I have a 2000 TTHP with 17hp Kawi, that needs a new head, $350 to fix it. I have had to do work every few months latley because I run it so hard I think. Anyway Id like to put a new engine instead, the biggest that would fit, the 17hp is way under powered for me. The dealer acted like it was going to be a problem to get a bigger engine on there, and would have to check with his supplier on monday. He also seems to hate Kohler and wants me to stick with Kawi are maybe Honda. I thought as long as the shaft was the same size I would be OK? Any suggestions on what engine would be best on the mower?