I was looking at some information on exmarks the other day and see they are now offering a 31hp gas engine and a 29hp diesel. It seems like the engines get bigger and bigger every year. I have a Lazer Z with the 23hp and it seems to do just fine. My question is what do you think should be the minimum size of engine for a 52 or 60 ZTR? Is there really that much advantage over a 31hp than a 23hp after you consider the added cost to run it? If anyone could shed some light on this subject for me I would be greatly appreciated since I would like to buy another ZTR this year.