1978 Ski-Doo Shop Manual, Page 250Get this manual
SECTION 04 SUB-SECTION 06, (AIR INTAKE SILENCER, FUEL TANK)
RV AND SONIC, BLIZZARD 6500 PLUS
G)At assembly on intake manifold, apply light coat of silicone sealant on rubber flange mating surface
and Sonic
The neck of the air intake silencer must always be turned down and facing the rear (see illustration) otherwise the pressure created by the vehicle speed will lean the mixture and cause engine damage(""