Suggestions for carb adjustments?

[bkuhr]

83 venture, long time in rebuild, 84 miles on new plugs, 29mpg , feels like slight miss at idle, runs fine otherwise. Run 1/2 can seafoam/full tank in this 84 miles. Refilled 2.9 gallons and add second 1/2 seafoam, but have not run anymore yet

pics of plugs

cyl #1 nice tan, came out slightly wet

cyl #2 hardly any coloring

cyl #3 hardly any coloring, came out very wet

cyl #4 vary carboned

 

My read of plugs, please correct me if you believe otherwise

#1 about ok

#2 super rich, likely not firing much-likely flooded

#4 too rich

 

Due to my concern of flooding, I rechecked float levels-mark with blue tape, bike level on lift. All seem ok to me

 

Due to #4 to rich pulled diaphram, pic of carbon on slider

Closed #4 idle screw 1/4 turn, all were set at 2 turns out.

 

At a loss what to check next, reading on needle shim mod, but if I am too rich, seems pulling slider needle out more would be going in wrong direction-is this correct?

 

Have not rechecked other diaphrams, but there were no holes or other problems during assembly. It is possible during assembly, diaphrams were not seated in grove correctly. would leaking diaphram cause my symptoms?

[Dano]

Just guessing, but you're not getting any fire to #4. 2 & 3 probably have the idle jets out to far. 2 to 2-1/2 turns is about right, unless a float is stuck. Check for any vacuum leaks. Did you pull the YICS chamber out and plug the intake manifold tubes? Good place to start right there if you didn't. Have you checked the TCI inputs and outputs?

 

Just a couple of things for you........

 

Dano

[bkuhr]

Just guessing, but you're not getting any fire to #4. 2 & 3 probably have the idle jets out to far. 2 to 2-1/2 turns is about right, unless a float is stuck. Check for any vacuum leaks. Did you pull the YICS chamber out and plug the intake manifold tubes? Good place to start right there if you didn't. Have you checked the TCI inputs and outputs?

 

Just a couple of things for you........

 

Dano

Thru me for a loop, I would have expected for someone to say maybe 2&3 were not firing, that was my next plan to start checking.

[Marcarl]

First off, get the seafoam through and cleaned out,,,, it just won't run right with seafoam in the mixture. Once you are down to fresh gas, pull the breather and check the diaphragms to makes sure they are all moving equally, if they are then sync the carbs, if not, you have a problem there, could be a bad seating or you could be missing the little O-ring that goes in the bottom.

When you get through those checks, report back.