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half the speed i should be getting

M

mtsontakis87

Guest
hey guys ,

i have a 2004 5.0 mercruiser and today i took my boat out and i tried to open it up and it would only go 20 mph top ....and i usually get 35 mph as a top speed .....i have no idea what the problem could be, any help would be greatly appreciated
 
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.

Above copied nd pasted from another website Don s is the author.
 
yea i already checked that out ...but based on the amount of throttle im giving it the rpm where they are supposed to be but the boat just isnt moving as fast as it should be... any other suggestions ..idea???
 
thanks for your input guys...i thought it had something to do with the prop also. im gonna try and take a look tomorrow after diving into new yorks merky waters
 
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