2004 Ski-Doo REV Series Factory Service Manual, Page 64Get this manual
Section 02 MAINTENANCE Subsection 03 (PRESEASON PREPARATION)
THROTTLE BODY CLEANING (ON SO EQUIPPED MODELS)
Remove the throttle body from vehicleUsing the Pulley Flange Cleaner (PN 413 711 809), remove the dirt ejected by the drive belt from the throttle plate and from both throttle body boresAfter throttle body installation, adjust throttle and injection oil cables
SPARK PLUGS
Once preseason preparation is done, start engine with the old spark plug(s) to burn excess storage oilThen, install new properly gapped spark plug(s)
CARBURETOR CLEANING (ON SO EQUIPPED MODELS)
Disassemble carburetor(s) in order to clean all internal partsDo not hesitate to replace any jets having gum or varnish on their surfaces
AIR FILTER CLEANING
Check that inside of air silencer is clean and dry then properly reinstall the filterCAUTION: These snowmobiles have been calibrated with the filter installedOperating the snowmobile without it, may cause engine damage