jtracy1223
ArboristSite Operative
Here are the pics of the muffler mod I did on my stihl 290 tonight. I went with a 1/2" hole right threw the center of the indent and then cut off a good size chunck of the outter deflector. I would say the opening of the deflector is 3-4 times bigger than when I started. I took it back all the way to where the angle ends. I did not put any extra holes other than the one big one nor did I open up those tiny lil slots its expected to breath out of. If it would help more I still can but I think the big hole right in the center should do it? Correct me if I'm wrong. This is my first time doing this and I didn't even know it was an opption tell I found this site. I plan to pull the limiters and tune it tomarrow. I just got my works connecting tachometer today so I feel a bit safer having that to double check my ear tune work. I don't hear very well as it is and I think the problem will only get worse after I run this beast for a but. What kind of rpm range should I be shooting for on my tach?View attachment 301310View attachment 301311