2008 Honda Aquatrax ARX1500T3/T3D factory service manual, Page 254Get this manual
CYLINDER HEADIVALVE
CYLINDER COMPRESSION
Start the engine according to the flushing procedure (page 5-3) and warm for several minutes at idleTurn off the water and stop the engineRemove all the direct ignition coils and spark plugs (page 4-61, Remove the seat (page 3-5) and disconnect the fuel pump 5P (Gray) connectorFUEL PUMP 5P (Gray) CONNECTOR
Install the compression gauge into the spark plug holeTOOL: Compression gauge attachment 07RMJ-MY50100 or equivalent commercially available in U.S.A(Snapon, EEPV308A)
COMPRESSION GAUGE
To avoid discharging the battery, do not operate the starter motor for more than seconds