85 four winns santara prop

[Myride85]

3.7l 190 hp I4. Just bout this boat a few weeks ago. Took it on the water for the 1st time Friday. 2000rpm max 25 mph was all it would do. 14.5x18 4 blade prop (it came with it). I know that needs to go. Can not find a recommended size I need for this boat. Haven’t tried the fuel line yet for collapsing. But this thing is a dog. Need recommended size prop.
think the 4 blade is keep this thing under rpm?

 

[GA_Boater]

Have you checked/tested compression and spark. The prop may be fine when the motor is running right.

Moving to the Mercruiser section.

 

[Myride85]

#1 130psi
#2 102psi yes a little low
#3 130psi
Can not get #4 plug out

 

[Bondo]

Ayuh,..... Welcome Aboard,.... At 100 psi, that's a dead cylinder,......

I'm also guessin' the fuel system is all boogered up,....

 

[Alumarine]

Are you sure your tach is ok?
25 mph at 2000rpm doesn't seem right.
Did you check that speed with a gps?

 

[Myride85]

Ayuh,..... Welcome Aboard,.... At 100 psi, that's a dead cylinder,......

I'm also guessin' the fuel system is all boogered up,....

That's what I'm afraid of. The dead cylinder. I tried it 2 times to make sure cause I can't get the hose in all the way.

 

[Myride85]

Are you sure your tach is ok?
25 mph at 2000rpm doesn't seem right.
Did you check that speed with a gps?

I didn't check it with gps. It may have been a little lower than that.

 

[Myride85]

Ayuh,..... Welcome Aboard,.... At 100 psi, that's a dead cylinder,......

I'm also guessin' the fuel system is all boogered up,....

When you say the fuel system is boogered up. What am I looking for? Fuel line collapsing? Scum?

 

[Myride85]

Correction on the compression check all plugs out

#1 155psi
#2 120psi
#3 120psi
#4 135psi

Butterflies in the carb are opening full throttle.
Oddly enough, I checked #3 compression yesterday. Put plug back in and found that plug snapped at the ceramic. Hmm

 

[Myride85]

Sorry for the multiple posts here.
But trying to get as much info out as I can
Retested compression again
#1 140psi
#2 120psi
#3 120 psi
#4 125-130psi

 

[Myride85]

Another update.
I pulled the fuel filter. It was the old style ceramic filter. Maybe? Soon as a store is open will be getting one.