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K&N YA-2509 4.3 out of 5 stars 3 Customer Reviews
Replacement Filters > Replacement Air Filter

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K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for virtually every vehicle on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty™ and will be THE LAST AIR FILTER YOUR VEHICLE WILL EVER NEED. [MORE]
Available Information
YA-2509 Cross Reference
Product Flyer - Product Press Release
News Story - 2009-2013 Yamaha XT250 Improves Overall Performance with K&N Air Filter
YA-2509 Vehicle Applications

Part YA-2509 Product Specifications
Product Style: Unique Air Filters
Air Filter Shape: Panel
Filter Material: Cotton Gauze
Flanges: None
Height: 1.063 in (27 mm)
Package Contents: 1 Air Filter
Package Quantity: 1
Filter Re-Oiling Amount: 0.12 oz (4 ml)
Length: 5.188 in (132 mm)
Width: 2.688 in (68 mm)
Weight: 0.39 lb (0.18 kg)
Product Box Length: 7.72 in (196 mm)
Product Box Width: 1.75 in (44 mm)
Product Box Height: 9.69 in (246 mm)

99-5050 - Filter Care Service Kit - Squeeze

Product Reviews      Review part YA-2509

 Out of the box I noticed the filter did not fit the airbox well. Too the point I thought it was maybe the wrong part number. It's been awhile so I'm going off of memory but I think the cover did not fit well once the filter was installed. Went for a test ride and anything over 55mph the bike just fell on its face. A testament to the increased air flow I suppose so I will have to try to jet up. Not sure how easy it will be to get main jets for a Teikie carb? According to the literature no fuel modifications are necessary! Not sure how this could be true as these bikes run so lean due to EPA anyway. All my vehicles have K&N filters in them and I love the product but this one has been disappointing. My filter sits on a shelf in the garage until I locate jets and have the time to tune.
Monte Stage, Hibbing, Minnesota
 This filter fits my XT250 perfectly with no mods or jetting. It's probably my imagination, but it seems to breathe easier with better throttle response. I'm considering another one as an onboard spare.
Bill, California
 I have been waiting for this filter to be released (YA-2509). I have been buying K&N filters for years. Knowing the reputation K&N filters have, I knew this would be great for my motorcycle. Nice improvement on power and fuel mileage. Thank you K&N for all the wonderful great products you provide us with.
Paul H Grewe Jr., Maryland

K&N YA-2509 fits the following:
2014 YAMAHA XT250 250 - All
2013 YAMAHA XT250 250 - All
2012 YAMAHA XT250 250 - All
2011 YAMAHA XT250 250 - All
2010 YAMAHA XT250 250 - All
2009 YAMAHA XT250 250 - All
2008 YAMAHA XT250X 250 - All
2008 YAMAHA XT250 250 - All