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CB 550K3 suddenly running very lean

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deltarider:
Maybe first try running a tank with added an additive like Tunap or Forté (don't know what brands you have in the UK). I used it years ago and it did miracles. Might help and it's easy to do.

Bryanj:
Believe me the pilot jets cause all sorts of agro and are a known arse

Ashdowner:
Yeah I keep hearing that but nobody can say why except that they might clog up - which mine don't. I sometimes think that people are desperate to pin the whiplash from the primary chain when at idle on anything they can and the float levels and idle jests are usually the first choice

Bryanj:
I had a K3 in a chop and having gotten it perfect for MOT it stood 4 weeks and the pilots blocked up again so i know theu can be a swine, also there are very small washers and "O" rings on the air screws which if missing or in bad condition cause trouble.

Its a myth that only certain parts of the carb work at certain revs--they may have MORE affect at certain revs but fuel and/or air is going through all the pathways all the time

deltarider:

--- Quote ---Its a myth that only certain parts of the carb work at certain revs--they may have MORE affect at certain revs but fuel and/or air is going through all the pathways all the time
--- End quote ---
True, that's why I always look at these diagrams that show from how much throttle what works, with scepsis.

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