2007 Arctic Cat ATVs 400/500/650/700 Service Manual, Page 204Get this manual
3Apply liberal amount of engine oil to the crankshaft bearingUsing propane torch, heat the bearing until the oil begins to smoke; then slide the crankshaft assembly into place
NOTE: It will be necessary to rotate the crank balancer until the counterweight is facing away from the crankshaft; then rotate the crankshaft clockwise into the journal area to allow the crank balancer to be fully seated
5Place the key into the crank balancer keyway; then install the crank balancer gear making sure the alignment dots on the crank balancer gear and the crankshaft gear align