Of course you can have hydra lock when attempting starting. To much fuel in the cylinder. You can clear it by removing the plug or turning the engine backwards. In most cases either will work.
BUT we are not talking about starting.. we are talking about running engines. Lots different situation.
As for rapid temperature changes that's good and bad news..
The good news.. it means the cylinder is transferring heat to the fins and off the engine.
The bad news.. It also means there is relatively thin material to aid in this efficient heat transfer.
Some where there is a balance.