1991 Yamaha G5-AG "SUN CLASSIC" (CARB) Service and Repair...
Code G5AG, 1991, carbureted: that is the G5-AG Sun Classic, and Yamaha's service manual for it is LIT-11616-07-10.
Because the book spans 1990 through 1995 and covers the whole G5 family, its procedures apply equally to the neighbouring carbureted cars and to the 36-volt DC-motor variants, with variant-specific notes where they are needed.
Working from it, an owner gets the factory's clearances and torque figures instead of guesses, a wiring diagram drawn from the car as built instead of a generic circuit, and a diagnostic sequence that tests in a sensible order. Engine and carburetor work, drive and brake service, steering and suspension are all present with removal and reassembly steps. On a car this age, having Yamaha's service limits to hand is often the difference between reusing a part and replacing it unnecessarily.