Volvo penta 5.7 motor won't go over 2500 rpm.keeps reverting to safe mode

by Paul
(London, Ontario Canada)

We have a 2003 Cabrio 257 Larson express cruiser which on August 5 blew a piston. The motor has been rebuilt and on test drives it goes into safe mode (2500rpms). What could be causing this. The mechanics are replacing parts but still not working.

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