PeteI would appreciate some guidance on the mesh size.
Since this strainer is on the suction side of the pump I would be leery of going any finer than what the factory used. I would hope the Yamaha engineers factored in the pumps flow characteristics in specing the mesh size. I would not be a good thing to cause pseudo-cavitation in the pump. If fixing a tear in it one needs to be careful not to cover any more than necessary.