2003 Bombardier Outlander 400 Factory Service Manual, Page 137Get this manual
Subsection 09
Section 03 ENGINE (CYLINDER AND HEAD)
Remove one piston circlip no43 and discard it
R400motr96A
1Measuring perpendicularly (90) to piston pin A8 mm (.315 in)
The measured dimension should be as described in the following tableIf not, replace pistonR400motr94A
1Piston circlip
PISTON MEASUREMENT NEW NOMINAL 90.950 to 90.966 mm (3.5807 to 3.5813 in)
NOTE: The removal of both piston circlips is not necessary to remove piston pinPush piston pin no44 out of piston
PistonCylinder Clearance Adjust and lock micrometer to the piston dimension1