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You can damage it by not alowing it to be heat soaked first! No physical signs does not mean that there is NO damage at all to a nitro engine!

A piston & sleeve can be damaged with out any scaring!

Be aware that some pistons can not be at bottom dead to take the backplate off , not sure about that engine ,but on some ,the piston will go down in a groove that is in the backplate on bottom dead ,you will stand to damage the piston if that is the case ,always set the piston up a little in the...