Low Speed Circuit Air Inlet?

[Forge]

Which of the 4 air jet openings below the air horn on the intake side of the carbs feed the slow speed/pilot circuit? I want to pull my fuel tank, airbox, and remove the air horn covers and spray carb cleaner and compressed air into the air opening for that circuit. I have pulled my carbs a couple of times and blew carb cleaner and compressed air into the slow jet and pilot screw openings until cleaner sprayed up through the 3 transition ports easily and now I still have 1 or more pilot circuits missing.

I am wondering if the air intake side of the circuit on one or more carbs is plugged and instead of pulling the carbs again, I want to try and make sure they are open by spraying cleaner directly into the intake openings. I will pull the diaphragms first to make sure I don't get cleaner on them. I only want to spray into the pilot port, so I want to see if anyone can let me know which one it is. I sprayed into all of them while cleaning (or attempting to clean) the carbs while they were completely disassembled and split, but perhaps they need more clearing. I remember cleaner coming out of different locations corresponding to different air openings in the air jets, but don't remember which was which.

Thanks in advance.

[Bighead]

Dont know what you are calling the air horn. But just because cleaner sprays through the jets does not mean they are clean.

[Forge]

Dont know what you are calling the air horn. But just because cleaner sprays through the jets does not mean they are clean.

The air horn is the silver tube that sticks out of the carb air inlet. The air horn cover is the black plastic plate that mounts over the air horn and holds it in place along with the rubber gasket.

[98valk]

remove the idle mixture screws, make sure the washer and o-ring come out and spray into there. easiest way to clean. yes remove the slides and put some a rag over the opening before u spray.

[Forge]

remove the idle mixture screws, make sure the washer and o-ring come out and spray into there. easiest way to clean. yes remove the slides and put some a rag over the opening before u spray.

I’ve done that when the carbs were off the bike. Spray was squirting out of the 3 transition ports in the throats of the carbs. The last time I did it, green laquer colored spray came out of one of the air jets at the carb inlet side when I blew air into it after the spray. Spray came out of others, but I don’t recall it coming strongly out of all of them. I suspect that the air inlet side of the circuit may be blocked or partially blocked between the air jet and where the transition ports are. If this doesn’t work, I’ll pull the carbs again and repeat the cleaning process.

[Ricky-D]

I don't understand what you mean by "feed the slow speed/pilot circuit", but all four openings are operational depending upon the position of the throttle valve.

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[pancho]

Hey Forge,,  I you are talking about the air that is used for combustion on the idle circuit/slow speed, it is what is allowed to flow past the butterfly.   These are individually adjustable by screws when doing the carb sync.  


Not completely sure that is what you are asking about,,,