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Seeking guidance for tuning a CH18S Kohler Command (1995), as replacement for a 16hp Onan (1990). This Kohler doesn't have the torque-grunt of this Onan, but it works, and is my available option. So, how best to tune the Kohler for this application? 1. I believe Onan and Kohler high RPM setting are both 3600? 2. Would it hurt the Kohler to boost that RPM to 3700-3800? Would it really help any? 3. Would it hurt the Hydro Transmission to go over 3600rpm? 4. I guess I could go find a slightly smaller Drive Pulley? And what would then happen to the Trans if I can't get the proper RPMs to the Trans? Now that I've figured out the mounting arrangements I can always swap in a bigger engine should I stumble upon a better option. Given the difficulties of getting the Onan rebuilt now-a-days, I'm looking to go for a more modern engine with easier to find parts/service. And I'm not inclined to do an engine rebuild myself. Thanks, - L.