The D shaped intake port means it is a GXV140 clone, which means it is 5.0 advertised horsepower. That should be enough to knock down tall grass very easily, so I suspect you were suffering from clogged grass chute when you did your trial cutting test. The GXV160 is only 5.5 advertised horsepower, not much different. As I think I've said previously, the base engines of the chondas seem to work and last as well as the Hondas they are copied from, if you put aside a couple of minor short-cuts the copiers have taken.
I find the petrol pressure washer a bit of a hassle, because I use it rarely so I drain the fuel after every use. However at 5.5 hp and 2,400 psi, it is in a different league from any of the electric ones that I've seen. The petrol ones are different machines to use, compared with the small electric ones, because the engine keeps running whether you are squirting water or not. This means it has a high-volume bypass built in, to keep the water in the pump from boiling immediately whenever you release the squirt-lever. It also has a secondary safety system: if you leave it running without squirting for several minutes, it will do an emergency dump of hot water from the pump onto the ground, to keep it from cavitating and destroying the pump. It's kind of an industrial-strength machine rather than something you wash the car with. It sure can remove 40 year old crusted black mould from a concrete driveway though, if you don't mind getting plastered with back-blast. I've also found it has a near-miraculous effect on old industrial-type carpet tiles that have gone brownish with trodden-in dirt over a period of years. Once again though, you get seriously coated in crud when you do it.
Like most purchases of machinery, I only bought the washer because it was cheap. The previous tenant bought it and immediately tried to use it for hydraulic mining on a building site. He put the water intake hose in a mud puddle and started squirting a clay cliff, so the pump would pick up the run-off and pump it at the cliff again. Of course the pump intake filter blocked immediately. He tinkered with it a bit then put it on ebay saying that the pump was a total loss but someone could remove the engine and put it on a lawnmower. Opening bid was $25, and I was the only bidder. The spark plug insulator was still glaring white like a glacier - must have run 10 minutes or less I think. It took just a few minutes to clean the pump filter, clean out the nozzle that he'd been shoving into the clay cliff, and then do a new-engine tune up.
