2003 Bombardier Outlander 400 Factory Service Manual, Page 45Get this manual
Subsection 04
Section 02 MAINTENANCE (STORAGEPRESEASON PREPARATION)
STORAGEPRESEASON PREPARATION
STORAGE
If the ATV is to be stored for an extended period of time, more than month, be sure to thoroughly check the vehicle for repairs and have them performed
FUEL STABILIZER
A fuel stabilizer (PN 413 408 600) can be added in the fuel tank to prevent fuel deterioration and avoid draining the fuel system during storageFollow the manufacturer's instructions for proper useIf no stabilizer is used, drain fuel system including the fuel tank and carburetorCAUTION: Fuel stabilizer should be added prior to engine lubrication to protect carburetor against varnish deposits
ENGINE LUBRICATION
Engine internal parts must be lubricated to protect them from rust formation during the storage period