rpm and mph question?

[2003larsonsei]

ok, I'm new on here. My 2003 Larson 205 sei with a 5.0 gxi can't get above 3800 rpm and 32 mph. I have a 4 blade SS 14.25 dia., 18" pitch prop. Engine runs good, just wondering about the prop, which I feel isn't that aggressive, or if my engine isn't reving high enough. Looking for suggestions

 

[Bondo]

Ayuh,.... Welcome Aboard,..... The answer is in this quote,....

Here is a list of possible causes of low WOT (Wide Open Throttle) rpm.

In no particular order

Engine Won't Reach Operating RPM. Check

1. Fuel condition. Type and Octane possibly old fuel
2. Propeller pitch or diameter, damaged blades
3. Restricted fuel pickup tube or anti siphon valve Fuel System Test
4. Crankcase oil volume, high oil level can cause aerated oil and lifter collapse
5. Marine growth on hull and outdrive
6. Wrong gear ratio in outdrive
7. Restricted carburetor air intake (clogged flame arrestor)
8. Restricted exhaust system (broken exhaust shutters/flappers) in engine transom shield or drive
9. Poor cylinder compression Compression Test
10. Carburetor defective, or wrong type.
11. Fuel pump pressure and vacuum
12. Boat overloaded, improperly loaded, or improperly trimmed.
13. Engine Overheating
14. Engine timing and ignition system operation
15. Remote control cables and linkage for proper travel to open throttle plates fully.

 

[jerryjerry05]

What prop came with the boat?
Sounds like someone's change to a hole shot prop??
Pulling knee boarders or skiers, wakeboards??
You owned the boat since new?
Compression test?