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Author Topic: Anyone with the pumper carbs out there have particular trouble with carb #2?  (Read 856 times)

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Offline cb750fbomb

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Anyone with the pumper carbs out there have particular trouble with carb #2?
« on: November 04, 2009, 12:05:17 PM »
High everybody. I've been lurking and reading but have not needed to ask any questions in a while. Thanks to this site I have been able to resolve my issues without a lot of questions :) Anyone with the pumper carbs out there have particular trouble with carb #2? I have cleaned this carb, changed the float needle and polished the needle seat repeatedly, but the float continues to stick which causes different problems at different times. The last two days, for example, it's been making the idle hover around 2500-3000 rpm once the engine warms up to normal operating temperature because it's constantly metering too much gas. It's doing this with the idle adjustment all the way out. I just pulled off the pods and there was gas pooled at the mouth of the carb. I'm about to dig into them again.

77 CB750F2 - as is in my signature
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'77 CB750F2
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Offline Inigo Montoya

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #1 on: November 04, 2009, 12:18:26 PM »
Have you cleaned out the area where the pin goes? If it is not moving freely there, it could cause issues.
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Offline cb750fbomb

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #2 on: November 04, 2009, 01:00:21 PM »
I will do that. I noticed that at least one of the pins didn't move freely, but the float did.
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline Inigo Montoya

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #3 on: November 04, 2009, 01:41:04 PM »
The thing to check for is binding when moving the float up and down by hand at any angle.
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Offline eurban

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #4 on: November 04, 2009, 02:33:54 PM »
Also make sure that the float doesn't have any liquid inside it.
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Offline Inigo Montoya

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #5 on: November 04, 2009, 04:15:04 PM »
Another possibility but I don't know if that is possible with the later floats.
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Offline cb750fbomb

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #6 on: November 04, 2009, 04:27:59 PM »
Already changed the float
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”

Offline MasterChief750

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #7 on: November 05, 2009, 02:04:46 AM »
have you checked for proper adjustment of the float. i had a similar issue with my 78 k, the floats were way off. another thing, is the bowl draining onto the ground.
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Offline cb750fbomb

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Re: Anyone with the pumper carbs out there have particular trouble with carb #2?
« Reply #8 on: November 05, 2009, 11:39:31 AM »
the float is adjusted correctly I believe. It the lowest it can be within spec. What do you mean by draining onto the ground? If you mean draining from the bowl drain there is gas coming out there. That's how I notice the float is getting stuck. When I pulled the tube of the drain there was a bit of gas in it besides the gas sitting in the mouth of the carb.
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'77 CB750F2
“The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.”
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