Max rpms are only 4200 when wide open. 2001,115 yamaha

[rodbolt17]

2 stroke turns 45-5500, the F motor is 5-6000.

[99yam40]

that makes sense I guess as the rated HP is at the upper RPM

[TownsendsFJR1300]

that makes sense I guess as the rated HP is at the upper RPM

Actually, the max HP on my F150 is at 5,500 (per the Yamaha shop manual)