Vittorazi Motors COSMOS 300 Maintenance Manual page 180

Replace the clamp each time it is disassembled.
Connect the radiator hose to the head and tighten the clamp with a specific pliers.
Check the squish measurement on 2 sides of the piston on the pin axis: acceptable values
range from 1,25 mm to 1,45 mm.
Cosmos 300 – Maintenance manual – V2 180