SuzukiSavage.com - Oil in air cleaner assembly

Ollie_D

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Oil in air cleaner assembly
04/06/19 at 12:38:09

Just going through a routine check and replacement of filters and I noticed there's oil near the air filter in the intake. What could be causing this oil blowback?

My bike: So last August I purchased my first street bike, a 2006 S40, about 11000 miles (now has 12000). It's my everyday commuter (except when it sat for 3 months over winter). No mods, to my knowledge, on the bike. It's run pretty well since I've had it, with no issues.

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batman

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Re: Oil in air cleaner assembly
Reply #1 - 04/06/19 at 16:19:03

The breather tube on the top of the motor to the air box carries oil fumes etc. every time the piston moves down. Your air box has a drain tube under the bike ,It should be checked/drained at each oil change( you may be overdue ). be sure to replace the drain plug or raw (unfiltered) air can be pulled in when the piston is moving down due to the drain being between the air filter and the carb.

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Fast 650 Senior Member Offline SuzukiSavage.com Rocks! Posts: 392 Valrico, FL Gender:	Re: Oil in air cleaner assembly Reply #2 - 04/06/19 at 16:20:04 The crankcase vent tube goes into the airbox and it will blow some oil mist into the air box. A little oil mist in the air box is perfectly normal, there is a drain tube on the bottom of the box for just that purpose. If you are getting a lot of oil in there, then you need to start checking for what caused it.
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Ollie_D YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 8 Pacific NorthWest Gender:	Re: Oil in air cleaner assembly Reply #3 - 04/07/19 at 08:23:11 Fast 650 wrote on 04/06/19 at 16:20:04: If you are getting a lot of oil in there, then you need to start checking for what caused it. There's probably a few mm oil layer sitting at the bottom of the air cleaner assembly. Would this be regarded as a lot? What sort of issues would cause this?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Oil in air cleaner assembly Reply #4 - 04/07/19 at 08:27:38 What speed and how many miles is that commute?
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Ollie_D YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 8 Pacific NorthWest Gender:	Re: Oil in air cleaner assembly Reply #5 - 04/07/19 at 09:16:30 justin_o_guy2 wrote on 04/07/19 at 08:27:38: What speed and how many miles is that commute? No more than 15 miles a day, and would seldom get above 50-55
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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28373 Tucson Az Gender:	Re: Oil in air cleaner assembly Reply #6 - 04/07/19 at 09:39:06 Under 60mph shouldn't give much blow-by.... Is you oil level too high?...
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justin_o_guy2

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Re: Oil in air cleaner assembly
Reply #7 - 04/07/19 at 10:45:30

If someone has changed the routing of that hose, maybe that's what is going on.
I'd wipe it up, drain the puke tube underneath, and see how it acts.
Unless someone has had the head cover off and removed the wadded up scrubby oil vapor grabber. Or messed with the tube routing. Needs to be headed uphill for a bit as it leaves the engine, so oil mist can condense and drip back to the motor.
As long as you're not running it to crazy rpm before you change gears, your commute speed shouldn't be slinging oil out.

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batman

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Re: Oil in air cleaner assembly
Reply #8 - 04/07/19 at 11:48:42

The hose does enter the air box between the filter (back side) and the carb, you may be looking at a slight accumulation of condensed oil fumes, I wouldn't be worried . If the filter is oil soaked , you need to heed JOG's advise of checking the breather hose (it should arch above the motor) and if the filter screen is in place inside the head cover.

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justin_o_guy2

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Re: Oil in air cleaner assembly
Reply #9 - 04/07/19 at 12:02:19

Check tube routing.
If it's Not as should be
That's probably the problem.
Clean up the air box
Drain the puke tube
Keep an eye on it.
You have quite a few miles on it
It's not broken
It's not in danger
You'll be going into the clutch cover in a few thousand miles.
It's got twelve now.
Nobody knows when it started.
Or if the puke tube has ever been drained.
I wouldn't freak out about it.
Just monitor it.
After you are sure about the tube routing.

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