SOHC.co.uk Forums > CB500/550
Hanging Idle and poor throttle response.
JezzaPeach:
Very many thanks. Good to understand. I get some plug sooting but probably a combination of general wear, valve guide seals, and jets worn slightly oversize. It seems to be getting better with more decent longer runs, but fresh jets would be a nice treat in future.
Sesman:
FM. Judging from that historic post it’s still unclear.
Personally I very much doubt the jet is more than a simple drilling, unless somebody would care to produce evidence to the contrary.
Skoti:
--- Quote from: JezzaPeach on August 22, 2022, 04:56:57 PM ---Very many thanks. Good to understand. I get some plug sooting but probably a combination of general wear, valve guide seals, and jets worn slightly oversize. It seems to be getting better with more decent longer runs, but fresh jets would be a nice treat in future.
--- End quote ---
The carb needle jets wear out far quicker than other jets due to needle vibration from the engine when the throttle slides open and close.
Most people ignore them and waste cash on the easy to change jets instead, just like I did with my CB750.
New needle jets instantly cured my lumpy slow running and sooty exhaust problems.
You probably require 1601-232-3004 needle jet kits X 4.
Not cheap for a CB500K1 tho...
Good luck
Skoti
Oddjob:
I have about 3 sets of carbs apart right now. I'll check all the pilot jets to see if any show any sign of ANYTHING down inside them.
I do think some jets have this feature just not these, the small holes are meant to be the atomisers for the fuel.
Sesman:
Cheers Oddjob.
Looking forward to the outcome.
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