Is this any good??

All though the head radiates most of the heat from combustion it isn’t going to run as cool
as say a late model YZ250 Hint, Hint (if your going to go thru the trouble if mounting a radiator and pump)
I had a similar setup on a old Honda FL250 odyssey but it needed it (motor in the back) IMO if
you want to go water cooled, Drop in a YZ