The standard 127 mm alternator can be directly driven by many engines from 25 cc to 160 cc. It is rated for 500 watts at low cruise RPM. It can also be belt driven by larger engines.
Wattage range: 500-1500 watt
Engine size range: 80cc to 200cc
Voltage: 10.0 Vac/1000RPM
Single/three phase: Single
Temperature Range: Stator: 160C, Rotar: 66C