Originally Posted by whackywoody
Thanks everyone for their responses as you have confirmed my suspicions
I have seen another article about removing restrictor plates on yamaha 4 stroke engines to allow more fuel and air to the engine to produce more power. See youtube link below but must admit narrator is pretty boring
Does this look like a feasible option to increase power?
I'm pretty sure somebody is gonna tell me to buy a bigger engine as it will be the only solution
Restriction plate, different carb, tweak to the spark advance. Bottom line is outboards sell in relatively small volume to their development costs. So if you can use one set of expensive castings on two or three products...
If your engine has a higher horsepower identical weight sibling chances are you will be able to up the gee gees.
If its the top hp of a group of similarly lardy lumps you are into bespoke re-tune territory to get more out.