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Old July 29th, 2018, 06:08 PM   #1
LeakkyBoi
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Need help identifying missing screw that seems to be causing an oil leak

My 2012 Ninja 250r has a bad oil leak, but I think I've managed to identify the source. I don't have any mechanical experience so I need help identifying the missing part so I can order a new one to fix the leak. The spot where I think the oil is leaking from is on the left side of the bike, behind the chain guard. There seems to be a hole where a screw must have fallen out. Could this missing screw be causing a bad oil leak? What size screw do I need and where is a good place to order it? I have included two pictures showing what I have described above. Any help is appreciated, as I am a bit lost.
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Old July 30th, 2018, 05:07 PM   #2
snot
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Not sure if this helps...
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Old July 30th, 2018, 06:41 PM   #3
Dave Wolfe
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That hole is empty on mine as well. Nope it isnt the source of your leak. There is a overflow tube from the airbox to that area that may be putting oil there. There is an airbox drain plug on the left side bottom. Put a catch tray of some sort there and pull the drain plug. A lot of oil came out of mine.

Otherwise, it could just chain lube that you are seeing.
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Old July 30th, 2018, 06:51 PM   #4
DannoXYZ
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First steps to dentifying oil-leaks is to completely clean engine. So clean you can eat off it. I find removing engine to be much easier and faster to clean. Results in less time total to find leaks.

Then with completely spotlessly-clean engine, re-install, run it and look for where new oil drips come out. It is often higher up and drips downwards. Often from a gasket area such as valve-cover gasket or side covers. I find adding flourescent dye and shining flourescent black light (not filtered incandescent bulb) really pinpoints source of leaks.

Oil in area you posted would probably be flung off by chain. See this thread: https://www.ninjette.org/forums/showthread.php?t=320027

Remember, a clean dry chain is worn chan (and sprockets).
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