On the carbureted side of the range, the 1990 G5 Sun Classic carries model code G5AF and is served by Yamaha service manual LIT-11616-07-10.
The book covers 1990 through 1995. Its pages address the later carbureted cars, listed by Yamaha as G5-AG, G5-AH, G5-AJ, G5-AK and G5-AM, as well as the 36-volt DC-motor G5-EF, G5-EG and G5-EH machines, so it stands as the reference for the family rather than for one season.
For a petrol car the engine chapters carry the detail that matters: carburetor service and adjustment, valve and cylinder work, clearances, service limits and torque figures given at the step where they apply. Chassis, brake, steering and electrical sections follow the same pattern, with the wiring diagram and the factory troubleshooting charts included for fault-finding.
