Question about 2004 Honda CRF 450 R

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Spewing oil out of the air filter when running

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That is usually a sign of "blowby, due to excessive wear either piston rings, or valve issues. Get a compression test done.

Posted on Sep 01, 2010

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Posted on Jan 02, 2017

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Troy-bilt cultivator 26cc gas/oil separate engine spewing oil out through filter when running...there is a hose from the oil reservoir straight into the back of the filter...as the engine revs it literally...


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Check you oil tank and see if it's nearly empty. If so, you have sheared the key in your oil pump and it's not pumping the oil out of the engine. Your '94 model is what we call a "head breather" in that your crankcase vents are up in the top of the head. If you've got enough oil to "spew" into the air filter, you've got a major problem with the top of the heads filling up with oil. The only way that can happen is they are allowing the oil to drain back down. Unless someone has been working on the engine and done something wrong, it would be because the bottom end is full of oil. For this to happen, a small key that drives the scavenger gears in your oil pump has sheared and it's not pumping the oil out of the engine or you've got an oil filter designed for a Twin Cam on your Evo engine.

Your '94 also has a plastic timing gear in it. I've seen too many of them break a tooth off the gear, the tooth gets caught in the scavenger gears and shears the key. If it's the wrong filter, the mess in the filter is too fine for the Evo style oil pump to push the oil through and it backs up in the engine. Check your oil in the tank to see if it's all in the crankcase.

Good Luck
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Way too much oil, how do I fix?


If the problem was just overfill, the smoke should clear up after running it for awhile. You may want to replace air filter or clean if possible.

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hi your machine will discharge oil from the vent if your rings or bores are worn ,if the oil comes out with the air the your valves are broken or not sealing
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ian

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