Hi
Don't quote me. But we all know someone who has the initials BW (or RW!)
The Water Pump on my Nordi is marked RW and has a solid ended shaft.
I suggest it is an Italian pump fitted with a new shaft supplied by RW in 2011. (Maybe?)
if it is that good news
If it is not leaking and rotates smoothly...leave it alone (for now)
Again no guarantee try Yamaha XT or XJ for the choke cable or TDM?
Good Luck
“There is a delicate ridge one must ride between fear and reason on a motorcycle lean too far in either direction and there will be consequences.”
Lily Brooks-Dalton, Motorcycles I've Loved: A Memoir