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Chainsaw
Stihl MS171 cylinder compression
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<blockquote data-quote="buzz sawyer" data-source="post: 8242450" data-attributes="member: 9385"><p>Does your tester have the valve in the end that screws into the spark plug hole? If not, you are adding volume to the combustion chamber - giving a low reading. That's what happened to me so I machined a valve to fit in the end of the adaptor. btw, I am only getting 130 -135. It runs fine.</p><p>[ATTACH=full]1177594[/ATTACH]</p></blockquote><p></p>
[QUOTE="buzz sawyer, post: 8242450, member: 9385"] Does your tester have the valve in the end that screws into the spark plug hole? If not, you are adding volume to the combustion chamber - giving a low reading. That's what happened to me so I machined a valve to fit in the end of the adaptor. btw, I am only getting 130 -135. It runs fine. [ATTACH type="full" alt="adaptor 2.jpg"]1177594[/ATTACH] [/QUOTE]
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