Before removing the crankshaft, measure the crankshaft end play using the following procedure:

1. Reinstall the lower crankcase.
2. Place a dial indicator at the crankshaft nose.
3. Gently force the crankshaft to the extreme front and rear positions with a pry tool while monitoring the movement of the dial indicator.
4. The crankshaft end play should not exceed 0.5 mm (0.020 in).
5. If the specifications are exceeded inspect the thrust bearing thrust OD and the crankshaft thrust wall for wear and/or excessive runnout.
6. Replace the thrust bearing or crankshaft as necessary.

1. Remove the lower crankcase.



2. Using two hands, lift the crankshaft straight up from the engine block.
3. Place the crankshaft in a secure place.



4. Remove the crankshaft sprocket drive pin (1) from the nose of the crankshaft.

1. Prepare a piece of cardboard, or equivalent, numbered one to five for bearing identification. Main bearing journals are numbered from the front of the engine.
2. Remove the crankshaft upper bearing halves from the cylinder block. Note the position of the thrust bearing (1) at the number three journal (2).
3. Place the crankshaft upper bearing halves on the cardboard in the correct positions. Note that the number three bearing is the thrust bearing.



4. Remove the crankshaft lower bearing halves from the lower crankcase.
5. Place the crankshaft lower bearing halves in the correct positions on the cardboard.