I was cutting some lawns today for the first time with the 2009 Stander 52" rapid height with 19hp kawi and 550 hours that I picked up on craigslist. While cutting with the blades on I was noticing that for a split second it seems like the engine is going to cut out or hesitate like maybe how it would if your feet were to jump off the platform and back on or like running out of gas except I was firmly on the platform and I had a full tank of gas. It did this maybe 3 times during 1 hour of cutting. It was so quick that i didn't notice any loss of power or anything. Other than that it cuts great and i really like it.