Call a local Generac authorized dealer. Give them the serial number (located on the data plate of your generator). They may email you a PDF from their internal archive.
Behind the control panel is a potentiometer for fine-tuning output voltage. The manual shows exactly which screw to turn (and how far) if your generator is producing 140V instead of 120V. Generac Vt 2000 Generator Manual Ibbib
: A compact 3.6-liter fuel tank supports up to 8 hours of operation at a 50% load, making it ideal for overnight backup or full-day outdoor events. Call a local Generac authorized dealer
The Generac VT 2000 is a portable generator typically powered by a 196cc Generac OHV engine. It is designed for: Generac Vt 2000 Generator Manual Ibbib
"Generac VT 2000" manual