Herman,

I was just re-reading this thread and thinking about your situation, and wanted to further comment. If you do go to a big bore kit on your 912uls I'd be willing to bet you will love that 75 inch Whirl Wind you bought.

Many of the Highlander guys run the 75 inch Kiev and love it. And while it works well overall on the 912uls, it really works well on the 914, having just that little extra power. Oh, and fwiw, the WW and the Sensenich blades look almost identical to the Kiev, so I think you have a great prop in that WW.

With all that said, let's stay in touch on this subject. If you get really frustrated with that 75 WW I would consider a swap on one of my 70 inch props, even just as a test. I do fly floats mainly, so a longer prop is always better for getting off the water. But like you I want good takeoff and good cruise, and on the 912uls I feel the shorter 70 inch blades work better. But with more hp the longer prop really is the hot ticket. So if you really want to go to the big bore kit, you probably want to keep that beautiful 75" Whirl Wind.