Hey guys scratching my head with this one. Bought a used 90 from a reputable dealer who rebuilt the powerhead as part of the deal. They total me it had a failed cylinder which drove the rebuilt power head. Also told me they replaced the injector on the cylinder that failed.
When starting the motor at the dock idles fine. Put it under a little load and it sputters. Once it gets past this point she runs like a raped ape but… I can hear a noise that almost sounds like a metal to metal ping and the motor jerks when it happens. I then Drop down off plane and start over from idle. I hear it back firing as I go through the ranges to back up on plane. No metal to metal sound at the lower RPMs just a distinct sputter i.e. backfire. I’ve had it back to the dealer who did the power head but they seem lost. I have a boat ride setup with them for next week based on tide level near their shop.
Any suggestions so I can sound half way intelligent when I talk to these guys?
Everything new in the fuel system. I have replaced the fuel and associated filters.
Thanks in advance for any input.