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Author Topic: not getting fuel to cylinder 4  (Read 2391 times)

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MartimusPrimus

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not getting fuel to cylinder 4
« on: June 20, 2006, 12:16:03 PM »
just like the topic says I'm not getting any fuel to cylinder 4 on my 77 cb750k any ideas?
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Offline dusterdude

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Re: not getting fuel to cylinder 4
« Reply #1 on: June 20, 2006, 12:33:47 PM »
if its getting to cyl 3 and not 4,you have a blockage before the gas gets to number 4.shouldnt be too hard to find.
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mark
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Offline TwoTired

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Re: not getting fuel to cylinder 4
« Reply #2 on: June 20, 2006, 12:34:37 PM »
Stuck float
stuck float valve
Blocked fuel supply passageway.
Blocked fuel jets.
Intake valve not opening.
#4 piston not moving.
Ornery, stubborn gas.
Portal to an alternate time and space has developed in your intake runner.


What have you looked at?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline dusterdude

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Re: not getting fuel to cylinder 4
« Reply #3 on: June 20, 2006, 12:37:42 PM »
ill go with the time portal.
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mark
1972 k1 750
1949 fl panhead
1 1/2 gl1100 goldwings
1998 cbr600 f3

MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #4 on: June 20, 2006, 12:38:07 PM »
I checked to make sure I am getting spark and compression yes to both the valves look good I even took the carb assembly off and cleaned the float and needle that seems to move nice and freely
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Offline BobbyR

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Re: not getting fuel to cylinder 4
« Reply #5 on: June 20, 2006, 12:57:14 PM »
Even though the float is working it does not mean there is gas for it to float in. Turn on your fuel and run the drain line for that carb into a bottle, open the fuel drain. If nothing comes out your problem is upstream, if there is fuel in the bowl, your problem is in the carb itself.
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MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #6 on: June 20, 2006, 01:07:11 PM »
the carb is getting fuel
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Offline StevieMac

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Re: not getting fuel to cylinder 4
« Reply #7 on: June 20, 2006, 01:16:52 PM »
Clogged pilot jet would be my guess if you're getting fuel to the bowl.
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Offline TwoTired

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Re: not getting fuel to cylinder 4
« Reply #8 on: June 20, 2006, 01:27:13 PM »
Stuck float
stuck float valve
Blocked fuel supply passageway.
Blocked fuel jets.
Intake valve not opening.
#4 piston not moving.
Ornery, stubborn gas.
Portal to an alternate time and space has developed in your intake runner.

....Only three more to eliminate!
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #9 on: June 20, 2006, 01:35:39 PM »
well I dont think it could be the gas cause it will idle just wont do much more than that.
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Offline ieism

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Re: not getting fuel to cylinder 4
« Reply #10 on: June 20, 2006, 01:47:53 PM »
You can also eliminate the Portal to an alternate time, cause I have one of those in my ignition and I haven't seen any of your fuel flow trough it...(yet) ;)
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smashme33

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Re: not getting fuel to cylinder 4
« Reply #11 on: June 20, 2006, 02:01:09 PM »
 Looks like a jet issue to me...

 Ha! ORNERY is a funny word because it reminds me of Waterboy!
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Offline TwoTired

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Re: not getting fuel to cylinder 4
« Reply #12 on: June 20, 2006, 02:06:05 PM »
It will idle on three cylinders...lumpy.

How even are the head pipe temps?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #13 on: June 20, 2006, 02:24:09 PM »
mmmmmmama said aligators are ornery because they have all those teeth and no toothbrush

as far as the heat temps go pipes 1-3 get nice and hot while 4 remains cool
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Offline 750goes

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Re: not getting fuel to cylinder 4
« Reply #14 on: June 20, 2006, 02:29:11 PM »
Put a replacement plug in number 4 or swap with another cylinder - what happens now to pipe temperatures??
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MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #15 on: June 20, 2006, 02:30:41 PM »
I have already checked for spark and compression both are fine
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Offline 750goes

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Re: not getting fuel to cylinder 4
« Reply #16 on: June 20, 2006, 02:33:00 PM »
doesn't mean you have a good plug in there... it could be breaking down or firing intermittently, what was the colour of the plug in number 4 when you checked for compression and spark??
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MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #17 on: June 20, 2006, 02:37:22 PM »
it was a brand new plug
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MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #18 on: June 20, 2006, 02:39:43 PM »
good news my friend that I bought the bike from is on his way over with a complete set of carbs for my bike that he bought for it and rebuilt for spares so I'll throw those on probally later on tonight when it cools down and see how that works out for me.
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Offline Bodain

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Re: not getting fuel to cylinder 4
« Reply #19 on: June 20, 2006, 02:44:58 PM »
I guess my first question would be. How do you know that?

Or would a better statement be. Number 4 isn't firing.
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MartimusPrimus

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Re: not getting fuel to cylinder 4
« Reply #20 on: June 21, 2006, 05:49:24 PM »
ok I have the newer set of carbs soaking to clean them up good and just for #$%*s and giggles I sprayed some starting fluid in the air filter for carb 4 and the damn thing fired right up any ideas to what the problem may be?
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Offline Bob Wessner

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Re: not getting fuel to cylinder 4
« Reply #21 on: June 21, 2006, 07:06:52 PM »
Sounds to me like the starting fluid substituted for the fuel it's not getting. What other cleaning was done to the carbs besides the soaking? Are you sure all jets, emulsion tubes and passages are clear?
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