Polaris TRAIL BOSS 325 2001 Manual page 226

TRANSMISSION
TRANSMISSION DISASSEMBLY, CONT.
20. Stretch chain tight on a flat surface and measure the
length of 8 pitches in a minimum of three places on
chain. Replace chain if measurement is longer than
3.0904I.
Chain Stretch Limit
8 pitch length = 3.0904I Maximum
8.8
Measure
8 pitches