<< From: Byfield@aol.com <Byfield@aol.com> >>
I think that the M37 takes a similar (if not identical) plug to the
M151-series.
I have two references.... Champion XMJ-17 or Autolite AR7S. Be careful
though, Autolite also do an ARL7S.... which is a long-reach version of the
waterproof plug. Its reach is long enough to hit the piston crown on a
side-valve engine (like the M37), so stter clear of that one.
hope this helps....
Kind regards....
Ken
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