SOHC.co.uk Forums > CB500/550
CB 500 K1 running issue
K2-K6:
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 ?
Beefington1975:
--- Quote from: McCabe-Thiele (Ted) on September 20, 2022, 06:24:37 PM ---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.
--- End quote ---
I wish it would run long enough to ride 10 miles!
Beefington1975:
--- Quote from: K2-K6 on September 20, 2022, 06:25:54 PM ---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 ?
--- End quote ---
Hi. I didn't need to use the choke to start the bike. Ran the bike long enough to perform the check you described. Have to be honest and say that the changes in rpm were very slight so not sure I got the screws spot on. The are set to about 1.5 turns out.
The air filter isn't new, but looks good (not that old). The choke opens and closes easily and fully
Many thanks
K2-K6:
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.
Beefington1975:
--- Quote from: K2-K6 on September 20, 2022, 07:11:26 PM ---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.
--- End quote ---
The idle jets are 40s. I'll try the aircrews at 2.5 turns out and take it for a spin (won't be able to do this for a couple of days though). Many thanks for the help so far.
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