Dropped a K&N filter into my ride yesterday, now it is popping between shifts and when I wind it up and close the throttle hard it shoots flames...can't be good (but it does look cool).
Was running great B4 the new air filter (still does) but I'm confused... Don't flames indicate too rich? I thought it would go leaner with the new airfilter.
I'm running at a mile high, 1/2 spacer, stock jets, open pipe and 2 1/2 turns out on the air mix screw.
I was actually getting ready to go up one on the main but now I'm not so sure...
I'm wondering if dropping 60 bucks on the K&N was a good idea.
Any ideas would be welcome
Thanks,

Thanks Routy but hat was the only thing that changed between Sunday and yesterday...I'm pretty darn sure I didn't have flames shooting out the back on Sunday and the temp/altitude and gas all were constant.
But like I said, wouldn't the higher air flow lean it out rather then richen it?

you're running lean. the K&N flows much more air than any paper element.  Theresa reason thay advertise it out flows a paper filter and makes more power (when jetted accordingly). Same with free floing exhaust.

I have a few days of rain/crummy weather here. I'm going to try and drop in the next size main I received from Lancer's kit and see if that helps, I'f it still flames out I'll try the pilot w/ bleed holes. If that doesn't help then maybe I'll try the enrichment valve mod.
If all else fails, I'll go backwards in steps and eventually end up with a stock bike again...haha

Charon wrote on 04/21/10 at 09:35:09:


Its the closest thing to an oil bath air cleaner without getting one. Ever wonder why oiling an air clearn element came about?? Dry guaze and paper filters olny get so much. To fix this, the use of a pre filter was adopted. Helped , but still needed improvement. Then someone decided to oil the foam on the prefilter. Hmmm, works well, but still restricted air flow. Ditched the paper and desined a pleated filter that will trap oil and allow the most airflow without losing the oil into the motor.

They only make a mess when you over oil them or squish them in the filter box. Cleaning is very easy, drop it in a bucket of hot soapy watr and shake it around, let it air dry or take the compressor to it. You could hit it with a preassure washer, you can hit it with carb cleaner. You can clean it in the solvent tank. Dishwashers work great. Re oiling isn't that difficult as long as you read the dirctions and 'spin' it after a few minutes to let it run. By spin I mean shaking the excess out, if any. All my K&N filters are round, so thats why I spin mine. I have had it on the dyno with and without K&N filters and they work, period.

I've run a K&N for the last 12 months or so with no issues. Also a mile high, 2008 S40, no engine mods. It is popping a little more this week than last but not dramatically so. I think the change in temp (cooler) and possibly humidity may be contributing to the issue.

I'm in Lakewood. My exhaust is stock. It is my first bike so when I purchased it I got the extended warranty and have been reserved in making any mods that may void the warranty. One year left, thinking about foregoing the last year. Good luck!

SmilinLDR wrote on 04/22/10 at 18:52:51:

Warrantys are void only on the parts you change. Went through this on my Dads Triumph when we chaged the exhaust and the shifter seal started leaking....everything was still under warrabty, except the exhaust pipes/emmissions system....