Sorry to hear your dissapointment in your new ST. If it performs like that and it is fully broke in then there is obviously something wrong. 5600 RPM loss cant be normal. ST can be very finicky for adjustments. I have had a ST 75 (the old style) for 8 years and it has been really reliable.

The shut off can be a possible low end setting not quite right. As far as the RPM loss goes it is either defective, not broke in or adjustment is wrong. Also, try a lower pitch prop for better climb (specs call for a 12X6 or 13X6).

tks1

The only problem I have had with ST is getting one (as per my post in the engine forum).