11. CRANKSCASE/CRANKSHAFT/ BALANCE SHAFT ATV 150/125 Remove the crankshaft and cam chain from the left crankcase. Gasket Clean off all gasket material from the crankcase mating surfaces. Avoid damaging the crankcase mating surfaces. CRANKSHAFT INSPECTION Measure the connecting rod small end I.D. Service Limit: 15.06 mm (0.6024 in) Measure the connecting rod big end side clearance. Service Limit: 0.55 mm (0.022 in) 11-4