Burbling on decel - K&N?

[Guest]

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]

As long as it's not popping I wouldn't worry about it.

[UncleMike]

As long as it's not popping I wouldn't worry about it.

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]

Stock pipes hmmm
Are you running with the stock pilot jet?

[UncleMike]

Stock pipes hmmm
Are you running with the stock pilot jet?

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.

[Nessism]

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.

[UncleMike]

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.

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

[Nessism]

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

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.

[UncleMike]

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.

What an a**hole I am.

[chef1366]

What an a**hole I am.

You are the master of words my friend.
With that K&N I bet you should be out 2-2.5 turns out.

[UncleMike]

You are the master of words my friend.
With that K&N I bet you should be out 2-2.5 turns out.

Thanks guys.

Seriously, what an ass.

[Nessism]

Hey Mike,
If that's the worst thing that happened today I'd call it a great day!

[UncleMike]

Hey Mike,
If that's the worst thing that happened today I'd call it a great day!

Good point.

I even called a friend for confirmation on this one!