SOHC.co.uk Forums > CB500/550
Revs rising on tickover
paulbaker1954:
Started bike today for first time in weeks.
Left to warm up and tickover keeps randomly jumping to around 2k. Drop back down with idle screw and then does it again.
New plugs, carbs clean, Boyer ignition recently fully tested at Boyer, idle mixture set ok and carbs balanced
Anyone any bright ideas? I seem to recall a similar post a while ago
Nurse Julie:
With everything you have done and changed recently Paul.... it can only be one thing, an air leak.
paulbaker1954:
--- Quote from: Nurse Julie on December 01, 2019, 04:42:24 PM ---With everything you have done and changed recently Paul.... it can only be one thing, an air leak.
--- End quote ---
No chance I am afraid, new OEM rubbers and new really tight clips and new o rings on head/manifold as well
Nurse Julie:
--- Quote from: paulbaker1954 on December 01, 2019, 04:49:45 PM ---
--- Quote from: Nurse Julie on December 01, 2019, 04:42:24 PM ---With everything you have done and changed recently Paul.... it can only be one thing, an air leak.
--- End quote ---
No chance I am afraid, new OEM rubbers and new really tight clips and new o rings on head/manifold as well
--- End quote ---
Mmmm, only other obvious thing I can think of then is the plugs. I know you have fitted new ones but I take it they are NOT resisted plugs along with resisted plug caps?.
Mr Helicop:
I had the exact same problem and I thought I had tried everything, I don't know which carbs you have but mine had the wrong pilot screws fitted, should be solid rather than drilled ones which also have a different profile, I had also fitted a cheap set of jets and needles, I rebuilt he carbs again with the right jets and pilot screws and put a lot of effort into cleaning the pilot circuit which is covered in detail on the forum somewhere. I have 069 carbs. Mine now runs and ticks over a treat at all temperatures, and I am running on pod filters with standard jets.
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