Either 300 cylinder fault or a certain batch of porous cases, that coincidentaly got used on 300's.
Maybe assembling the engine cases with cylinder, without gearbox, crank, piston, and connecting cooling system, pressurizing it and observing.
Andrea is on forum, but is not very active, I've sent him email.
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EC 300 2008
EC 300 2018 GP
tenere 700
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