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June 16th, 2013, 04:18 PM   #1
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570 has oil in air box??

Doing an air filter change right now I've noticed a small amount of oil sitting in the air box - probably about 5ml. There was a little bit of something in there last time but the bike sat for a while between rides and I thought it may have been a little air filter oil/grease leaking down.

But the strange thing is I use no toil products which is a green colour.

Could this be engine oil? If so what would cause this?

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June 16th, 2013, 05:37 PM   #2
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Re: 570 has oil in air box??

Engine breather vents into the airbox.
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June 16th, 2013, 07:37 PM   #3
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Re: 570 has oil in air box??

I have had it a few times, engine oil comes back up the engine breather pipe.
It happens mainly when you have had the bike upside down or in longer extra steep decents.

Steve
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June 16th, 2013, 08:25 PM   #4
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Re: 570 has oil in air box??

Originally Posted by tazer
I have had it a few times, engine oil comes back up the engine breather pipe.
It happens mainly when you have had the bike upside down or in longer extra steep decents.

Steve
Hey Steve had both yesterday! That might explain it. Lots of hill, on its side a few times.

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June 23rd, 2013, 11:50 AM   #5
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Re: 570 has oil in air box??

Extended high rpm's will also push the hot oil mist into airbox and you get a nice puddle in there every 10h.

I made a blind plug with lathe, plugged the airbox hole where vent hose goes, and installed bmc breather filter on the end of hose = no more oil into airbox, but I can smell sweet 300v fumes coming out of breather filter when riding very hard. Still no sign of oil getting through the filter, so might not need a catch can at all!
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June 26th, 2013, 03:56 AM   #6
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Re: 570 has oil in air box??

If I fill over 2/3 on the oil sight glass, I tend to find oil in the airbox.
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June 26th, 2013, 07:03 AM   #7
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Re: 570 has oil in air box??

+1 on the oil overfill=oil in airbox. I have the round sight glass, and if I go much over 1/2, I'll find oil in airbox.
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November 21st, 2013, 02:36 PM   #8
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Re: 570 has oil in air box??

Apologies for the late "me too" here but it's the third time I clean my FS 570's air box, third time I see a fair quantity of oil + gas (I guess) in the bottom of it.

I saw in other forums (non Husa-related) that EFI bikes create stronger vacuums than carb, and having the valve breather hose into the air box will pull oil out through it instead of being there just for the excess oil or upside-down situations.

I'm about to buy a DNA air filter which is EUR100 and would hate to see it ruined by oil coming back.

The bike doesn't smoke and I don't see anything wrong with it. It probably *is* the breather rose, isn't it?

-Klaus
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March 6th, 2020, 03:29 AM   #9
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570 has oil in air box??

Just wanted to say thank you for this post. I was starting panic then just got flat out confused after I saw mine leaking and now I realize it's probably not that big of a deal. It's my first dirtbike and only just started riding in October (long story) so it's been on its side... Alot.

Now i just need to source a new seat.
Thanks from Alan
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