Wide Open Throttle RPMs

[Floydy]

Hello,

I have a new to me 2020 Mercury 60 ELPT Command Thrust outboard fitted to a Lowe 20' Pontoon. Took it out yesterday for the first time. With the forward control pushed fully open the RPM gauge showed 4,000. The specs for this motor show wide open throttle is 5500 to 6000 RPM. The boat did feel a little underpowered at full forward. Is it possible this is an adjustment issue with the control cables? Is this a normal adjustment item?

Thanks in advance.

 

[jimmbo]

Welcome to iboats
4000 is low for WOT, and can be caused by many things. Check to see if the Carbs(Throttle Valves if Fuel Injected) do open fully at Full Throttle.
Is it firing on all Cylinders?
What are the Compression Numbers for all Cylinders?
If the engine Checks out Mechanically, and Ignition and Fuel are working, then it might just be a case of the Too Much Propeller

 

[Floydy]

Welcome to iboats
4000 is low for WOT, and can be caused by many things. Check to see if the Carbs(Throttle Valves if Fuel Injected) do open fully at Full Throttle.
Is it firing on all Cylinders?
What are the Compression Numbers for all Cylinders?
If the engine Checks out Mechanically, and Ignition and Fuel are working, then it might just be a case of the Too Much Propeller

I think its firing on all 4 based on how smooth it starts, idles, runs etc.. The motor is basically new. It shows 70 hours and looks brand new. Prob a dumb question but how do you know if the throttles are fully opening? They seem pretty buried under engine covers, etc. Is there a simpler way than disassembly? I'm told the prop is the standard prop shipped by Lowe from the factory.

 

[jimmbo]

The Best way to see if the Throttle Plates are opening, is to look down the Throttle Bodies. I am not familiar with your engine, so it might involve a lot of Parts removal to get a Look down the Carbs, then again, it might not.

Start with a Compression Test. Check to see of it has Spark that can jump 3/8" Gap, on all Cylinders.

 

[QBhoy]

Sounds more like a prop issue to me…if all else is healthy. Do the revs increase if you trim out a little more…even to the point of venting the prop ? Trimming can make a huge gain in rpm.

 

[harmanoff]

Prop Size?