SOHC.co.uk Forums > CB500/550
Running on three
gary123:
--- Quote from: K2-K6 on November 05, 2022, 01:02:50 PM ---Seems to confirm no fuel flow through that idle jet, which ultimately means clearing it. These can unfortunately (similar for any small flow jets on most carbs) require a few times cleaning when getting them going again. Frustrating, but often typical as any small amount of debris from anywhere in the system can get stuck in such small openings.
You could try firstly winding the air adjustment screw fully inwards while running it (gently) until it has no air supply (essentially the same as putting your hand on the carb, but just for the idle circuit) to see if anything soft that's restriction in there will get going again.
Otherwise it's pulling at least that jet and also blowing through the associated air passage to bring it back to fully operational.
OK Ill try all that. Thanks
--- End quote ---
JezzaPeach:
I think my 3 and/or 4 were slow filling up due to a combination of gummed up tank cap breather (due to over filling 🙄), a slope up in the fuel pipe, and maybe float height. After steady running it seemed like the fuel level was dropping so it struggled to reach the idle jet, being higher than the main jet, and wanted to stall, so it would run on the main jet with more throttle if I stopped, and then the fuel level ‘caught up’. Also while running, after running a bit, and changing down, blipping the throttle seemed hesitant.
I’m hoping I’ve sorted the tank cap by putting a rubber tube tight against the small hole and blowing plus squirting carb cleaner into the hole.
gary123:
Drained the bowls and there was an identical volume of fuel in each. So now Ive got the idle jet out . The hole that runs right through has some kind of restriction in it, is this how it should be, it looks like its meant to be there so I dont want to be ramming something down it.
McCabe-Thiele (Ted):
Try a wire out of a wire brush there is no restrictor just a tapered hole.
JezzaPeach:
There’s a whole debate about that, stand by! I didn’t see anything in mine as some were bunged up with deposits, and had to clear them out very gently using a kit of stainless slightly abrasive rods from eBay. If doing it again I’d use my digital vernier to measure the right rod. Some kits come with tiny brushes that are useful for the openings they fit in plus in my case the inlet. But best wait for more experienced comments.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version