djoyner,

From the symptoms, it sounds like the compression may be shot. Unfortunately, there are no parts available from us or O.S. to effect repairs. You'd need at least a new piston ring and liner. Perhaps the valves aren't sealing, too.

O.S. replaced the FS-61 with the FS-70 Surpass, which has been replaced with the FS-70 Surpass II.

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