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Thread: two stroke spitting oil swing arm

  1. #1
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    Default two stroke spitting oil swing arm

    my bike is spitting oil on my swing arm, anyone deal with this? running 50.1 full syn, leaned the pilot by 3. any suggestions?

  2. #2
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    Quote Originally Posted by suicidalgecko View Post
    my bike is spitting oil on my swing arm, anyone deal with this? running 50.1 full syn, leaned the pilot by 3. any suggestions?
    i could guess ,the crankseals are blown out .
    then it spits oil due to pressure from the crankcase ,
    that slips pass the seals .
    '91 '94 '01 KX500

  3. #3
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    Is it the same color as the premix? It could be from the shock or trans too?

  4. #4
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    is it oil from your silencer running back down and coming out of the joint where the header and silencer connect? do you have a clamp on that joint?
    current bikes: 05 KLX110 plated big bore dual sport; 05 KTM 950 Adventure

    past bikes: 06 CRF450X tard/DS; 05 CR500AF plated SUMO/DS; 06 Berg FS650C; 01 XR650R

  5. #5
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    Quote Originally Posted by restukey View Post
    Is it the same color as the premix? It could be from the shock or trans too?

    you ride 2 stroke bikes ?

    if you do you must know that the premix is burned in the process of
    the combustion and that it lubricates the piston /crank/bearings.

    conclusion..no matter what color the mix had,you,ll never see it got spitten out by the engine..

    but what you will see if a 2smoker spits oil...is gearbox oil .
    and this comes due to the fact that the crankseals had been blown out.
    this happens if the seals are old and hardened ,or unproper warm-up.

    how come ?
    the pressure in the crankcase blows the seals out and then ,
    by every stroke pressure slips through the damaged seal.

    this pressure pushes the gearbox-oil right through the overflow-hole
    located on top of the gearbox case.

    been there done that
    '91 '94 '01 KX500

  6. #6
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    could be counter shaft sprocket seal
    2005 RM 65 pitbike (for sale, PM if interested)
    2005 KTM 4FIDDY SMR Streeted
    2004 Sv650s (Sold)
    2007 GSX-R 750 (My new rocket ship)

  7. #7
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    Quote Originally Posted by kx500freak View Post
    you ride 2 stroke bikes ? ... .. .

    this pressure pushes the gearbox-oil right through the overflow-hole
    located on top of the gearbox case.
    You left the second part out of your first post. I tracked a TZ250 for awhile. Burned or unburned the premix has a different look to it than trans oil. I lost a step in your first post, that's all.

  8. #8
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    it's black oil, and comes from the end of the silencer, and at the bottom of the silencer can, finding it's way to my swingarm, wheel and rear brake. it doesn't leak at the join to my pipe, got a firm connection there. should i check the gear oil levels to determine if crank seals leak? it spits maybe half ounce for 10+ miles.

  9. #9
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    I think that may be a little excessive, but still pretty normal. What's your premix ratio? Sounds like a little too much engine oil is getting past the combustion event and out the pipe. Depending upon your premix ratio, you may be able to use less oil and have less mess.

    *EDIT* Nevermind... I just saw your first post; 50:1. That's pretty lean already. I might: (1) just try to find another exhaust system that won't aim the drips at the swingarm, (2) somehow re-route the current system, or (3) deal with the mess.
    "Our math shows that The Bird is equal to or greater than The Word."


  10. #10
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    Default hmm

    even if ithe joint is tight where the pipe silencer meet..... if the fiberglass wad is saturated (obvious since you leaned the jet) then it will leak at the edge of the silencer where the can and inlet cap slide together..... re pack that bad boy, and if it still does it, then yeah, you got a seal issue..... 50 to 1 is hardly an excessive oil mixture... i run 32:1 and it does it to me......
    if you ride it on the pipe more often, it wont do it as bad....... at least thats my problem anyways
    Steer with the throttle , eh?

  11. #11
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    How does the plug look?

    Try leaning out the main out some.

    .
    www.MotoHose.com
    Don't bring a gun to a snowball fight!

  12. #12
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    Quote Originally Posted by apa View Post
    How does the plug look?

    Try leaning out the main out some.

    .

    Agreed. Check jetting. Most 2-strokes will spooge a little but that does sound excessive. It's not fowling plugs?

  13. #13
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    plug looks good, took the main down by one and in process of repacking the silencer. i'll give ya'll a report of the progress. thanks for all the suggestions guys

  14. #14
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    Repack the silencer its as easy as that. My 125 does that when it needs to be repacked. I run 40:1 motal premix. Plus repacking the silencer will quiet the bike down and give you more power. P.S. break cleaner is the easiest way to get the oil off the swing arm.
    Sumo: 08 Husky SMR 450
    Mx: 08' CRF 250
    2001 R6: Wont be missed with the replace of the SM

  15. #15
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    WD40 will break down the spooge.

    My YZ does not blow out a drop of oil or even show signs of oil as it is jetted properly with race gas and 50:1 Golden Spectro for MX and 32:1 for SM.

    .
    www.MotoHose.com
    Don't bring a gun to a snowball fight!

  16. #16
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    problem solved.

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