2006-2009 Suzuki LT-Z50 QuadSport ATV Factory Service Manual, Page 28Get this manual
PERIODIC MAINTENANCE
Count out 21 pins (20-pitch) on the chain and measure the distance between the two pointsIf the distance exceeds the service limit, the chain must be replacedDrive chain 20-pitch length: Service limit: 259.0 mm (10.20 in)