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Thread: This is why YFZ's have oiling problems

  1. #1
    Join Date
    Aug 2005
    Location
    Winter Haven, Fl.
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    2,005

    ***STICKY THIS*** Can lead to motorfailure

    This is why our bikes aren't getting enough oil through them. I just had mine rebuilt and there is alil metal from breakin, but the rest is gunk. Probably from loctite. There was also a little grass on this screen. I was going to wait to check b/c normally I check it every 3-4 oil changes. But due to my motor getting rebuilt and I don't even have 4hrs on it something told me to check it... I'M GLAD I DID! Sad thing about it... ALOT of dealers steal have no clue about this screen.

    1st pic is after it was cleaned and ready to put back into the oil tank

    2nd and 3rd pics are completely disgusting...





    If it'll run... I'm ridin'!!!

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    KX85

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  2. #2
    Join Date
    Sep 2002
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    1,422
    how long has it been since you cleaned it last? if you havent ever cleaned it how old it the bike? im just tring to figure out how long we should go before we pull the tank and clean for maintenance.
    CT Racing/IMS-ROLL YFZ-450 (Red)
    Duncan Racing/IMS-ROLL YFZ-450 (Blue)

  3. #3
    Join Date
    Mar 2006
    Location
    Mass
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    74
    Wtf man I found out about that screen 9 mos after I bought my YFZ and I took it out to clean it and it wasnt enev close to thet bad.It was bad enough that I cut it right out. It was a little bit to much of a pain in th ***** to reach to clean after every oil change( I do an oil and filter change after every ride).
    If I were you I would check your engine breather lines to make sure they are still on correctly. A buddy of mine had this problem and his motor sucked in all kinds of dirt, grass, bugs...Doesnt look normal to me!!!
    Rich Joseph
    YFZ 450
    #11x
    NEATV MX
    www.spasticdesign.com

  4. #4
    Join Date
    Aug 2005
    Location
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    Like stated in my post, the bikes fresh off of a rebuild. That's where all the gunk from the loctite is from. The grass... I haven't had that problem since I got rid of my stock filter. Once I went with my K&N it solved that problem... til I checked it this time. Recently I've had a friend of mine whose bike was having motor problems due to lack of oil. I kept asking the guy at the shop to check that screen and I don't think he ever did.
    If it'll run... I'm ridin'!!!

    http://home.earthlink.net/~hotscott03/

    Sons:
    Jhamir "JAM" Scott #320
    KX85

    Sponsors:
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  5. #5
    Join Date
    Aug 2005
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    Winter Haven, Fl.
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    Originally posted by f1502nv
    how long has it been since you cleaned it last? if you havent ever cleaned it how old it the bike? im just tring to figure out how long we should go before we pull the tank and clean for maintenance.
    Read the post... This screen was clean every 3-4 oil changes. I've had my bike almost 3 yrs and the 1st time that I cleaned it was probably 7-8 months after I got it. It had grass covering the screen like the gunk you see now. I got rid of that stock filter and got a K&N and that solved that problem. I'd still have minimal aluminum and metal chips though. The bike ran for 2yrs 6 months and then I rebuilt it...
    If it'll run... I'm ridin'!!!

    http://home.earthlink.net/~hotscott03/

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    Jhamir "JAM" Scott #320
    KX85

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  6. #6
    Join Date
    May 2006
    Location
    ro fo'
    Posts
    85
    how do you locate the screen to clean it? this makes me want to check mine now haha
    -2004 YFZ450

    - Stage 2 HOT CAMS
    - HMF slip-on
    - Dynojet jet kit
    - K&N Air filter
    - Red fuel mixture screw
    - +1" Chrome Burgard steering stem
    - Billet tie-rods
    - GYT-R frame guards
    - 20x11x9 HD's on C-series Rims on rear
    - 21x10x11 Razr II's on the front
    - Dirt Digger Clutch

  7. #7
    Join Date
    Feb 2004
    Location
    Central New York
    Posts
    5,082
    christ im going on my 4 th season and never touched mine, guess i will do it before i hit up some practices this winter
    2013 Polaris Scrambler 850 xp

    2004 Kawasaki Kfx 700

  8. #8
    Join Date
    Mar 2006
    Location
    Mass
    Posts
    74
    I dont even know why its there??? I cut mine right out over a year ago and havent had a problem. The bike already has an oil filter!!!
    Rich Joseph
    YFZ 450
    #11x
    NEATV MX
    www.spasticdesign.com

  9. #9
    Join Date
    Aug 2005
    Location
    Winter Haven, Fl.
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    2,005
    Actually, I'd rather have that as extra protection and check it every couple of oil changes. If not for the screen this mess would have been cycling through my motor.
    If it'll run... I'm ridin'!!!

    http://home.earthlink.net/~hotscott03/

    Sons:
    Jhamir "JAM" Scott #320
    KX85

    Sponsors:
    Firepower Minis Motors
    Pirelli
    Artistic Apparel
    Smith Optics
    Athena
    DeCal Works
    PitPosse
    AGV Helmets
    Signs A Rama (Lakeland)
    ASV Inventions
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    O'Neal USA
    TwinAir
    OneNation Extreme
    R1R Performance
    C4 Suspension

  10. #10
    Join Date
    Oct 2003
    Location
    Elkins,WV
    Posts
    818
    The screen is to stop junk from ruining your oil pump! It's the only protection for the suction side of pump! The oil filter catches any small particles before entering the engine oil system! Do not remove the screen! clean every 40hrs of operation at minimum!
    Brent Sturdivant

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