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main jet o rings suspect?oversize drilled jets?get the float height correct,remove the exhaust and try it,might have a blockage?
The slide needles will have a number on them, that would be nice to know.
Is there soot collecting in the exhaust?
Also, are all the spark plugs showing the same deposit color and pattern.
It might be worthwhile the "prove" the air jet and carb body passageways are clear.
did you scheckt the advancer from the ignition
When you ran it with no airfilter did you leave the airbox lid off as well?Did you try turning the fuel tap off & keep riding to see if it picks up before it dies?Tried pulling the choke on a bit when it starts to bog?
not sure about the fouled plugs, but could the stumble be caused by insufficient fuel delivery? is the in-tank filter free of debris? also, try running the bike with the fuel cap loose to rule out a clogged cap vent. good luck.
The bike doesn't "cut out" electrically at 5000rpm it just gives all the symptoms of a rich condition.
Read you last post TT, and agree that the needle jets can become worn, but would think with only 6K+ this shouldn't be an issue. However these aren't the original carbs so....
Quote from: Tintop on June 26, 2011, 12:21:10 PMRead you last post TT, and agree that the needle jets can become worn, but would think with only 6K+ this shouldn't be an issue. However these aren't the original carbs so.... Actually, I haven't seen the CB500 or Cb550 Carbs wear the needle jets, or the needles. They don't normally have any contact with each other. But, they aren't the original carbs, and if they were they would be dirty by now. So, I assume they were cleaned, and the emulsion tubes can be stuck pretty well in the carb bodies. Since they are driven out from the jet orifice end, there is opportunity for them to be damaged there. And, that is why they are worth checking.You ignition point is well taken, though. It is possible for the condensers to be out of spec. and cause marginal spark at higher RPMs. Odd that they would both fail in such a way at exactly the same time. But, it is possible for random events to coincide.It doesn't seem congruent with having all clean plugs while the problem is present, though.Cheers,
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