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Author Topic: Cylinder #2 not firing at Idle.  (Read 463 times)

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Offline Jimsun

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Cylinder #2 not firing at Idle.
« on: April 14, 2014, 10:08:43 am »
Hey guys,

I finally fixed the carb leak on carb one. My last problem now is cylinder 2 not firing at idle. She will only fire once i open the throttle. I have taken the carbs aparts to pieces and i have reassembled them back together after cleaning them. AFAIK, carb #2 is using all the stock parts (cleaned and reused),,

This is what I have done.

1/ cleaned carbs
2/ timing chain
3/ points
4/ checked for spark
5/ checked plugs after a ride and they were very good no black or white. but a nice bronze
6/ i played with the air screw (lean/rich mixture)
7/ synched the carbs

What am i missing? Could it be the idle jet is bad?
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Offline TwoTired

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Re: Cylinder #2 not firing at Idle.
« Reply #1 on: April 14, 2014, 10:34:18 am »
Could be idle/pilot jet or circuit, fuel height in the carb bowls, or low compression in the cylinder.
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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 Jimsun

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Re: Cylinder #2 not firing at Idle.
« Reply #2 on: April 14, 2014, 11:27:51 am »
Quote from: TwoTired on April 14, 2014, 10:34:18 am
Could be idle/pilot jet or circuit, fuel height in the carb bowls, or low compression in the cylinder.

Thanks TT, ill look inside that.

Do you happen to know what this green stuff is?

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Offline TwoTired

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Re: Cylinder #2 not firing at Idle.
« Reply #3 on: April 14, 2014, 01:33:22 pm »
My first thought was verdegris, particularly due to the age and unknown storage condition of the machine in the picture.

Something acidic in the fuel leaching and converting the copper out of the brass alloy carb components.  See any pitting or metal loss in those components?  Has the bike/carbs stored gasahol for a longer time period than 3 months? 

Another thought...
Some gas companies used to add dye to their gas.
In aviation, green tint meant 100/130 octane gas.  I haven't seen that is quite some time, though.
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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 atm cycles

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Re: Cylinder #2 not firing at Idle.
« Reply #4 on: April 15, 2014, 04:38:39 am »
Had same thing goin on last
Week on a 76f I was working on.  I started bike turned off fuel and let it run out of gas. 1 carb was still full. Did that couple times. Pulled idle jet and it was clogged again. Blew it out and then ran fine. Changed inline filter


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Offline Jimsun

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Re: Cylinder #2 not firing at Idle.
« Reply #5 on: April 15, 2014, 07:37:32 am »
Thanks TT and atm

Ill look into that when it gets warmer again
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