11.CRANKSCASE/CRANKSHAFT/ BALANCE SHAFT ATV 300/250 Mark (Crankshaft) CRANKCASE/BALANCER INSTALLATION Install the balance shaft and crankshaft into the left crankcase. Align the mark on the balance shaft with the mark on the crankshaft. Install the dowel pins and new gasket. Install the right crankcase and tighten the crankcase attach bolts. Mark (Balancer) Install the timing chain. 11-6