A blown head gasket seems to be a bit of a unicorn event with the Pegaso, but you never know, it may just ruin the day of a spaceship mileage bike.

Also, the radiator is hard to repair and I have fixed the usual radiator damage with this stuff,[[https://www.apriliaforum.com/forums/showthread.php?301549-For-when-the-radiator-goes-pop-and-other-things&highlight=head+gasket | Hyperseal]], permanently.

It is well work having under the seat, or something similar if you are on a long trip.

[[https://www.apriliaforum.com/forums/showthread.php?301549-For-when-the-radiator-goes-pop-and-other-things&highlight=head+gasket | Hyperseal]]