Wilsons Sandbox

Posted: **Mon Nov 13, 2000 8:47 am**

Hi all, Quick question: Is there any special way to check engine compression because of the automatic decompression system on the bike? I'm gonna get a compression tester this week and want to assess the wear on the engine. Also, what is the healty Psi range? Thanks Pascal A-1

Posted: **Mon Nov 13, 2000 9:22 am**

Pascal anctil wrote:

> Quick question: Is there any special way to check engine compression > because of the automatic decompression system on the bike?

No.

> I'm gonna > get a compression tester this week and want to assess the wear on the > engine. Also, what is the healty Psi range?

77-124psi. Mister_T

Posted: **Mon Nov 13, 2000 7:34 pm**

In a message dated 11/13/00 10:25:41 AM Eastern Standard Time, tedp@... writes:

> > I'm gonna > > get a compression tester this week and want to assess the wear on the > > engine. Also, what is the healty Psi range? > > 77-124psi.

47 psi range? Sounds rather absurd! Can anyone explain?

Posted: **Mon Nov 13, 2000 8:04 pm**

At 8:34 PM -0500 11/13/00, TimHiles@... wrote:

>In a message dated 11/13/00 10:25:41 AM Eastern Standard Time, >tedp@... writes: > >> > I'm gonna >> > get a compression tester this week and want to assess the wear on the >> > engine. Also, what is the healty Psi range? >> >> 77-124psi. > >47 psi range? Sounds rather absurd! Can anyone explain? >

It's in the service manual under top end specs for useable compression. I'd say it's not to absurd as my ultra-abused 44,000+ mile A2 blows LOTS of oil past the rings & therefore probably has low compression, but still runs like a champ, and I don't mean Plymouth Champ. Mark B2 A2

Posted: **Mon Nov 13, 2000 8:09 pm**

In a message dated 11/13/00 9:04:09 PM Eastern Standard Time, mjv2@... writes:

> I'm gonna > >> > get a compression tester this week and want to assess the wear on the > >> > engine. Also, what is the healty Psi range? > >> > >> 77-124psi. > > > >47 psi range? Sounds rather absurd! Can anyone explain? > > > > It's in the service manual under top end specs for useable compression.

I think that explains it, the original post said "healthy" compression, not useable.

Posted: **Tue Nov 14, 2000 7:49 am**

TimHiles@... wrote: [manual spec compression]

> > 77-124psi. > > 47 psi range? Sounds rather absurd! Can anyone explain?

Due to the auto decompressor ("KACR"), minor variations in wear on the valve seat and KACR mechanism can alter the range of acceptable results. With the KACR, a compression test no longer tests just the bore and valve sealing. Mister_T

Posted: **Thu Nov 16, 2000 12:21 pm**

This question came up a few months ago, and I remember reading that the de-compression mechanism meant that you couldn't get an accurate reading; this is why the spec is so wide in range. If this is true, then all you can tell from a comp tester is if things are really duffed ie below 77psi at startup. TimHiles@... wrote:

> In a message dated 11/13/00 9:04:09 PM Eastern Standard Time, mjv2@... > writes: > > > I'm gonna > > >> > get a compression tester this week and want to assess the wear on the > > >> > engine. Also, what is the healty Psi range? > > >> > > >> 77-124psi. > > > > > >47 psi range? Sounds rather absurd! Can anyone explain? > > > > > > > It's in the service manual under top end specs for useable compression. > > I think that explains it, the original post said "healthy" compression, not > useable. > > Visit the KLR650 archives at > http://www.listquest.com/lq/search.html?ln=klr650 > Support Dual Sport News... dsneditor@... > Let's keep this list SPAM free! > > Visit our site at http://www.egroups.com/group/DSN_klr650 > To unsubscribe from this group, send an email to: > DSN_klr650-unsubscribe@egroups.com

Posted: **Thu Nov 16, 2000 1:22 pm**

Wilsons Sandbox

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