2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 351Get this manual
2Using the Crankshaft Installer (pin 0444-018), install the crankshaft 3Install the crank balancer
5Place the bearing C-ring into position in the crankcase; then install the front output shaft and rear shaft assemblies4With the key in position, slide the driven gear onto the crank balancer making sure the timing marks are aligned