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Old 07-14-2013, 07:02 AM   #1
dirtriderbloke OP
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sight glass 3/4way full when cold!?? KTM EXC

hi there. i did another oil and filter change after another 20 or so hours of riding, but a little before that after a ride i had today, i checked the sight glass once engine was cooled down for 5 hours....and the oil in the sight glass was 3/4 way full while bike sitting evenly on horizontal stand.
I then started the bike up(before i was going to drain it) and kept an eye on the sight glass and the oil level went down to half way into the sight glass as engine was running for a few minutes.
PRIOR to this last ride, oil levels seemed fine and within spec(when engine was cold, it was just under half way, when hot, it was at 3/4 way), so what could've happened/made it go like that?

when i drained the oil, i measured how much was drained and got 1 liter out and previous to this oil change last time, I am 110% sure i did what everyone else told me and filled up with 1 liter plus 200ml or so to the filter housings.

no oil was leaking out whatsoever from the crankcase/engine breather, couldn't even see a trace of oil inside the whole hose and no oil was inside my airbox either, so i can confidently say it was not over full based off that.

so with all that in mind, i have 2 questions.
1. why on earth would the oil level with the bike cold, of been at 3/4 way to top of sight glass and why would it go down to half way when engine is running??

2. anything to worry about??(as i know how much i drained out and put in last time which was the correct amount)...not to mention, had no excess oil leak out breather hose or airbox

KTM 450 EXC 2004 for those that don't know

dirtriderbloke screwed with this post 07-14-2013 at 07:09 AM
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Old 07-14-2013, 10:42 AM   #2
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Old 07-14-2013, 10:52 AM   #3
dirtriderbloke OP
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lol?
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Old 07-14-2013, 12:31 PM   #4
clapped_r6
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this thread will help you

http://advrider.com/forums/showthread.php?t=896946
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Old 07-14-2013, 08:56 PM   #5
dirtriderbloke OP
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nope....didn't help. which part of that was meant to help me or answer my question exactly?
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Old 07-14-2013, 09:40 PM   #6
bomber1965
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plus





equals


problem solved!



next question.



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Old 07-15-2013, 07:32 AM   #7
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Once an engine has started running oil is pumped from it's sump into the filters, head, ect. When you kill the motor and let it sit for long enough the oil will make it's way back down into the sump. If you were to rev the motor up and immediately turn it off it would read slightly lower for the same reason.

Completely normal, nothing to worry about. You want to check it while the engine is warm.
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Old 07-15-2013, 07:56 AM   #8
Wargasm
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Wow, you might want to read a up on engine fundamentals. When stopped all or the vast majority of the oil is present i the sump, when running the oil is circulating throughout the engine causing oil levels to appear to drop. no need for concern, most oil level markings are for non-running engine oil levels so doesn't sound like you have much to worry about.
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Old 07-15-2013, 08:01 AM   #9
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Quote:
Originally Posted by cross-country View Post
Once an engine has started running oil is pumped from it's sump into the filters, head, ect. When you kill the motor and let it sit for long enough the oil will make it's way back down into the sump. If you were to rev the motor up and immediately turn it off it would read slightly lower for the same reason.

Completely normal, nothing to worry about. You want to check it while the engine is warm.
Doesnt KTM say to check it cold? Either way if the oil is half way up the sight glass your good to go and obsessing over it will make a person old.

Ride it like you stole it and keep the front end light!

(reading the manual can make many things clear)
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Old 07-15-2013, 08:02 AM   #10
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Some bikes the oil's completely gone from the sightglass when running.
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Old 07-15-2013, 08:03 AM   #11
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Old 07-15-2013, 08:10 AM   #12
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Originally Posted by Albie View Post
I'm just gonna walk away.
I was enjoying this one 'till they started answering seriously.
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