As I mentioned coolant choice was a big deal when I bought my first Valkyrie in 1998. Most coolants back then contained silicates as corrosion inhibitors, but Honda water pumps didn't like that. There were many stories of owners replacing their coolant with whatever they found on the shelf at Wal Mart, only to see a puddle of coolant under their water pump a few days later.

Today nearly all coolants are silicate free, even the basic Prestone that's sold everywhere. I've read that stuff is now a 'Dex-Clone' formula. Apparently Asian vehicles use a phosphated formula because of the water found in that region of the world. So it's probably best to stay with what was in it originally, since a drain leave quite a bit in the engine.