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gsx550ef missing low revs

  • Thread starter Thread starter janner
  • Start date Start date
J

janner

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hi all, my new gsx550 misses and appears to be firing on three when on idle to fast idle , but once warm, if you crack the throttle open it revs cleanly without missing , and the missing disappears above fast idle altogether, the engine is very sweet and runs cleanly and without any noises, my question is where should i lok for the obvious before tearing things apart ? thanks jon

Forgot to say, that it has been fitted with new plugs
 
janner said:
hi all, my new gsx550 misses and appears to be firing on three when on idle to fast idle , but once warm, if you crack the throttle open it revs cleanly without missing , and the missing disappears above fast idle altogether, the engine is very sweet and runs cleanly and without any noises, my question is where should i lok for the obvious before tearing things apart ? thanks jon

Forgot to say, that it has been fitted with new plugs
Click to expand...
Let it idle a while and then pull spark plugs to see if one is wet; a while back my vacuum petcock allowed fuel to be sucked down into #2 cylinder ( the one that has vac line) causing a miss at idle,but not noticeable as revs went up.
 
Another very distinct possibility is the pilot circuit is clogged in one carb.

Might be foreign material in a fuel or air passage, might simply be a mis-adjusted mixture screw.

Yet another distinct possibility is mis-synchronized carbs. One carb might be opening later than the others.

.
 
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