PCV mod question - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 2 Old 08-31-2008, 12:12 PM Thread Starter
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Join Date: Mar 2008
Location: Souderton, Pa
Posts: 211
PCV mod question

What have you guys seen as the benifit to this mod? Seems like a pretty fast cheap mod.

The other question is: Ok you are allowing the pressure from the crankcase to flow in (or vented) only one direction, away from the crankcase lowering the pressure in that area on the down stroke. Now the theory is that the piston will have less pressure to work against on the down stroke helping in less oil consumption . Right? If the volumn of air is reduced in the crankcase on the down stroke then what fills it on the upstroke? With the PCV valve installed it won't equalize through there any more. Would this one way system contribute to some seal or gasket leakes? I'm sure you don't want to create a vaccuum in there. Also there isn't any check valve in the system now wouldn't the pressure be equalized as the stock system is now? What is the advantage to the PCV valve being installed. Seems to me the pressure is getting out as it stands with the stock setup.

I know there must be an advantage here what is it?


Souderton, Pa.
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Last edited by thumbs; 08-31-2008 at 12:14 PM.
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post #2 of 2 Old 08-31-2008, 09:10 PM
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Join Date: May 2007
Location: Richmond, Ky
Posts: 1,980

Scroll down a bit on the thread above and I think your questions will be answered.

2008 DL650 VStrom Yellow and Black
Previous ride was a 2007 KLR Black/Silver, I miss it..
Looking to get back into KLR's sometime soon.

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