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Burbling on decel - K&N?

  • Thread starter Thread starter UncleMike
  • Start date Start date
U

UncleMike

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Recently cleaned and re-oiled my K&N OEM replacement air filter. Not pods. Found I had most likely over-oiled it when I installed it so I took the advice I'd read on the forum and oiled it quite lightly.

I've been noticing a burbling when I decel. I've adjusted my mixture screws but now I'm down to around 1-3/4 turns. Everything on the bike is stock, except for the K&N.

Perhaps I under-oiled it this time and it's causing too much air to flow? I can't imagine needing to richen the mixture on a stock bike more than I have already, or is that normal?

I can't find any leaks anywhere else. All new boots last year when I re-did the carbs and the airbox has been sealed. Exhaust gaskets, perhaps?
 
chef1366 said:
As long as it's not popping I wouldn't worry about it.
Click to expand...

What's the difference between burbling and popping? It's not a full backfire by any means, but it's definitely sounding a bit like muffled popcorn.

Just can't seem to get these mixtures screws dialed in right.
 
chef1366 said:
Stock pipes hmmm
Are you running with the stock pilot jet?
Click to expand...

Yup. Only things changed from stock include the K&N and for my main jets I'm running 122.5s in all four instead of the 120s in 1&4.
 
It wouldn't hurt to try 2.5 turns open on the idle mixture screws to richen it up some. Also, oil the filter again. K&N's don't scrub the air that great so it's best to make sure it's well oiled.
 
Nessism said:
It wouldn't hurt to try 2.5 turns open on the idle mixture screws to richen it up some. Also, oil the filter again. K&N's don't scrub the air that great so it's best to make sure it's well oiled.
Click to expand...

I was under the impression that turning the screws out would let more air in - clockwise to richen, counter-clockwise to lean.
 
UncleMike said:
I was under the impression that turning the screws out would let more air in - clockwise to richen, counter-clockwise to lean.
Click to expand...

It's not an air screw, it's a mixture screw. An emulsion of fuel/air comes up the carb passage, which is then metered by the mixture screw before it enters the air stream. Open is richer.
 
Nessism said:
It's not an air screw, it's a mixture screw. An emulsion of fuel/air comes up the carb passage, which is then metered by the mixture screw before it enters the air stream. Open is richer.
Click to expand...

What an a**hole I am.
 
Hey Mike,
If that's the worst thing that happened today I'd call it a great day!
 
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