It seems likely all the OE radiators leak eventually Ben. The plastic side tank to aluminium core interface being the usual place. Remember also the same radiator was used on the Roadster as lower powered Classics so greater heat stress.

[Linked Image]

Mulfab are the only remaining company offering all aluminium replacements.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone