No mine didnt tear it crumbled into peices! Another reason to love the makita/dolmar line metal gasket)haha. Lots of carbon build-up. This particular saw was my first. I bought it when i bought my property and wanted to start clearing. I had no clue then how to tune or care for a saw. Going to clean or replace the carb too we will see. As for the 7900 yes thats why I ask because I'm deciding wich paint to use and was wondering how hot these mufflers get. I know the ones with the cat gets really hot after some time. I like the rustolium engin enamol but its only 650 rated. Wanting to go with a good strong enamol this time not just BBQ paint. Its crazy makita dosent have better technical data on their web site. They must not want us to know! I called tech support today and they said they didnt know and would call me back with an awnser. Lol. I might only pull the guts out (if it has any) still doing my research. My muffler does not have the front support bracket so I'll probably just bore out under the deflector. Dont really need the power I just have alot of fun figuring it out and learning how to do it. Also it would be good to,bring down run temps.