I looked at the GP25 and liked how light it was. I originally was going to install the GP28, but after waiting 2 months I cancelled my order and got my money back.

I have a TT07 and it is a dog! Easy to run and reliable, just no power.
I also have the TT46PRO. I know many love this engine and I have seen it scream, but I was never that impresed with mine. But I may have broke it in too rich and caused my own problems. Therefore I decided against the TT.

My OS32F is in a Kobra. Easy to tune, super reliable, great performance. So the 25FX was a good deal at the right time.

Any tips on break in? My Magum 15 is a screamer after the following break in.
Bump caster in fuel by 4%.
Preheat the cylinder to allow the piston to travel without scrubbing in the pinch zone.
Start her up with a small prop 9x4?
Peak it out and richen a click or two.
Let run 1minute, cool and repeat.
3x1 minute
3x2 minute
3x3 minute
Fly it

The Mag 15 has about 10 hours without a problem other than shutting down. I'll see how the OS holds up. I have heard so many good things about this engine.

Thanks again all