rebuilding 1978 70hp Johnson

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rjs0414

Recruit
Joined
Mar 26, 2008
Messages
2
Does anyone know that gap opening measurement for the standard piston ring
the bore size on the piston is 3.00
 
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Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: rebuilding 1978 70hp Johnson

Welcome!!


The service manuals of that era will say .007 to .017. With the ring material that's used today, and the heat of todays fuel, .022 or so on a new ring isn't unusual.
 
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