2003 Polaris ATV Trail Boss 330 Factory Service Manual, Page 30Get this manual
MAINTENANCE NOTE: The bowl drain screw is located on the bottom left side of the float bowl1Turn fuel valve to the off position2Place clean container beneath the bowl drain spigot or bowl drain hoseRES
Cylinder Compression Standard 70-90 PSI Cylinder Leakage Service Limit: 10 (Inspect for cause if leakage exceeds 10)
ENGINE MOUNTS
Inspect rubber engine mounts for cracks or damageON