Topic: Air screw to reduce decel popping?

[Deltarider]

I had issue with fuel hoses that were slightly kinked. It caused fuel starvation in higher speeds.
Where the fuel connection is, in wrong angle.

Yep, it is often overlooked. I have seen it more than once when softer aftermarket tubes were used. Best advice I can give: have tubes at the original length and diameter.
I've distilled the correct dimensions of my CB500 tubes, knowing: 17 and 28 cm resp., in the apropiate parts list: https://www.honda4fun.com/dwnload/Part-List/CB500/CB500-K2-76-Parts-List.pdf On p.32 #15 and #16 we have partnumbers: 95001-55170-040 and 95001-55280-040.
On previous CB500 models which had the bowltype petcock, partnumbers were: 95001-55180-040 and 95001-552300-040. I don't know if Honda has applied this way of numbering for tubes on other models though.
Adding inline fuelfilters in CB500/550 tubes brings a risk.

[Bigmant]

I had issue with fuel hoses that were slightly kinked. It caused fuel starvation in higher speeds.
Where the fuel connection is, in wrong angle.

Just checked! Lines are not kinked any where and they are all genuine Honda replacements.

[PeWe]

Which model of carbs? Stamped on carbs.
- Is it really stock needles?
- Not cheap not usable aftermarket that look totally different in both lenght and taper?  If thicker, it will run leaner.

My 086A carbs (stock K6)
Had needles at 4th notch from top with 836, 4-1 and pods

Those carbs later on my K2
Same needle setting to run well. Tried middle first.

Changed to 064A carbs where 4th notch was too rich. Middle (3rd) a must. (These carbs have different needle taper/thickness)
Air screws 1 turn out.

[Bigmant]

Does anyone know why there might be two small holes in the roof of the float bowl in one carb and only one in the other? And could this be part of my problem? It makes me think the carbs might be different…

The carbs are stamped behind the backing plate which I don’t want to take off, before someone asks hahaha

[PeWe]

Carb model stamped like these photos
086A
064A

Other versions
7A, 657A

[newday777]

Does anyone know why there might be two small holes in the roof of the float bowl in one carb and only one in the other? And could this be part of my problem? It makes me think the carbs might be different…

The carbs are stamped behind the backing plate which I don’t want to take off, before someone asks hahaha

To share the bowl vent with the outside carb bowl.
You have 2 vent hoses, both hooked to the 2 and 3 carbs, because of the slide going down through the center blocking a pathway to go straight across the body, so they just add the second bowl vent hole in the 2/3 carbs, it's the pathway to the outside 1/4 carbs.

[Bigmant]

Does anyone know why there might be two small holes in the roof of the float bowl in one carb and only one in the other? And could this be part of my problem? It makes me think the carbs might be different…

The carbs are stamped behind the backing plate which I don’t want to take off, before someone asks hahaha

To share the bowl vent with the outside carb bowl.
You have 2 vent hoses, both hooked to the 2 and 3 carbs, because of the slide going down through the center blocking a pathway to go straight across the body, so they just add the second bowl vent hole in the 2/3 carbs, it's the pathway to the outside 1/4 carbs.

Got it! So totally normal then!