Lakeside, this is not just the odd person saying this, these are high volume Logger supply chainsaw shops, and these are the heavy duty pro saws, not the consumer models. The EPA has caused alot of problems, since they started closing up the muffler holes and adding limiter caps. It would also be hell with ported mufflers. But ported mufflers is not the only problem, its the new carbs. These shop have been selling 2 or 3 hundred 660's a year. Walkers is well known, and the loggers I talk to say this themselves, its not that Stihl is making bad saws, just that conforming to the EPA is wrecking EVERYONES saws. I love Stihl and Husky bytheway, and Dolmar and other too. All have neg and positives. Most fallers saws here are all modified, and basically just to reverse what the epa has screwed up. Simonizer does 2 to 3 hundred in a normal year. The carbs all need to have the limiters cut.
Dave.
Dave.