You can run the 550 electrics however you must change the 550 voltage regulator (V/R) to a 650 V/R. You will also need a 650 specfic pipe. The other member is correct you will need an adaptor plate to bolt the 650 motor to the 550 bedplate.
You will also need to increase the pitch of the impeller in the 550 pump to a 17 or greater.
Rock Couty Jet Sports in WI. makes a high quality adaptor plate.
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