This is an old thread, but I came across a Service Instruction today that answers this question. See SI-912-I-011. On the 912-iS the crankshaft end plug is aluminum and has a low torque value of 35 NM.
39031_2_SI-912i-011_Maintenance information on plug screw M22x1.5 part no. 940520 for ROTAX 912 i Series.pdf (You do not have access to download this file.)
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