Low top end speed 4.3lx?

[Dillle209]

hey so i have a 1996 Larson 174 sei with a 4.3lx with 400 hours with a 19 prop and i can only reach about 35 at 4200 rpm i can go higher on rpms i just don’t like to wot .is this a normal speed at such a high rpm ?

 

[alldodge]

Your motor can do WOT and this is the only way to know if your propped correctly. You should be able to get between 4400-4800 rpm

 

[Scott Danforth]

you need to test WOT with the throttle mashed against the stops.

this is normal and you can run the motor there for a short period of time to test your top speed.

 

[jimmbo]

What gear ratio does your engine have?
You have to prop it so it runs within its recommended rpm range at WOT, not because you want to go run a certain RPM at a certain MPH.
A 17 ft boat with a 4.3 should see around 45-48 mph at WOT