The thing to remember is that Factory Warranties cover defects in materials and workmanship; they don't cover wear and tear. Defects will usually show up early in a product's life.
Overall warranties are the norm for smaller, consumer-grade units. Those will usually be a year or sometimes two. As you move up into commercial units the component warranties take over, like 3 years on Honda GX engines (so you would contact Honda for warranty issues), 2 years on the CAT pump (so you would contact CAT Pumps for warranty issues, and a lifetime frame warranty (you would contact Pressure-Pro for warranty issues).
The 90 day overall Factory Warranty is how long Pressure-Pro will be responsible for all the other bits- hoses, guns, nozzles, tires, etc.