the idle circuits are clear.
K2-K6:
--- Quote from: Sesman on September 19, 2022, 06:54:15 PM ---I’d say the idle circuits are clear.
--- End quote ---
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.
Beefington1975:
--- Quote from: K2-K6 on September 19, 2022, 07:02:58 PM ---
--- Quote from: Sesman on September 19, 2022, 06:54:15 PM ---I’d say the idle circuits are clear.
--- End quote ---
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.
--- End quote ---
I haven't tried that. Will do tomorrow and report back. Thank you
Beefington1975:
My latest fiddlings suggest that the bike is running too rich a mixture at idle - brand new plugs covered in soot after just a few minutes of running. Is this the root cause? Or a symptom?
McCabe-Thiele (Ted):
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.
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