Has anyone had any engine trouble with their BR600's? I had one go down yesterday. It was 1.5 years old and the mechanic said it "dropped a valve". He said it wasn't worth fixing. Then he called back shortly thereafter and said that stihl was going to put a new engine in it for free due to the problems they were having with the the 4 mix machines. To make a long story short. If you have problems in the future make sure you have you're dealer contact tech support and you may be able to get the unit fixed for free even if it is out of warranty. I probably have about $5 grand worth of 4 mix handhelds and it's been my experience that they are borderline junk. I can't count how many times I've had issues with these units. If it wasn't for the dealer, Stihl and I would have parted ways a long time ago.