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Where is this oil coming from and should I start to worry?

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Mungel
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Joined: 21 Apr 2005
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PostPosted: 15:20 - 21 May 2011    Post subject: Where is this oil coming from and should I start to worry? Reply with quote
Shocked

I noticed it because a streak of oil came down from the carbs onto the frame.
Bike is 2000 zx9r
Thanks for advice..
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Mungel
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MaybeGuy
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Joined: 12 Mar 2007
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PostPosted: 15:26 - 21 May 2011    Post subject: Reply with quote
overfilled oil from recent oil change

or your piston rings are nackered, causing crank case pressure.

kthx
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 15:36 - 21 May 2011    Post subject: Reply with quote
The bike is due an oil change now, last changed 3.5k ago....
So not overfilled oil...

What other symptoms would knackered rings display, if any?
Would a compression test highlight the problem?
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0l0dom0l0
World Chat Champion



Joined: 21 Oct 2009
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PostPosted: 16:00 - 21 May 2011    Post subject: Reply with quote
Legnum Boy wrote:
What other symptoms would knackered rings display, if any?
Would a compression test highlight the problem?


Yes a compression test would indicate rings.

Does it smoke at all? If after a long run you give it a good rev (to redline) do you see any BLUE smoke? Not black.

If you see blue smoke it means oil is getting into the combustion chamber and I would suspect the rings are gone.
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tatters
Exxon Valdez



Joined: 05 Jan 2004
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PostPosted: 16:10 - 21 May 2011    Post subject: Reply with quote
How much oil was there in the airbox?

The crankcase breather vents into the airbox on most bikes and can casue some oil to be vented out under normal condtions on some bikes but it normally not more than a few table spoons worth.
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 16:24 - 21 May 2011    Post subject: Reply with quote
0l0dom0l0 wrote:
Does it smoke at all? If after a long run you give it a good rev (to redline) do you see any BLUE smoke? Not black.

If you see blue smoke it means oil is getting into the combustion chamber and I would suspect the rings are gone.


Can't say I've ever noticed. I'll take it for a ride in a minute and try this out..

tatters wrote:
How much oil was there in the airbox?

The crankcase breather vents into the airbox on most bikes and can casue some oil to be vented out under normal condtions on some bikes but it normally not more than a few table spoons worth.

Theres not much at all in the airbox, just a thin residue. Certainly not even a teaspoon. My crankcase does vent to the airbox, and there is an oil catch tube on the bottom of the airbox. This doesn't contain much either.

If it is the rings, would it be pressurising the crankcase and forcing excessive oil up the breather?

And the obvious question.. If it is the rings, would I be able to change them myself (moderate spanner skills) or is it too technical a job to be attempted in my little under-equiped workshop?
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Mungel
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 17:21 - 21 May 2011    Post subject: Reply with quote
Took it for a run and got it up to temp.

Revved the tits off it a few times, no sign of smoke from the exhaust, black or blue... Question

I guess a compression test is next on the cards. Thumbs Up
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MaybeGuy
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PostPosted: 17:51 - 21 May 2011    Post subject: Reply with quote
what's your oil level like? that's what i was getting at in the first post. the second option was just a possibility
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 17:54 - 21 May 2011    Post subject: Reply with quote
Could also be valve stem seals.

Is it using any oil? My Buell had a really serious oil consumption issue caused by knackered rings, and it didn't smoke or anything. I only found out when I took the airbox lid off and found oil coming from underneath the throttle butterfly. I initially thought valve stem seals but it turns out it was knackered rings. The rings hadn't been tempered properly in the factory and needed replacing.
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MaybeGuy
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PostPosted: 18:02 - 21 May 2011    Post subject: Reply with quote
No marjay...
no
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 18:14 - 21 May 2011    Post subject: Reply with quote
Oil level is same as always. It doesn't use any. Last two oil changes have been carefully filled to the exact middle of the sight glass and there it stays until next change.
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MaybeGuy
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PostPosted: 18:18 - 21 May 2011    Post subject: Reply with quote
i'm not implying it's using any, i was suggesting the level may be high. Did you check it when the bike was on the sidestand or a paddock stand?
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Blue_SV650S wrote: it was a sh1te wheelie, but it proves that he can get it up in 3rd and can do angles. In summery, mattsprattuk is a gobby little sh1tebag, dopehead tw4t, but sadly for all of us, he probably isn't THAT full of sh1te!! Mr. Green
Kickstart wrote: Hi I tend to agree with Matt. All the best Keith
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 18:40 - 21 May 2011    Post subject: Reply with quote
mattsprattuk wrote:
i'm not implying it's using any, i was suggesting the level may be high. Did you check it when the bike was on the sidestand or a paddock stand?


No, I appreciate the help and ideas (though the thought of a 'ring' problem smarts a little).

I always checked the oil, when cold, with the bike held upright, on a flat surface... I assumed that this would be the correct way to read the sight glass.

I have wondered about a pressurized sump for a while now, due to an unexplained and intermittent leak from the output shaft (behind the sprocket, it accumulates on the side stand..)

Guess I will get a compression tester later this week and check the cylinders.
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 19:06 - 21 May 2011    Post subject: Reply with quote
mattsprattuk wrote:
No marjay...
no

If you'd like to explain...? This was not only my own conclusion but the conclusion of a mechanic with 30 years of experience working on Harley and Buell engines.
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Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 19:23 - 21 May 2011    Post subject: Reply with quote
In your picture, it looks very clean and clear for engine oil that's spent 3.5k miles in a sportsbike.

If the stuff in the engine is black and sooty and that stuff is clean and clear, I'd suggest it's possible it didn't come from the engine. But then where?
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Mungel
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Joined: 21 Apr 2005
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PostPosted: 19:46 - 21 May 2011    Post subject: Reply with quote
stinkwheel wrote:
In your picture, it looks very clean and clear for engine oil that's spent 3.5k miles in a sportsbike.

If the stuff in the engine is black and sooty and that stuff is clean and clear, I'd suggest it's possible it didn't come from the engine. But then where?

I think the camera has lightened the colour slightly.
The oil is not a bad colour, but is defo ready for a change.

I tend to change the oil between 2.5 - 3k, and due to a few issues before have dropped oil out which was barely a month old.

I have deliberately left this oil in for 3.5k this time to get to the 7.5k for the valve clearance check..

I used Castrol Power stuff which was a red colour when it went in.
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Mungel
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