Whats wrong with my bike??

Discussion in 'General Harley Davidson Topic' started by treeguy, Jun 6, 2010.

  1. treeguy

    treeguy New Member

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    I have a 2003 883 sportster that has oil coming out of the carb what causes that?????

    Please help
     
    Last edited by a moderator: Jun 6, 2010
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    I don't have a sportster manual but I believe that your bike vents thru the rocker box. The umbrella valves in the heat can become inoperative and need to be replaced. There will be Sporster owners who will post soon who will have some definative answers to this problem. You have come to the right place. I solved the oil spitting back thru the carb on my Evo Softail with a metel piece from kuryakan that connects the two vent holes and I added a length of 3/8" hose and dropped it down under the frame and added a filter to the end. Welcome to HDTalking.
     
  3. Jack Klarich

    Jack Klarich Expert Member

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    Don has you covered here, one question did you over fill the oil?
     
  4. treeguy

    treeguy New Member

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    Thanks guys, Jack I did overfill the oil.
     
  5. glider

    glider Veteran Member

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    treeguy

    There's no need to bump your post up after only 3 minutes :D
     
  6. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    The evo sportster of that age has the head crankcase breather system
    oil mist in the air being forced out through the breather banjo bolts into the air cleaner may condense back into oil when it hits the cold air in the air cleaner
    the umbrella valves in the lower rocker cover allow excess pressure from the breather system to vent into the rocker cover but prevent oil from returning back down from the rocker area
    however after some time the umbrella valves become perished and require replacing
    if your piston rings are worn some cylinder pressure can bypass the piston rings and pressurise the crankcase and forcing any oil in the sump up and out the breathers
    I hope this gives you a few potential answers

    Brian
     
  7. Jack Klarich

    Jack Klarich Expert Member

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    A very wise man(Glider) has pointed out that even tho the manual states specific a mounts of oil per oil change always remember the oil that remains in the crank case and oil galleries and figure a lesser amount when changing oil, try 1/4 to 1/2 less quarts ride til hot and recheck:s
     
  8. glider

    glider Veteran Member

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    2 Points for Capital Jack :lolrolling
     
  9. Jack Klarich

    Jack Klarich Expert Member

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    Thanks boss its good to be back to my puter again:D
     
  10. stefdustin

    stefdustin Member

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    My son has learned when he changes oil in his 1998-1200 Sportster to leave it 1 pint low. After it is warmed up and rode some it will check real close to the full mark.