Question about 2004 Honda CRF 450 R

1 Answer

Spewing oil out of the air filter when running

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Honda Master
  • 2,050 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a john deere sx85 (13 hp). Big plume of blue smoke and oil coming out of big air filter opening. Drained excess oil - had fluid in spark plug- pushed out the excess fluid.

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

Apr 10, 2017 | John Deere Garden

1 Answer

Stihl br 400 problem- spewing oil out the back of motor

I would say it is not an issue with the piston and rings, any oil leaking from the muffler has to be unburnt oil from the fuel/oil mix, if not already you should run it at a 50-1 mix, also make sure the engine is not running too rich on the fuel screws, check the condition of the air filter as a blocked filter will richen the mixture.

Jan 11, 2013 | Stihl BR400 Backpack Leaf Blower

1 Answer

Generator spewing oil

if too much oil it will do this , the oil is pushed past the piston rings , fill to correct level , if it does it with correct oil level the piston rings are gone,

Feb 29, 2012 | Hammering

1 Answer

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 the engine revs it literally...

Hi, Check the oil reservoir breather that it's not plugged up. The oil should be returning back to the reservoir not going to the filter. That tells me that there is air being pumped into the engine (oil).
The piston rings could be broken or the carberator needs to be readjusted.

Open the air screw abit more on carb. Then see what happens. Good luck.

Jul 30, 2011 | Troy Bilt Tiller/Edger 26cc, Model No....

1 Answer

94 evo motot suddenly spewing oil into air filter form breather

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

Feb 28, 2011 | Harley Davidson FXR Super Glide...

2 Answers

My Craftsman 15 HP Lawn tractor is spewing white smoke. When I removed the air filter, I noticed there was oil all over the inside of the air filter and at the bottom of the air filter. When I run the...

I could be caused by a couple things, the most common is overfilling with oil, running on too great of angle and flooding the valve stem area or really bad valve stem seals.

Jun 01, 2010 | Craftsman 20 Hp 42" Deck Lawn Tractor

2 Answers

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.

Aug 05, 2009 | 2004 Yamaha TW 200

1 Answer

Compressor spewing Oil

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
hope this helps

Mar 22, 2009 | Coleman 6.5hp - 80 Gallon Vertical ASME...

Not finding what you are looking for?
2004 Honda CRF 450 R Logo

Related Topics:

70 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4521 Answers


Level 3 Expert

76109 Answers


Level 3 Expert

4340 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides