1998-2000 Yamaha WaveRunner GP800 Factory Service Manual, Page 142Get this manual
I II:] I ELEe
IGNITION SYSTEM
IGNITION SPARK GAP
WARNING
When checking the spark gap: Do not touch any of the connections of the spark gap tester lead wires Take special care not to let sparks leak out of the removed spark plug cap Keep flammable gas or liquids away since this test can produce sparks1Check: Ignition spark gap Out of specification