Re: 225 ficht overhaul (THERAKE)
I reccomend you buy an original OEM Evinrude service manual.
It extremely detailed with text and photos and will provide torque specs as well as special tool and sealant info.
You better take a good look at the injector on that cylinder as well.
If you have any question about it, replace it or send it to DFI Technologies and have them test it for proper operation.
I would also replace the water pump & inspect the rest of the cooling system and replace as necessary.
You can install E-TEC 90 degree V-6 thermostats which open @ 141F instead of 134F like your originals. I would also install QC10WEP Champion plugs and index them properly.
I would also replace the oil lift pump with a new one just for good measure.
I would clean and service the oil tank & filter as well before returning to service.
Good luck.