I just bought one and when I picked it up the dealer told me it is cold blooded. That would be an understatement. You have to let it sit there with the throttle pretty high for a couple of mintues before you even think about engaging the blades. Even after using it is for a while then shutting it off, wait 10 minutes you have to let it warm up again. Also it backfires alot, when you engage the blades if the engine blogs it back fires. Shut it off without letting it idle for more that 20 seconds, it backfires. I talked to my dealer and I knew it was the first year for this engine but I guess to sum it up, I'm not that impressed at all. Anyone else running into these problems??