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Just curious, a buddy calls me and asks about a 175 Johnson and says one cylinder has no compression. My initial thoughts are stuck rings, broken reed, both or wrecked piston. We will be scoping it soon when the guy brings it over but wanted to get some feedback here as well.
 

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Just curious, a buddy calls me and asks about a 175 Johnson and says one cylinder has no compression. My initial thoughts are stuck rings, broken reed, both or wrecked piston. We will be scoping it soon when the guy brings it over but wanted to get some feedback here as well.

Piston, probably has a hole burned in it. Rings will lower compression not go to zero compression, unless a ring broke and tore up the piston and cylinder walls.
 

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Discussion Starter #3
We will be scoping it, and that is what I thought too that it is likely the piston and require a rebuild


Piston, probably has a hole burned in it. Rings will lower compression not go to zero compression, unless a ring broke and tore up the piston and cylinder walls.
 
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