I have a 2006 Stingray 250LR with a 5.7 Volvo GI-F (specific numbers below) and recently just had the motor pulled and a decent amount of work done to it. Had oil leak so oil pan replaced, starter replaced, new motor mounts, new valve covers, manifolds/risers, fuel pump, and props refinished. Ever since the service the belt is squeaking (not replaced) and the acceleration is awful. at idle, the boat is the same, top speed is mostly the same (hesitates a little at WOT), but when we hit the gas to get up and go from no wake zone, the boat just sounds very throaty and takes forever to get on plane. We use the boat almost on a weekly basis so it runs through plenty of fresh gas that we get at our marina. We are in Florida so the boat is used year round. Any ideas? I did buy a new belt to hopefully stop the squeaking but haven't installed it yet (the old one does not seem loose). The mechanic that did all the work did say he adjusted some of the valves too. but the boat back in 2006 when we bought it used to go 45-50mph and now struggles to go 30, is it normal for a boat to lose that much power over time? Any help is greatly appreciated!
Engine 5.7 GI-F - 3869311 - 4012171401
Transom Assembly 3869341 - 4151108010
Drive Unit - DP-SM 1.95(M22) - 3868913 - 4202157526
Engine 5.7 GI-F - 3869311 - 4012171401
Transom Assembly 3869341 - 4151108010
Drive Unit - DP-SM 1.95(M22) - 3868913 - 4202157526