It's been 5-6 years since I last modded a Dolmar 7900. I never was quite satisfied with the results I was getting at that time. I've followed MillerModSaws threads very closely. I've talked to Randy and Poleman as well. I owe a lot of this build to them. I've taken what I learned from them and applied it to this new 7910. Thanks guys!
Here's the saw as I received it, straight from our friend FordF150.
Those of you that have followed some of the other 7910 threads will know that they have a very restrictive chamber in the muffler. This chamber actually protrudes from the muffler and inserts into the exhaust port. The muffler must be uncrimped and this chamber removed. I then cut the chamber and the protrusion from the thick metal flange they're welded to. I ground most of the grooves from the exhaust port. This meant a LOT of port matching on the thick flange of the muffler. Lots of extra work on this saw in the muffler and exhaust port!
Here's the saw as I received it, straight from our friend FordF150.
Those of you that have followed some of the other 7910 threads will know that they have a very restrictive chamber in the muffler. This chamber actually protrudes from the muffler and inserts into the exhaust port. The muffler must be uncrimped and this chamber removed. I then cut the chamber and the protrusion from the thick metal flange they're welded to. I ground most of the grooves from the exhaust port. This meant a LOT of port matching on the thick flange of the muffler. Lots of extra work on this saw in the muffler and exhaust port!