What's the number stamped on the plug?
Champion RA8HC, same as specified in the owner's manual
Are they all the same color, or is one worse than the rest?
They are all the same.
Dry and sooty, or wet and oily?
The top one was dry, the other two were a bit wet with fuel.
Does the temp gauge...
2023 Boston Whaler, 40 HP Mercury 4 Stroke EFI.
I purchased from original owner this spring, motor had 40 hrs at that time. I removed the spark plugs today for inspection and they were all gapped to .026. The owners manual says gap should be .040. Boat was previously serviced by a reputable...
I have used the software. It's not a disc or download, it's a micro SD card. I found it fairly easy to install and use and it did have the correct cable for my DF20A. Instructions for set up are included.
The motor in the video is limiting RPMs because it is in neutral, try putting it in forward gear and revving it.
If it's exhibiting this problem on the water then it might be a fuel problem, are you using fresh gas?
Does anyone have any experience with updating a DF20A to add the power tilt feature? Just wondering if this is feasible and if so where I might obtain parts.
With red light and limp home mode there should be warnings stored in the SDS system. It would be in the "Caution Sys. Info" area of the Service Data Window. It took me a while to find this, it's not particularly intuitive.