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View Full Version : Why do I have oil in carb and airbox?


hotlicks
02-13-2007, 01:24 PM
Just bought a 2001 400ex with a 440 kit. Guy took motor apart because he was getting motor oil coming through the carburetor and into the air filter/box. Not cup fulls , but enough for there to be a problem. My only guess is he overfilled the oil reservoir. Could there be any other cause. Just wanted to ask before I assemble the top end .

Thanks
Honda#4
02-13-2007, 01:47 PM
it's possible that could be. Maybe it has bad piston rings?
exboomer
02-13-2007, 08:57 PM
Check the oil level and if it's okay, sounds like blow-by.
hotlicks
02-14-2007, 01:35 AM
the oil has been drained and the motors top end is apart. What would cause blow by?
lpmaster
02-14-2007, 03:08 AM
improper ring gaps and/or ring seal most likely just too mmuch oil
exrider008
02-14-2007, 03:39 AM
the oil over flow goes into the engine so it could be that ur oil was too full.
http://servicehonda.com/hard%20parts/atv/trx400ex%2099-04/trx400ex%20frames%20page.htm
look at #12 that connects to the crank case.


EDIT: click link and scrool all the way down and click Air Cleaner.