I bought the Excel 2600 a couple of years ago.
Is the problem a leak at the power hose connection?
What I discovered is when you remove the power hose, the small O-ring washer that is supposed to remain in the fitting comes flying out. I didn't notice this was happening. On next use, there is a huge leak to the extent that there isn't enough water pressure to operate the machine.

Once I found the right size washer, I bought a dozen and also carefully remove the power hose now, cupping my hand around the fitting to catch the washer. It can be worked back into place with a small flathead.

The only other shortcoming I've found is that the Honda really drinks the gas but, that may really be related to the small tank.

Honda motors are rated pretty good.
Arent the 'Excel parts a frame, a couple of wheels, a hose, a gun and some nozzles?

What issues do I have to look forward to?

 

I recently purchased the DeVilbiss 2600 with a Honda engine for $298 at Sam's. I was going to have to rent one to wash down the deck before restaining so it has paid for itself already. I don't think I will use it on vehicles though, I might pull a Mountaineer/Tritoneer/Mattineer. Don't think I could live with the shame if I did that.

 

just don't get hard on the paint you should be fine. i didn't have a problem with the paint, it was just the trim paint on the tailight and my Pin stripe on the door that blew off, but other then that, it went good

 

I bought the same and I have had no problems. Now that I said that though we will see.
I assume the pump will fail long before the engine.