Muffler Mod
I run a Husqvarna 232R brushcutter. I bought it primarily due to price - seemed to be the best bang for my buck. It does a fine job for me, mostly clearing thick grass and weeds. I also have a string trimmer head for it, making it quite versatile. The catalytic muffler made it run, what I felt was, EXTREMELY hot. Anyhow, I decided to ditch the cat and open the muffler up. Didn't do anything too crazy...check it out below.
Here is the stock muffler on my Husqvarna 232R Brushcutter after taking it apart. I used a 00 brazing tip on my oxy/acetylene torch to heat the seam on the muffler red-hot, and pryed up the metal with a screwdriver to separate the two halves of the muffler. The piece on the right is the catalyst part of the E-tech catalytic convertor muffler. You can also see the two small outlet holes. The factory muffler only had one, I added the second almost immediately after I got it.
Next, I cut a baffle out of 20ga sheetmetal. I used tin snips, cleaned it up with a grinder and hand files. I traced out the 3 holes of the bushings (keeps the muffler from squashing when tightened on the machine) and drilled them out. I then used a punch to mark out where I wanted to drill holes in the baffle. This new baffle I made has a LOT more surface area than the old catalyst baffle, but will still provide back pressure which the engine needs.
Finally, I assembled the muffler halves back together, making sure everything lined up and all necessary parts fit up properly. Heat it back up with the torch, crimped it with some pliers. After it cooled, I decided to enlarge the outlet hole again. After I was all finished, I wire brushed it, cleaned it off and gave it a nice coat of flat black BBQ paint. All ready to go back on the machine!
She runs nice and cool now! Even allowed for easier adjustment of the carburetor and smooth tuning.