----- Original Message -----
From: "John Biccum"
To: "Rick McCauley" , "dsn klr650" dsn_klr650@yahoogroups.com>
Sent: Wednesday, October 21, 2009 7:59:57 AM GMT -08:00 US/Canada Pacific
Subject: RE: [DSN_KLR650] Re: Oil Consumption 2009 KLR **CORRECTION**
Positive Crankcase Ventilation has been around since at least 1968, I had a
PVC valve on a '68 Chev. It is not rocket science, the PVC valve is a
simple one-way valve. On the KLR it allows a low resistance method of
venting combustion fumes from the crankcase into the airbox. It serves to
recycle these fumes. Since no air can enter the crankcase through the one
way valve it prevents the crankcase from becoming pressurized.
Pressurization of the crankcase is believed to be a contributing factor for
oil consumption, particularly at higher engine speeds (higher crankcase
pressures).
Cary Aspy "KLR Cary" suggested the PVC valve should be installed when he put
together the 685cc kit. My bike was the first KLR685 on the road and Cary
fabricated a means of installing a PCV valve using vinyl tubing and elbow
fittings. You can see this early prototype here:
http://johnbiccum.smugmug.com/Motorcycl ... k#49977722_
w72sU
This PVC valve was on my KLR685 until recently when it rotated slightly and
was taken out by the shock. We know now that a PVC valve can be installed
in line into the existing crankcase vent tube using just a pair of hose
clamps to keep the valve in place. In the 30K miles my 685 kit has been in
place it has burned zero oil, even at prolonged 5500RPM running. Maybe the
PVC valve is a contributing factor, maybe not. It seems reasonable that a
pressurized crankcase would contribute to oil consumption although I lack
empirical data to prove that.
The PVC valve mod is a near zero risk and near zero cost mod so you have
little to lose. Why don't you try it and see if your oil consumption (if
any) changes?
From:
DSN_KLR650@yahoogroups.com [mailto:
DSN_KLR650@yahoogroups.com ] On
Behalf Of Rick McCauley
Sent: Wednesday, October 21, 2009 6:15 AM
To:
dsn_klr650@yahoogroups.com
Subject: Re: [DSN_KLR650] Re: Oil Consumption 2009 KLR **CORRECTION**
Does anyone on this list have an opinion, or better yet "facts" on the
benefits of the PCV mod?
Rick
A18
________________________________
From: guymanbro < guymanbro@... >
To:
DSN_KLR650@yahoogroups.com
Sent: Tue, October 20, 2009 9:42:08 PM
Subject: [DSN_KLR650] Re: Oil Consumption 2009 KLR **CORRECTION**
Or just use this link:
http://www.klr650. net/forums/ showthread. php?t=41326& highlight= pcv+mod
;')
da Vermonster
--- In DSN_KLR650@yahoogro ups.com, Jeff Saline wrote:
>
> WVDoran,
>
> Correction to my earlier post. Search for PCV or PCV Mod. : )
>
> Best,
>
> Jeff
>
> On Tue, 20 Oct 2009 16:57:48 -0600 Jeff Saline
> writes:
> > On Tue, 20 Oct 2009 14:16:17 -0700 (PDT) "W.V. Doran"
> > writes:
> > > I'm not familar with the PVC mod where can I find information
> > about
> > > it?
> > > TIA
> > >
> > > WVDoran
> > > Scottsdale, AZ
> > <><><><><><> <><><><>
> > <><><><><><> <><><><>
> >
> > WVDoran,
> >
> > Go to
www.klr650.net and then use the search function for PVC or PVC
> > Mod.
> > You should get a few good hits on threads discussing exactly what
> > to do
> > and who likes it and who doesn't.
> >
> > Best,
> >
> > Jeff Saline
> > ABC # 4412 South Dakota Airmarshal
> > Airheads Beemer Club
www.airheads. org
> > The Beautiful Black Hills of South Dakota
> > 75 R90/6, 03 KLR650, 79 R100RT
> >
> >
> > .
> > ____________ _________ _________ _________ _________ _________ _
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