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Old 08-05-2008, 03:28 PM   #1
loosenoose
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water in oil

i just did an oil change on my bike in the rain. i really needed one before i go back to work tomorrow, and i didnt think it would be any big deal. i screwed the oil fill cap back on and went inside to change into a dry shirt and get my gear on so i could go for a short ride. when i came back i discovered that the oil fill cap had vibrated off and i was seeing a lot of pressure moving in and out due to accumulated rainwater being blown and sucked into and out of the oil fill hole. i found the cap and screwed it on tight and went for a short ride i noticed that if i let the bike idle, the rpms will start to drop way low. i dont know if it will stall. i didnt really want to find out.
do you guys think this problem will work itself out with use or should i change the oil again? ugh. i really dont want to buy more oil.
i was only gone from the bike for maybe 3 to 4 min when i was putting my gear on, so not much water could have gotten into the engine, right?

i always have some kind of crazy thing happen when i do an oil change. i dont know what the deal is with that. whatever.
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Old 08-05-2008, 03:32 PM   #2
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change the oil
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Old 08-05-2008, 03:36 PM   #3
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yea, change it again
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Old 08-05-2008, 03:39 PM   #4
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ugh. i just changed it with motul. finest oil my cheap has ever paid for. :P
what if i let it sit for a few hours and siphon the water off of the top of the oil? is that crazy? it should be pretty well seperated
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Old 08-05-2008, 03:40 PM   #5
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yea i wouldnt recomend it
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Old 08-05-2008, 03:43 PM   #6
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champ you can do whatever you feel is right.

me and brandon think you shouldn't

im sure theres plenty of people that side with you.



But I try to value my bike a little more then $50 or less of oil
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Old 08-05-2008, 03:43 PM   #7
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did you set your bike under a downspout? Who changes their oil in the middle of a tropical storm (without cover anyhow)? Dumb thread if you ask me.
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Old 08-05-2008, 03:51 PM   #8
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It would help to remember oil floats on water, so siphon is out either way
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Old 08-05-2008, 03:53 PM   #9
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There couldnt be more than a few drops in there. The idle issue might be due to the weather.
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Old 08-05-2008, 03:55 PM   #10
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id stil change it just to be safe, you dont know how much water is in there
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Old 08-05-2008, 05:34 PM   #11
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i had a very large umbrella above the bike. i do not have a garage to work in. sometimes i have the usage of my parent's carport, but didnt want to ride in this weather to their house with the stuff needed for the oil change. i ride my bike daily to work and wont be able to tomorrow morning, so it was either now or next week, because it's dark by the time i get off work. so yeah, i'll change my oil in a tropical storm if i have to. the rain hasnt been that bad at all out here, just steady.
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Old 08-05-2008, 05:53 PM   #12
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Well, your choice.... I'd change it... but....


As mentioned above, oil floats on water, drain it into a drainbucket, would be awesome if you had a clear one... Anyways...

Let it sit overnight, buy a hand syphon for $2 at harbor freight or northern tool(or use a turkey paster... and start sucking it out from the bottom. When you get down to nothing but oil, that's the best you can do...

Or if you have a lot of time, start from the top...

I don't think unchurned oil/water homogonizes.

I personally, would replaced the oil. Water is not a lubricant your cylinderwalls would appreciate.
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Old 08-05-2008, 05:56 PM   #13
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depending on how hard it rained while you were inside you could have 1/2 a cup of water in there or more......the only way to know is to drain it....best bet would be to change it again.....but i've never heard of water in the oil causing idle issues.....I'm gonna go with bluewave and say it sounds weather related.
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Old 08-05-2008, 07:12 PM   #14
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Change it. Sorry to hear this, though.
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Old 08-05-2008, 07:45 PM   #15
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50$ of oil is cheaper then a new motor
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Old 08-05-2008, 07:46 PM   #16
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Well, your choice.... I'd change it... but....


As mentioned above, oil floats on water, drain it into a drainbucket, would be awesome if you had a clear one... Anyways...

Let it sit overnight, buy a hand syphon for $2 at harbor freight or northern tool(or use a turkey paster... and start sucking it out from the bottom. When you get down to nothing but oil, that's the best you can do...

Or if you have a lot of time, start from the top...

I don't think unchurned oil/water homogonizes.

I personally, would replaced the oil. Water is not a lubricant your cylinderwalls would appreciate.
This is what I was thinking also. Even though it was expensive oil, it's still not worth the risk of letting it go. Sometimes lessons are learned hard.

Some oil systems are pressurized and if the cap comes off or is taken off while it is running it could change the idle. I had a 280ZX that did this when I took the oil filler cap off while it was running. You could hear a noticeable drop in RPM's. I'm not sure about your bike but it's something to consider.
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Old 08-05-2008, 08:04 PM   #17
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^^^ positive crankcase ventilation system. its an unmetered air leak.
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