1985-1986 Honda ATC250R Shop Manual, Page 120Get this manual
TRANSM ISSIONCRAN KSHAFT BALANCER
INSPECTION
Measure the crankshaft runout at the points indicated in the photograph
SERVICE LIMIT: 0.05 mm (0.002 in)
Replace the crankshaft if the runout is larger than the service limit
24 mm (0.95 in)
60mm (2.36 in)