Question about 2005 Honda CRF 450 R

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CRF 450 Honda leaking oil through carburetor

My CRF450 Honda is leaking engine oil through the carburetor, and through the little hole on the right side of the cylinder.

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  • dmotoman1 Mar 07, 2009

    I have a very nice trick 07 crf 450 x all white including seat all MDK graphicsblack wheels ect never once have i been able to kick start this thing i have the screw air cleaner and air box mod and JD jetting i heard the 450 R carb is the ticket any body no where i can pick up one for a good price. Thanks email me a dmotoman1@yahoo.com Thank's again

  • chris madison
    chris madison May 11, 2010

    its a wet sump, i have 2 of crf 450s and this bafels me

  • maro80350 May 11, 2010

    oil?? is it a oil gas mixture thats leaking? and i forget is it a dry sump(remote oil tank) or wet sump?

  • Anonymous Mar 22, 2014

    After I replaced the gasket on the right crankcase cover of my 1976 Honda cb360t, oil started leaking from the cover about half way up on the front side of the cover. I didn't use any gasket dealer and the housing s were very clean . Should I clean everything and use gasket dealer? Thank you very much.

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It sounds like your valve/rocker cover to spark plug tube seal is folded over or something. My reason for saying this is, because the only place for oil to get into the plug tube is a bad seal to the cover or the spark plug isn't tight? and that hole is for expelling liquid so it doesn't cook the plug into the head

Posted on Feb 19, 2009

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Read your owners manual. the crank case breather tube has a plug on the end of it and needs to be drained periodically.if this is not done over time the tube fills with oil and then dumps into the intake tract.

Posted on Jul 20, 2010

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I would change the pistions rings.

Posted on Dec 21, 2008

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robotek
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SOURCE: CRF 450 IS LEAKING OIL TROUGH CARBURETOR

Hi there

You should not have oil leaking from the carby. If you have over filled it with oil, then it may be coming from the crankcase breather and then into the airbox, and appearing to come from the carby. If you have not over filled it, then the bike may have blowby problems with compression gasses passing the rings, and in a similar manner forcing oil out the crankcase breather. Not sure about the hole in the side of the cylinder... do you have a picture? Unless its pouring out, or gets worse, I would not be too worried. If you have over filled the oil, maybe time for an oil change to get the level right.

regards
robotek

Posted on Dec 06, 2008

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Aug 03, 2010 | 2005 Honda CRF 450 R

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Bigger jetting (a higher fuel/air ratio) will not cause overheating. But an air leak between the engine and carburetor can cause overheating - and an erratic idle. Make sure the carb is correctly connected and there are no air leaks. An air leak could also be the cause of the popping that you were attempting to address by re-jetting.
Once any air leaks are corrected, adjust the idle mixture screw to attain the highest idle speed when the engine is at normal operating temperature. Then, use the idle speed screw to set the correct idle speed.
Finally, ride the bike at full throttle for a short time, pull the clutch and coast to a stop. Remove the spark plug and check the color; a tan or light brown color indicates correct jetting. Too light = too lean. Too dark = too rich.

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Jul 27, 2009 | 2004 Honda CRF 450 R

1 Answer

CRF 450 IS LEAKING OIL TROUGH CARBURETOR


Hi there

You should not have oil leaking from the carby. If you have over filled it with oil, then it may be coming from the crankcase breather and then into the airbox, and appearing to come from the carby. If you have not over filled it, then the bike may have blowby problems with compression gasses passing the rings, and in a similar manner forcing oil out the crankcase breather. Not sure about the hole in the side of the cylinder... do you have a picture? Unless its pouring out, or gets worse, I would not be too worried. If you have over filled the oil, maybe time for an oil change to get the level right.

regards
robotek

Dec 06, 2008 | 2005 Honda CRF 450 R

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