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Mike's CB550 Project

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Nurse Julie:
Sorry for your loss Dom.

Oddjob:
You got any vac gauges Mike?

K2-K6:
As Ted has noted it in another thread,  thought I'd add something to the check list.

When it's "hanging" try gently bringing the choke into operation and see if that's going to slow down the idle.

But also don't forget the basic reality check of all cylinders firing, indication of operational idle fuel jets etc (even if they've been cleaned) do this by stating it cold, run 30 sec, then switch off. Now check exhaust headers for temp and any cold cylinder.  Cheap,and easy to do, a cold one and it'll never have competent idle running, whatever you do or adjust.

As noted in thread too with John's experience, they'll run with camshaft timed out by a tooth, but you'll get problems again getting it to run correctly.

Oddjob:
Or even better, buy a laser temp gun, dirt cheap these days and compare exhausts temps when it's running.

Mike_Berkshire:
I thought I would check the mixture screw settings were correct this afternoon as it’s easy to do and doesn’t require removing anything significant. Something possessed me to remove the mixture screws and check they didn’t have any muck in them - they didn’t. I put them back setting them at 1 turn out. The bike won’t run now. It fired on a couple of cylinders and then decided not to fire on any at all. Spark at all plugs but only cylinder 3 plug was ‘wet’ with fuel. I’m guessing I have dislodged some crud and bunged up the carbs so yet again I’ll remove them and give a good clean and re-synch. Plugs were very sooty too.

I don’t have a vacuum gauge

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