No pressure in a excel exvrb2321 pressure washer

pretty much any gas powered pressure washer in good repair with a decent nozzle/wand can work on concrete. They have a lot more power than electric ones.

thermal relief valve would be a start. but is the pump actually turning... are you on city water or well water...

What is your model #
http://www.ppe-pressure-washer-parts.com/excell-devilbiss-pressure-washer-replacement-pump-parts

The cause could be 1 of two problems:

1.) The seals are worn out or broken. IF you remove the head of the pump and find the broken seals, they can be replaced with this kit:
http://www.ppe-pressure-washer-parts.com/product/D23514

2.) The ceramic rods that hold the two main straps in place shattered. This is caused by overheating in the pump, if the pressure washer is left of for several minutes without releasing the pressure. If this is the case, parts are available, but can be quite difficult to replace. I'd recommend taking it to a service center in this case.

the carborater may need a dighafram or carborater cleaning of the bowl

Many of the excel units don't come with a pressure relief valve but instead a thermal relief valve, it really depends on the model number of the pressure washer. You should only replace the thermal relief valve if it is leaking.

Excell pressure washers used a series of numbers such as yours. I believe that that number will be for pump or pressure washer as a whole unit. Check Excell web site for a match. If you are looking for the engine model number check the fan shroud or valve cover or tag on engine itself. Good luck

I like http://www.ppe-pressure-washer-parts.com/excell-vr2522-replacement-parts-pump See pump upgrade and compare to rebuilding. Another good site is www.pressure-washer-parts.com. Piston seals usual begin by overheating from excessive idling. You might add a thermostatic relief valve to help this.

What engine is it? The plug gap should be preset, But I'm glad you mentioned the compression, it should be 100 lbs.. , 70 lbs min, or it won't start. You might have a valve burned out from the choke being on. Most engines won't run with the choke on, so something was wrong. You can pull the head and the valves easy enough to see what it is. One more thing, make sure there is nothing holding the engine back from running, like the pressure washer is full and ready to go, let the pressure out if you can. Hope this helps.

should be a honda gcv 160 5,5 horsepower engine.

do a search for honda engine carburretor adjustment, plenty of pages on the internet detailing how to adjust carbs, mixture etc.

Excell Pressure Washer Model VR2522 Replacement Parts repair kits ...
lok at this site , parts breakdown of engine etc