A mechanic provided an inspection report on a 2014 Suzuki 4-stroke 150 engine, noting significant leakage across the cylinders. Cylinder (1) showed 20% leakage, cylinder (2) 60%, cylinder (3) 65%, and cylinder (4) 30%. The engine has 240 total hours, with 100 hours spent at idle speed, mainly used to pull a 16' trawl net.
The owner also reported a previous issue with a significant amount of water in the fuel system. This raises concerns about whether the issue could be related to the head gasket, or if there's a more serious underlying problem such as piston rings, valves, etc. Any advice would be greatly appreciated.
Additionally, what is the typical cost for a mechanic to replace the head gasket on a motor like this?
The owner also reported a previous issue with a significant amount of water in the fuel system. This raises concerns about whether the issue could be related to the head gasket, or if there's a more serious underlying problem such as piston rings, valves, etc. Any advice would be greatly appreciated.
Additionally, what is the typical cost for a mechanic to replace the head gasket on a motor like this?

