A log entry removed for repair is only applicable to an ELT, because is covered in the FAR's. (91.207)
In this instance, he cannot sign it off as airworthy, unless you have a minimum equipment list approved for your tail number, and specifically lists the inop motor. Basically, it it is installed, it must be operating in accordance with its installation.
FAR 91.213 covers this subject.
If the engine starts to overheat, and the cowl flaps are wired to the half open, how are you going to get the additional cooling required?
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