Join Date: Dec 2016
Location: Meanwhile in Canada.....
It gets down to -40 here so us damn Canadians have a lot of experience dealing with cold.
50/50 mix of antifreeze and distilled water is what you need. The glycol in the antifreeze keeps it from freezing, and the anti corrosive additives keep it from corroding. Simply drain the existing coolant and replace with this stuff. Top up the reservoir, let it run for a few minutes, and you're done.
"Tipping the bike over a couple times" does not get ALL the water out of the pump or water jacket of the engine. That doesn't work at all and being someone who runs a parts desk at a local dealership I sell quite a few rads and water pump covers due to that horrible advice. It will still freeze and crack. Please don't do that. Plus if you leave your coolant system empty you will accelerate corrosion while drying out your seals.
Your track tech won't want to see glycol in the spring (if you crash and it leaks it's super slippery and a b!tc# to clean up) so when the risk of freezing subsides drain out the glycol mix and replace it with whatever you're running now.