SOHC.co.uk Forums > CB500/550

Sooty plugs.

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Johnny4428:
Now I am sort of giving myself a kick up the arse here. I had a nice run out yesterday on the k3 but quickly realised only 3 cylinders were firing. This is the second time this has happened to me this year on this bike. I got back home and checked cyl 2 and the plug was just sooted up then checked the rest and they were all sooty. Then the penny dropped that I had replaced the pilots with 45’s instead of 42’s but had made no compensating adjustment to mixer screws. As most of my running around here is in the lower to mid range rpm it stands to reason that it is getting slightly too much fuel! The reason I changed the pilots was to improve cold starting which it did do. So today I will make an adjustment to the carbs and take for another run, since it is a nice day.

deltarider:
What bike?

Johnny4428:
550k3

Johnny4428:
Just a follow up, had a run out this afternoon probably about 40 miles or so having reset screw to one turn out. Bike was running great. After returning to base I checked the plugs again. There was a bit of improvement, no4 was a nice colour while 1 2 and 3 was a bit black still. Now reduced these screws by a further 1/4 turn. Will see how the next run goes.

Sesman:
Hi, Johnny.

Out of interest which carbs are you using and what size main jets are installed? I presume you are running with the standard airbox, using a standard exhaust?

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