Thinking about this more, you mentioned using ZAF blue which only comes as a premix. I don't know how the cooling system is on you cycle but in a vehicle, much of the capacity is left in the engine block with radiator d&fs. If that's the same case with your cycle, and you want to use ZAF you will have 'some' ZAF premix d&fs after you do the distilled d&fs. Now if it has an easily accessed block drain(s) you may be able to avoid that.
But thinking a hydrometer might still be needed to check the AF concentration if using a premix with radiator d&fs.
WM sells the Chaslyn five ball AF tester for ~$1 if you don't have one. I've used it on my vehicles and it works quite well.
But thinking a hydrometer might still be needed to check the AF concentration if using a premix with radiator d&fs.
WM sells the Chaslyn five ball AF tester for ~$1 if you don't have one. I've used it on my vehicles and it works quite well.