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RE: [ST] Compression Test
- Subject: RE: [ST] Compression Test
- From: "Dave Bardell" <dbardell@xxxxxxxxxxxx>
- Date: Wed, 23 Jul 2003 08:23:19 -0400
Rich,
A compression reading that is low could indicate bad valves as well as
rings. But if it is spitting oil back into the air box, I would suspect
blow by from bad rings raising crankcase pressure and causing the oil to be
forced into the airbox. Or a blocked crankcase vent could be another
possibility.
Just my thoughts
Dave Bardell
- -----Original Message-----
From: owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx]On Behalf Of
Masiak, Richard
Sent: Wednesday, July 23, 2003 7:51 AM
To: 'ST@xxxxxxxxxxxxxx'
Subject: [ST] Compression Test
My kid's XR50 is, in my opinion, spitting too much oil out the airbox hose.
I was told that it's not just one thing that can cause that. My first
troubleshooting step is going to be a compression check to see if the rings
are shot or if there's a valve problem.
Intuitively I understand how to read the results that would tell me the
rings are bad, but how can a compression check tell me if I have valve
trouble. Can anyone elaborate in dummy terms?
- -Rich
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