boatinfo.no/lib/library html
Sometimes it works ,sometimes it doesn't.You could google free service manuals.
Good for you to buy the new carb, It aint that easy to clean and rebuild a carb, lots of posts have problems.
You should go through your whole motor clean and replace all the standard yearly routine maintance stuff,
Gear lube with new washers/seals
Clean plugs with toothbrush and cleaner,regap,test with multimeter.
New USCG A1 fuel lines, not sure you need a fuel water separator on a five horse,
New on motor fuel filter,
New fuel primer bulb,
You don't need to clean your new carb,
Long story short its lack of maintance, dirty fuel system.