I am going to do a coolant change on my 919 this weekend, however the space where I can work on it currently has no running water. I can bring water to it, but that gets us to the question: How many gallons of water will I need to flush out the system after draining the coolant?
OHHHH!!! I can answer this one! holy shit i can actually use shit ive learned on here and give it back some!
I would buy 2-3 gallons of distilled water, I think about 1 gallon of distilled water will do a proper drain/flush of your coolant system total. I recently did this cause i was diagnosing cooling issues, and it took 3 flushes to get it completely clear n clean.
I recommend pulling the siphon tube off of your radiator filler neck, and giving your coolant reservoir a thurough rinsing out with normal water from a hose, with a little pressure to get rid of residue that builds up in there.
After using a little pressure to break up that crap with normal water, do a couple rinses with distilled water and you're good! You can do this with just the siphon tube disconnected from the neck, and use pressure to push out remaining liquid from the tube/reservoir, or you can route it down and allow gravity to drain out.
hope this is helpful!
EDIT: i see you have no running water there...was very eager to be first poster at 4am lol you prolly have more tools than i do, if you can't bring a hose to where you are working, you can always use a spray bottle to siphon out the coolant reservoir, and then go at it with distilled water, but it can take a while to break up the gunk in there, of course if gunk doesn't bother you you should be good with a couple rinses/siphons .