no power

[Sturge]

Have a 1983 sea ray with 260 mercruiser can not get on plain. Have checked bottom for build up, clean. Was told motor should run at about 3800 to 4000 rpm at full throttle only running at 3200 - 3300. Any Ideas??

 

[hullofalottatrouble]

Re: no power

done a compression test?

boat super water logged?

when was last tune up?

I assume it used to get on plane and hit recommened WOT RPMs at some point but doesn't now?

 

[Don S]

Re: no power

List of possible causes of low WOT.

Engine Won't Reach Operating RPM. Check

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