165 Merc will not go to WOT (stays at 2700RPM)

[lenny2113]

Good day fellows,
Prop has been changed from 21 to 19 pitch
Compression tested (120)
Engine runs fine, but will not go past 2,700RPM.

What is next?

Thanks

 

[jerryjerry05]

Re: 165 Merc will not go to WOT (stays at 2700RPM)

Fuel filter,Fuel filter in the pump/fuel pick-up in the tank.The timing/dwell needs adjusting. Linkage? Jerry

 

[Don S]

Re: 165 Merc will not go to WOT (stays at 2700RPM)

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.

 

[lenny2113]

Re: 165 Merc will not go to WOT (stays at 2700RPM)

Super Super !!! Don, I thank you kindly !
Lenny

 

[hoot]

Re: 165 Merc will not go to WOT (stays at 2700RPM)

ignition coil breaking down...