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Thread: Hyosung GT650 Comet. Oil in the airbox?

  1. #16
    Join Date
    9th April 2012 - 07:00
    Bike
    2008 Hyosung GT250R
    Location
    wellington
    Posts
    32
    Quote Originally Posted by Monkeynz View Post
    I wonder if there is some sort of system I could attach to the crankcase breather that would still allow the crankcase to breath but let the oil drain back into it?
    i asume your being funny, but incase your not, build an oil catch can. you can either have it drain back into the crankcase or vent into the atmosphere, or both.
    to be honest, i'd rip the air injectors out, chuck in an oil catch can vented out into the atmosphere and drain it after each race/meet.
    keep in mind i first sat on a bike last friday, but bike engines work like cage engines, air/fuel/compression. any cage engine pumping oil into the intake usually means to much crankcase pressure. throwing in a good oil catch can prove to be a good band aid that works well.

    heres why i think a oil catch can is all you need.
    under normal load and revs, the compression ring blow by is able to be countered by crankcase breathers and baffles.
    ramp up the load and revs and you are increasing the compression ring blow by and the occurance of the blow by. so now the crankcase breathers and baffles cant handle venting it all at the designed pressure, causing oil mist to be sent out the breathers and filling the baffles.
    basically, you have too much crankcase pressure, you need to filter it and vent it more efficiently i.e oil catch can

  2. #17
    Join Date
    13th November 2009 - 19:37
    Bike
    FXR150, ZXR400, Hyosung GT650 Comet
    Location
    Christchurch
    Posts
    207
    I have finally solved the problem. The engine has had work done on it before I bought it and they didn't connect the breather pipes to the correct outlets/inlets on the airbox. It took a lot of research on the internet to work it out. But finally found some pictures that showed me where the pipes are meant to go, no wonder I was having problems with oil filling the airbox.
    While I was at it I removed the AIS system which I also found out about while I was doing my research.
    And I have ordered a jetting kit.
    I love my Bucket.

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