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FH641V engine in my Scag mower with low compression.

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RickHM
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2025/08/22 12:27:47 (permalink)
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FH641V engine in my Scag mower with low compression.

I have a FH641V in my Scag mower with low compression. How much can I bore the cylinder out to, and where can I get oversize pistons and rings from?
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    SRTsFZ6
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    Re: FH641V engine in my Scag mower with low compression. 2025/08/22 13:26:11 (permalink)
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    A complete engine MODEL # is needed to proceed.
     
    Go to this site:
    https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/kawasaki/4-stroke-engine/fh641v 
     
    Find your complete engine model info, then look up "piston", etc.  
    Under that section, you'll see oversized pistons.  
    (I picked one and saw a .050" oversize)/
     
    -Did you do a leak down test or bore scope to confirm it needs piston/rings, bore job? 
     
    -Do you have the engine apart already and check the bore(s), that
    their worn and that just a hone and re-ring won't fix your issue?
     
     .
    post edited by SRTsFZ6 - 2025/08/22 13:27:38

    Scott
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