oneoldbanjo
Addicted to ArboristSite
I wanted to do a muffler mod that would provide more performance without a bunch of extra noise - and one that would still look reasonably stock. I opened up the holes in the cage in the muffler and added extra ones on the front. In order to enlarge the holes in the bottom I cut a window in the bottom of the muffler, made the holes in the bottom larger and then drilled holes in the plate above the muffler inlet, and then welded the piece from the window I cut in the bottom of the muffler back in. I then removed the spark screen and opened up the hole to allow more flow, and then I welded on an extension to get the exhaust to go forward more so that it doesn't blow exhaust all over the saw. I put the spark screen back into the muffler after I painted it.
The muffler mods increased the no-load rpm by about 1,000 rpm - although some of that may be just proper tuning as I believe the saw was a bit rich as it was only turning 12,300 rpm before the muffler mod. I tuned it to 13,200 and it still sounds a bit rich. I cut up a 30" White Oak over the weekend and it worked great and was not much louder than the stock muffler.
The muffler mods increased the no-load rpm by about 1,000 rpm - although some of that may be just proper tuning as I believe the saw was a bit rich as it was only turning 12,300 rpm before the muffler mod. I tuned it to 13,200 and it still sounds a bit rich. I cut up a 30" White Oak over the weekend and it worked great and was not much louder than the stock muffler.
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