My two left carbs aren't working - Page 3 - Steve Saunders Goldwing Forums

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post #21 of 48 (permalink) Old 02-19-2018, 09:03 PM
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Originally Posted by redwing52 View Post
I would like someone to blow a little compressed air in that hole and see where it come out. I see a hole on the inside chamber that sort of matches up with the hole in question???.
I have an extra carb rack. I'll be taking it to the shop to tomorrow to investigate. There is a casting on the outside of the carb body. But as Dave said, there isn't a hole. None that I can see. It looks as if the hole has been closed by a bb shot from the factory.......
The operating vacuum for the diaphragm does indeed pass through the slide to the top of the diaphragm.
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post #22 of 48 (permalink) Old 02-19-2018, 09:04 PM
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Originally Posted by Ken Bergen View Post
This is the only picture I could find of the diaphragm cap, it's from a GL1500 but the same principle.
Hmmmmm... interesting Ken. You might well be right. Is your last picture of the diaphragm cover or the throttle body? If that is a picture of the throttle body it vents below the diaphragm. If you stuy the pictures I posted it vents above the diaphragm. Is it possible that hole keeps both/either side open to atmosphere so it can move freely? My problem is I can't imagine the slide moving so quickly with that small hole. The size of the chamber is large and to raise up it has to overcome the spring pressure as well. Could the air from top of the diaphragm go through that hole to the bottom and vice versa? Maybe someone with an old carb will blow compressed air in the hole and figure it out>>>
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post #23 of 48 (permalink) Old 02-19-2018, 09:05 PM
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Originally Posted by glhonda View Post
I have an extra carb rack. I'll be taking it to the shop to tomorrow to investigate. There is a casting on the outside of the carb body. But as Dave said, there isn't a hole. None that I can see. It looks as if the hole has been closed by a bb shot from the factory.......
The operating vacuum for the diaphragm does indeed pass through the slide to the top of the diaphragm.
Another puzzle.

Mike

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post #24 of 48 (permalink) Old 02-19-2018, 09:42 PM
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Obviously, I haven't been to work yet, but have a theory. I'll let everyone know tomorrow. But for right now, I suspect both vacuum sources are used. The small port in question, at just off idle may allow initial vacuum to the diaphragm though a "ported" vacuum source. A transition circuit, if you will. At which point, venturi vacuum takes over and modulates the slide accordingly?

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post #25 of 48 (permalink) Old 02-19-2018, 09:55 PM
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On some carbs of this type that hole is connected to the enrichening valve to raise the slide slightly when "choked". Why it's used on some and not others I don't know.

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post #26 of 48 (permalink) Old 02-19-2018, 11:11 PM Thread Starter
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Originally Posted by DaveO430 View Post
There is no hole there. They work as Redwing described. Have you checked the plug wire position yet? 1234 right to left on the coils.
I'll check, but I think that If the wires were in wrong position, all four carbs will work bad.
But to be sure, I'll check.

On the other end, this Thread starting to go to the correct direction.
To my opinion, The only thing that is counter to the spring is this vacuum port.

lg, waiting for your check!
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post #27 of 48 (permalink) Old 02-20-2018, 06:35 AM
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I'll check, but I think that If the wires were in wrong position, all four carbs will work bad.
But to be sure, I'll check.

On the other end, this Thread starting to go to the correct direction.
To my opinion, The only thing that is counter to the spring is this vacuum port.

lg, waiting for your check!
Only the ones that are out of position wouldn't fire. If you have 1&3 correct and 2&4 backward 1&3 will still fire. You are entitled to your opinion but you are wrong on that vacuum port.

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post #28 of 48 (permalink) Old 02-20-2018, 08:47 AM
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With two on backwards or out of order they will fire on the exhaust stroke and cause firecracker loud backfires. To the original poster, have you traced the wires and proven that they are on correctly?
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post #29 of 48 (permalink) Old 02-20-2018, 09:46 AM
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With two on backwards or out of order they will fire on the exhaust stroke and cause firecracker loud backfires. To the original poster, have you traced the wires and proven that they are on correctly?
He seems determined to have a carb problem and not interested in looking elsewhere.

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post #30 of 48 (permalink) Old 02-20-2018, 01:07 PM Thread Starter
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I'm not determent at nothing.
Checked the electric side before and find nothing, but about the coils wire I don't remember, so I'll check!
To solve the problem I'll check everything you'll say.
I even opened the left head cover to check the valves shims.
Thanks for your help.
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