Oh no straight gas in the saw! I mistakenly refueled my Husqvarna 562 XP with straight gas about a month and a half ago. I noticed the mistake when I refueled again. It seemed to have compression, so I have used it since. It was reccomended to remove the muffler and check the piston. It's hard to see in the video, but the piston and rings look new. Just a slight amount of carbon on the very top of the piston, but considering that is the exhaust port side, not surprising. I still can't believe it.