Original GUILERA 4-pin starter relay as original equipment in vehicles. Suitable for Yamaha Neos, Aerox and Rieju. A defective relay is usually the cause of not starting if the battery is charged. The job of a relay is to turn on the battery positive directly to the starter motor. Often, the switching mechanism and the relay must be replaced accordingly. OEM numbers for comparison: 27V-81940-02 020322G 809061 109305 1002213 001.200.6002 001.200.0400