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Author Topic: Carbs again  (Read 1083 times)

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Offline cb750fbomb

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Carbs again
« on: April 16, 2009, 10:24:16 AM »
OK. So I pulled the slow jets and cleaned them, replaced the #1 carb body due to a melted accel. pump jet ( ??? PO had hell of a backfire ???), pulled the throttle sleeves and cleaned them, bench synced them as well as I could to match #2 and replaced my old accel. pump tubes due to leakage checking that all worked well. The accel. jets weren't spraying and now they are. Now I can't even get her started. It will run for a few seconds if it's throttled, so I adjust the idle thinking it's not set high enough. No help. The carb boots are seated flush. Choke is on and it won't start without full choke. I tried several choke positions. The throttle is smooth and snapping back well. The slot in the throttle sleeves are all going the same way and the they had obvious marks as to which way they were before. The battery has a charge above 12 v. After lunch I'm going to make sure all bowls are getting gas. I know 1 and 3 are because I forgot to tighten the drain screws. The bike was running before I pulled the carbs again, but the throttle wasn't responding for sh*t and was told that I needed to clean the slow jets. Used an E violin string, with no force, along with carb cleaner to clean the slow jets and could see through them after cleaning. Also the little emulsion holes were clear.

Any suggestions. I know with carbs it seems like it could be a million things, but........
« Last Edit: April 16, 2009, 11:37:24 AM by cb750fbomb »
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Offline HavocTurbo

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Re: Carbs again
« Reply #1 on: April 16, 2009, 12:18:42 PM »
Sounds stupid....

But if you took the accel pump apart...

Did you put the spring on the right side of the membrane?

Aside from every carb getting gas I'm at a loss as well.

Probably something obvious I'm sure.  :D
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Offline cb750fbomb

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Re: Carbs again
« Reply #2 on: April 16, 2009, 09:45:57 PM »
It's under the membrane. As in the bottom. That's they way the fiche makes it look. Is that correct?
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“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 Spanner 1

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Re: Carbs again
« Reply #3 on: April 16, 2009, 10:19:17 PM »
Ya, unter, nein uber, ist self verstentlish, Bombe !
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If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....

Offline HavocTurbo

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Re: Carbs again
« Reply #4 on: April 16, 2009, 10:20:17 PM »
Quote from: cb750fbomb on April 16, 2009, 09:45:57 PM
It's under the membrane. As in the bottom. That's they way the fiche makes it look. Is that correct?

If it's like the parts fiche then it should be fine. Only reason I said that was because I put mine in wrong and it wouldn't run if you even thought about touching the throttle.
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Offline Hush

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Re: Carbs again
« Reply #5 on: April 16, 2009, 10:51:21 PM »
Did the same thing on my 650, other dumb thing I did was put the floats (all 4 of them) in upside down, cos it looks right when it's wrong eh!
You gotta see them like little pairs of shoes. ;D
Not much we can add until you check gas flow to all carbs, then once we can discount the fuel supply we can beat you up on the carb adjustments. :D
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Offline cb750fbomb

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Re: Carbs again
« Reply #6 on: April 17, 2009, 01:56:58 AM »
Quote from: Spanner 1 on April 16, 2009, 10:19:17 PM
Ya, unter, nein uber, ist self verstentlish, Bombe !

OK. So I WAS right. Est gut  :)
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Offline cb750fbomb

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Re: Carbs again
« Reply #7 on: April 17, 2009, 03:17:13 AM »
Quote from: Hush on April 16, 2009, 10:51:21 PM
Did the same thing on my 650, other dumb thing I did was put the floats (all 4 of them) in upside down, cos it looks right when it's wrong eh!
You gotta see them like little pairs of shoes. ;D
Not much we can add until you check gas flow to all carbs, then once we can discount the fuel supply we can beat you up on the carb adjustments. :D
If I'm getting gas to all 4 carbs I'll just have to take them off and screw them up some more  :)
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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 cb750fbomb

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Re: Carbs again
« Reply #8 on: April 17, 2009, 04:34:42 AM »
I have to add that at this point it was really silly of me to think that my bike would work. Is this all a farce and no ever really gets these running?
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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 cb750fbomb

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Re: Carbs again
« Reply #9 on: April 17, 2009, 08:16:51 AM »
The carbs weren't getting gas because the fuel hose was bent.  :-\  I got it and kept it running, but the idle is real inconsistent. The throttle is weird too. I'll rev it and it will stay reved up to 2k-3k rpms and then slowly come back down. Thinking it might have warmed up, I adjust the idle for the rpms to drop out and stall if I don't idle it back up. Runs with choke on or off.
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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 Spanner 1

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Re: Carbs again
« Reply #10 on: April 17, 2009, 09:27:11 PM »
Could Hush be right ( above ) ?....I think, for a break, it might be time to remove that points cover and set the points gap and the timing.....no air and gas need be sucked anywhere to achieve timing...good 'therapy' for you at this point !
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If your sure it's a carb problem; it's ignition,
If your sure it's an ignition problem; it's carbs....
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