Lock ring is expanded just enough to go over end of pin. Other means of installing may over-expand ring and possibly crack it. Make sure ring groove is clean and that ring seats firmly in groove.

A lock ring incorrectly installed will soon loosen in service and finally come off pin, resulting in both piston and cylinder being damaged beyond repair. Never install a used lock ring or a new one that has been installed and then removed. Always use an unused lock ring.

Figure 3C-14. Inserting Piston Pin Lock Ring

Lubricate cylinder walls, pistons, pins and rod bushings with engine oil. Rotate rings until gaps are equidistant around rear piston. Turn engine until crank pin is at bottom center. Install new cylinder base gasket. Position Piston Inserter Ring Tool, Part No. 96333-51 on rear piston and slip rear cylinder down over piston as shown in Fig. 3C-15.

Install lock washers and nuts and pull them down evenly. Repeat process to assemble front cylinder.

Assemble cylinder heads and remaining portions of motorcycle as indicated in "Assembling Cylinder Heads," Section 3B, and reverse order of "Stripping Motorcycle for Engine Repair," Section , steps 10 through 1.

Figure 3C-15. Slipping Cylinder over Piston
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