So the fan on a 1050 doesn't run after you shut off the bike? My '03 will continue to run with the bike off and key removed until the engine reaches a cool enough temp.
I use Engine Ice and it works just fine. The manual specifies ethylene glycol, Engine Ice is propylene glycol. Propylene glycol is safe for aluminum blocks, and most tracks will require that you have propylene glycol, I think because it's not as slick if it leaks, and not to mention it's not nearly as toxic as ethylene glycol. Engine Ice comes premixed so you don't have to dilute it with distilled water.
I've read a number of posts complaining about brown muck coming out during their first coolant change. I highly recommend changing the coolant well before the specified 2-year interval using the following procedure:
- drain your coolant per the manual.
- fill with distilled water. Remove air bubbles in the line. Run the bike up to temp. Let it cool. Drain.
- Fill with 50/50 distilled water and white vinegar. Remove air bubbles in the line. Run the bike up to temp. Drain. The slightly acidic vinegar helps remove corrosion and scale.
- fill with distilled water. Remove air bubbles in the line. Run the bike up to temp. Let it cool. Drain.
This should thoroughly clean out all the muck. Then fill with Engine Ice, top off the expansion tank, run the bike up to temp, let it cool, inspect the level in both the radiator and the expansion tank and top off.
Disclaimer

this is all wrt my '03, but I'm sure it's very similar for the 1050's.