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K&N air filter question

  • Thread starter Thread starter suegip
  • Start date Start date
Have a look at the K&N site or give their 1-800 number a call. They would mention if any carb changes are required. For a stock set up I would doubt it.

One thing to note, however, is that K&N filters are less restrictive than stock so there could be a bit of leaness develop but not likely unless you also have a less restrictive muffler fitted which you don't. Again I doubt that it would be enough to cause performance issues or even to worry about.

Give it a whirl.

Cheers,
Spyug.
 
You probably will have to make adjustments to the idle mixture screws. See if you can get a hold of a Colortune.
Maybe even step up on the mains. Not much though. I would do plug chops and read spark plugs.
Remember they do flow more air and these bikes are tuned lean from the factory.
 
I put a drop in replacement on my 650. I did not re-jet, or really make any adjustments, except one.

I noticed that after running at steady throttle for a period of time (think rally cruising) It would seem like it was starving. At first I was thinking some rust chips in the float bowls, that would jam up a passage, then with more bumps/changes in throttle it would go away.

Anyway, all this time I had to keep the vent tubes on because the choke didn't work (PO), and I had to blow into them in order to manually choke the bike to get it started. Well, wouldnt you know it, one time the vent tube came off and I rode with it off, and no stumbling anymore.

Long story short, got re-build kits and re-built my 550 carbs with 650 jetting, and put it on so that the choke would work. Did not install the vent tubes and sure enough, runs like a champ.

All that to say, with the K&N on my 650 the vent tubes being attached were too restrictive, and causing starvation at steady cruising speeds, without the tubes attached, and just venting through the T to atmosphere it runs great.

That has been my experience. YMMV.

Amos
 
I popped one right in on my '85 700ES 20 years ago without making any changes at all.....................still running like a champ, about to hit 100K miles with it.
 
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