Took the boat out for the first time today after rebuilding the motor. Ran fine other than at about 2500 rpms and up there is a "pinging" sound. Wondering if it could be the exhaust shutters or perhaps a timing issue? I have a 1984 Century 3000 bow rider with a mercruiser alpha one and chevy 305 thunderbolt 4 ignition. Thanks in advance for your help!
