1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 181Get this manual
2Identify the pistons and cylinders by marking on the tops of the pistons the letters PTO (left side), MAG (right side) or CEN (middle of threecylinder models)In addition, keep each piston together with its pin, bearing and piston rings to avoid confusion during reassembly3Before removing the piston, hold the rod tightly and rock the piston as shown in Figure 46Do not confuse any rocking motion with the normal side-to-side sliding motionRocking indicates wear on the piston pin, needle bearing, piston pin bore or combination of all threeNOTE Wrap clean shop cloth under the piston so the clip will not fall into the crankcaseWARNING Wear safety glasses when peiforming Step 4
cFigure 24: Liquid-cooled 435.8, 437.4, 550, 580 and 594 cc engines dFigure 25: Liquid-cooled 497 and 599 cc engines