I had a first time experience yesterday helping a friend out. He has a 2015 Harley that has watercooled heads. His water pump decided to stop pumping and needed to be replaced. Neither of us had ever done one before so it was interesting. We found out Harley doesn't use the same pumping system anymore, and now uses what they install on the 2017 and up models. That meant ripping a few feet of hose's, and the pump out completely. Nothing from the original system was used. Everything was new and redesigned to fit his bike. The thing is , you need to disassemble half the bike to get to the pump. After some head scratching, we managed to get the new pump and all the parts and wiring, stuffed into the tiny space allocated for it. Bleeding the air out of the system was a consuming, and the instructions say to ride it a few miles then check the coolant level again. I'm glad my bike doesn't have that setup, and I won't buy one that does.,,,