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Rebuilt carbs, new O-rings, now unsteady idle. Ideas?

  • Thread starter Thread starter G.S.Joe
  • Start date Start date
'Have you replaced the o-rings behind the intake boots which bolt to the head? s the rubber on the intake boots themselves hard and cracked? You may have a vacuum leak there'....as matt110 said. Often overlooked or forgotten .This is a huge vacuum leak area.If those 4 large O rings are bad all the proper measures of cleaning and tuning etc.will not produce results.
 
chuck hahn said:
Puffs of blueish white oil smoke or is it like a water vaporish kind of puffs??

Wonder if you've got an ignition problem as well? Bad plug caps ( bad resistors inside the caps), cracked wires arching to the engine? Does it have points and condensors still or change to electronic ignition? Timing set right?
Click to expand...


Too thick to be water vapor in my opinion. You could actually hear the puffs. I didn't notice a bluish tint, but given that it looks nothing like vapor and lasted too long I'm guessing it must be oil.


I don't know enough about ignition to say whether it has condensers or electric, but I believe it to be stock. I'd check but I'm at work now. I did not check the timing, that was next on the list after a compression check.

BUT... I fired it up before checking compression and it fired up easily. Said "ok", left it on prime, and let her warm up. Backed off the choke, and for reasons I do not understand idled nicely. I tweaked the idle screw and rode her around for an hour. Stopped and started over a dozen times, ran great, no issues. Didn't even pop with rev/gear changes.


I don't understand this. Clearly there's still a problem somewhere. I'm running her on prime for now as I'm putting every penny towards my car right now, but when funds are freer I'll pony-up and get a new petcock and other things. Those rebuild kits were a waste of time.
 
chuck hahn said:
Well if it will run for 5 minutes on PRIme with the choke added. I would say two, things are combining to form a perfect storm.

1...even if they were cleaned, theres still a clog somewhere in the pilot circuit and

2..the petcock isn't operating right. Not open ing with the vacuum like it should be doing. Petcock is probably gone bad.
Click to expand...

Likely agreed on #2, but with #1 I ran gauge pins through all holes. Not to say that I couldn't have stirred something up and re-clogged it. I did a thorough job cleaning the tank, but with all the pulling off and putting on parts over and over checking for things I could have easily gotten guck in there.
 
elrico said:
'Have you replaced the o-rings behind the intake boots which bolt to the head? s the rubber on the intake boots themselves hard and cracked? You may have a vacuum leak there'....as matt110 said. Often overlooked or forgotten .This is a huge vacuum leak area.If those 4 large O rings are bad all the proper measures of cleaning and tuning etc.will not produce results.
Click to expand...

I replaced the intake/head rings and they were in horrible (flat and cracked) condition. Overall bike runs much better after that and a carb rebuild, valvecover gasket, plugs, etc. My boots are very soft surprisingly so I did not replace them. Also has to do with the cost of them and my suspicion of the petcock. Though she runs great now it's only on prime. I can track down a vacuum leak, it'll just take time. I may buy a new petcock when the budget affords just for piece of mind.
 
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