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Tip #3 - Johnson Model A Inner Muffler
of the opposed cylinder Johnson Model A motors have the inner mufflers
missing or badly deteriorated. You can easily make a replacement
that is spot-on for the original with common 2" copper plumbing
tubing available at many home repair or plumbing stores.
#2. A-35/A-45 Parts book - inner muffler
on upper left
#3 . Measure distance between muffler
ends (this will vary due to distortion of the muffler ends)
#4 . Ring compresser used to draw line
on copper tubing
#5 . Pipe cutter makes a nice clean
#6 . Parts manual indicated 12 holes
evenly spaced (this worked out to every 1/2" on this
#7 . Use of a punch to dimple the copper
makes it easier to drill. Note wood blocks used as cribbing
to hold tubing
#8 . Holes drilled with a 1/4"
#9 . Test fit new inner muffler to be
sure of a good snug fit.
#10 . Leftover copper pipe can be used
to roll out any dents in the outer muffler can
#11 . Install inner muffler with holes
#12 . Motor is now ready to run and will
be nice & quiet
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