It's all in the air filter!
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Thread: It's all in the air filter!

  1. #1
    Senior Member kj7687's Avatar
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    Lightbulb It's all in the air filter!

    Oh my. I've never had a bike that seemed to be affected to such extremes by the purity or dirtiness of the air filter. My 2015 Yamaha XT 250 is like two completely different bikes. When the filter gets dirty (which it does very easily, being a small paper filter), the XT feels like it's pushing about 19 horsepower. Knock all the dirt and foxtails out, and vaccum the filter clean enough to eat off of, and it jumps right back up to about 23 horsepower. When it's dirty, the bike barely wants to do lame ass wheelies in first gear. Just after cleaning it, the bike will again do pretty snappy second gear power wheelies, with quick pickup and good duration. Finally, when it's dirty, it'll barely hold 55 mph up a section of road near my house, and it won't hold fifth gear at all on the steeper parts of the mountain pass roads around here; when it's nice and clean, however, it has no problem holding 60 or 65 mph up that same section of road, and no problem holding any speed between 35 and 50 mph (or a bit more if I want to) in top gear, on the steepest parts of the mountain-pass roads. That's how much of a difference some dirt in the air filter makes - amazing!
    Last edited by kj7687; 07-28-2016 at 05:53 PM.
    KJ, just KJ, ok.


    Current rides:
    2004 GMC Sierra 1500, 1999 Toyota 4Runner

    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

  2. #2
    Senior Member Xracer's Avatar
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    It's your bikes way of saying. Take care of me and B.T.W. when did you last change my oil?
    Smitty Blackstone likes this.

  3. #3
    Senior Member Smitty Blackstone's Avatar
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    60 or 65 mph?

    On an off road bike?

    Now you are just showing off!
    Lol!

    Al
    From the land of QA50s, CT70s, CT90s, and a TW......
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    Senior Member silverwing's Avatar
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    KJ is telling the truth about the xt250, it definitely has more power than the TW. I had mine in the big horn mountains of WY and I was pretty impressed with its power output.
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  6. #5
    Senior Member Fred's Avatar
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    Might be wise to carry a spare clean A/F for those long dusty rides.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  7. #6
    Senior Member kj7687's Avatar
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    I've started cleaning the thing every 500 miles. It gets pretty dirty even after just one or two longer off-road forays, though. But I figure, rather than clean the damn thing every hundred miles, I'll live with a little weakness in between, haha.


    Fred: I will probably do that if/when I go on more of an adventure ride - along with my spare battery, spark plug, etc.
    Last edited by kj7687; 07-28-2016 at 05:53 PM.
    Smitty Blackstone likes this.
    KJ, just KJ, ok.


    Current rides:
    2004 GMC Sierra 1500, 1999 Toyota 4Runner

    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

  8. #7
    Senior Member Adam-n-nevada's Avatar
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    Quote Originally Posted by kj7687 View Post
    I've started cleaning the thing every 500 miles. It gets pretty dirty even after just one or two longer off-road forays, though. But I figure, rather than clean the damn thing every hundred miles, I'll live with a little weakness in between, haha.


    Fred: I will probably do that if/when I go on more of an adventure ride - along with my spare battery, spark plug, etc.
    Spare Battery?

  9. #8
    Senior Member kj7687's Avatar
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    Quote Originally Posted by Adam-n-nevada View Post
    Spare Battery?

    LFX14L2-BS12 - Shorai Lithium Batteries
    Smitty Blackstone likes this.
    KJ, just KJ, ok.


    Current rides:
    2004 GMC Sierra 1500, 1999 Toyota 4Runner

    Past rides: 2015 Yamaha XT 250, 1997 Suzuki DR 200, 2007 Honda Ruckus, 2007 Yamaha TW 200, 2007 Kawasaki Ninja 500, 2009 Kawasaki KLX331S; 1994 GMC Sierra 1500, 1987 Nissan Pathfinder, 1992 Acura Integra, 1986 Honda CRX, 1989 Jeep Cherokee, 1994 Chevrolet Astro Van, 1979 Volkswagen Rabbit, 1984 Jeep Cherokee

  10. #9
    Senior Member Xracer's Avatar
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    Sealed,leak proof batteries are a good thing. In fact it's one of the first thing I changed on both the Dub and Triple-B.
    Smitty Blackstone likes this.

  11. #10
    Senior Member jbfla's Avatar
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    Quote Originally Posted by kj7687 View Post
    I've started cleaning the thing every 500 miles. It gets pretty dirty even after just one or two longer off-road forays, though. But I figure, rather than clean the damn thing every hundred miles, ......
    That's one thing I don't understand about the XT250....the paper air filter.

    All the other dual sport bikes I've seen have oiled foam filters.

    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

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