This is actually for my parents' boat. They have twin 8v92's with 735 HP, vintage 1985. The port engine will not get above 1,700 RPMs. Boat was hauled a couple of weeks ago. New bottom paint, cutlass bearings, and both props were changed out because the props that were on there needed reconditioning. Prior to the haul, the engine would not turn up past 1,700 RPMs, so it's not the props. We've checked the throttle cable and it is pushing the throttle to the limit. Fuel filters (primary & secondary) have been changed.

Upon planing, you get the usual smoke, but it clears up once on plane. The starboard engine was just rebuilt last year, after a local yard "blew it up". Port engine was only running around 1,700 RPMs at that time and we were going to do more investigation, but weren't able to accomplish this last season as the other engine was being overhauled.

It's been a busy summer, so we're finally getting into it now.

Any help or suggestions would be greatly appreciated.