2005 Ski-Doo Racing Handbook, Page 395Get this manual
SECTION 082005 MX 550 AND 380 FC
WARNING
Make sure the track is free of particles that could be thrown out while track is rotatingKeep hands, tools, feet and clothing clear of trackEnsure nobody is standing near the vehicleAccelerate the vehicle at low speed (maximum 30 kmh (20 MPH)) and apply the brake, repeat timesRetorque screw to 90 to 100 Nm (66 to 74 lbfft)