windy hole - Kawasaki KLR 650 Forum
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post #1 of 15 Old 07-10-2014, 09:28 PM Thread Starter
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windy hole

While warming my KLR to enter the Coop,(old chicken coop converted to storage) I added my new EM oil cap. The out rush of air blew the old cap out of my hand.
Is this normal? (yeah the rock hard layers of chicken poop were a bish to get out.)
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post #2 of 15 Old 07-11-2014, 12:04 AM
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Was it running when you removed the cap?

My Kaw Barn - 2004 KLR, 2006 Concours (sold), 1997 Bayou 400.

"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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post #3 of 15 Old 07-11-2014, 06:26 PM
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Yes. it is normal. Each time the 650cc piston goes up and down it pulls/pushes 0.65 liters of air in/out of the crankcase. Normally this air comes/goes from/to the air box by way of the approximately 5/8" crankcase vent tube from the top of the transmission up to the air box.

When the oil fill plug is off, part of that air goes in and out through the fill hole.
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post #4 of 15 Old 07-11-2014, 07:09 PM
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Good answer!

So the moral of the story is, don't pull the oil filler cap off while the bike is running

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post #5 of 15 Old 07-11-2014, 07:19 PM
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Originally Posted by 650Stew View Post
Good answer!

So the moral of the story is, don't pull the oil filler cap off while the bike is running
If you do, don't be looking in the hole!
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post #6 of 15 Old 07-11-2014, 10:26 PM Thread Starter
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I was just peekin!
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post #7 of 15 Old 07-11-2014, 10:52 PM
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Lol

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post #8 of 15 Old 07-12-2014, 10:07 AM
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My stock oil cap failed and blew off one day. Luckily it was while I was in the drive way. Prompted for an immediate trip to EM for a billet cap. Havent had an issue since.
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post #9 of 15 Old 07-12-2014, 10:59 AM
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Originally Posted by shane.barton View Post
My stock oil cap failed and blew off one day. Luckily it was while I was in the drive way. Prompted for an immediate trip to EM for a billet cap. Havent had an issue since.
How did it fail? Were you using a wench on the thumb screw cap?
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post #10 of 15 Old 07-12-2014, 11:18 AM
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How did it fail? Were you using a wench on the thumb screw cap?
Not sure exactly what had happened. I usually just hand tightened the stock filler cap. I probably cross-threaded it, but the end product was it didnt hold in place. After switching to the EM filler cap, and being cognizant of proper threading, I have had no further issues.
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