OK I am getting the heat collar made for the smart carb on my build... they called to confirm the coolant hose is 15mm... I sent my head and jug off and I threw out the hoses... could someone Co firm that measurement?
TrailTech lists the CR500 as 19mm but getting their temp sensor installed was a pain so I would agree that 15mm is likely whats used on the lines from the cylinder head to the radiators.
