Greetings! I just recently put together an old first gen seaducer with a GO .21 engine.
It's still in the break process; 9 10-oz fuel tanks so far(lights, you were right, it is a VERY tight engine at first)
I've been running it fat in the water with an old texas cut prop similar to the ones...
Andy, I have two K90s laying around with some extra parts. I was considering putting together an X Mono, but don't really see it happening.
As much as I'd love to put together a 90 again, i would consider selling everything K90 related i have.