oil in airbox - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 8 Old 09-16-2017, 06:30 PM Thread Starter
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oil in airbox

2009 Vee, 90,000 km.

Due to severe sluggishness above 5000 RPM I decided to do a dirty fuel pressure test (cycling the ignition on 3 times until the ecm completed its cycle). I only got 50 ml instead of 300-350 ml. During on road testing I cranked the throttle way back (numerous times) even though there was no response hoping that the problem would go away. but it didn't.

Now I noticed that oil was dripping onto the wiring under the air box. When I took the air box cover off the filter was dry albeit dirty, in the bottom of the air box was an accumulation of oil which I cleaned up with paper towels.

My question is could the oil accumulation in the air box be caused by me cranking on the throttle even though the engine was bogging out or should I be looking for something else?

Thank you

Brian

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post #2 of 8 Old 09-16-2017, 06:32 PM
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Oil in the airbox almost always comes from the bike being on its side and oil migrating from the crankcase to the airbox through the crankcase breather tube.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #3 of 8 Old 09-16-2017, 07:14 PM Thread Starter
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Quote:
Originally Posted by greywolf View Post
Oil in the airbox almost always comes from the bike being on its side and oil migrating from the crankcase to the airbox through the crankcase breather tube.
The filter in the breather tube was wet with oil, Although I haven't seen this before. I will be taking the air box off to look further.

Thank you for the quick response.

Anyone else with a plugged fuel filter get oil in their air box?

Brian

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post #4 of 8 Old 09-16-2017, 07:20 PM
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I had oil mist, but not accumulation in my airbox when I had a clogged fuel filter. I don't think the two were related.
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post #5 of 8 Old 10-04-2017, 07:56 PM Thread Starter
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took the air box off and the oil was coming up from the tube leading to the crankcase. The it leaked around the 2 rubber horns onto the wiring below. Should have the bike fixed by the weekend and will see how it works.

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post #6 of 8 Old 10-05-2017, 10:24 AM
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I checked the air box the other day. It was dry and clean even though I'd had the bike resting on it's side a few times. Lucky to not have a pool of oil in there like before.
No collection of bugs and sticks since I put a piece of window screen on the intake.
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post #7 of 8 Old 10-09-2017, 04:40 PM Thread Starter
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finally got the external fuel filter put on. Bike runs nice. Harder on gas as I am always revving it between 4000 - 6000 rpm.

as for oil in the air filter box I will see if the problem continues, but I doubt.

Thanks all for the replies

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post #8 of 8 Old 02-08-2018, 06:23 PM Thread Starter
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I rode well over 3000 km after the fuel filter bypass, no more oil in the air box. Appears that in my case my attempts to rev the bike over 5500 rpm while in fuel starvation was causing back pressure in the crankcase pushing oil up into the air box. All is well now.
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