Crankshaft and Piston Removal

Remove the cam chain (see CAM CHAIN REMOVAL ).
Remove the oil pump (see REMOVAL ).
If you can feel a ridge of metal or hard carbon around the top of any cylinder, remove it with a ridge reamer (A). Follow the reamer manufacturer's instructions. If the ridge is not removed, it may damage the piston as it is pushed out.

Fig 1: Removing Ridge Of Metal Or Hard Carbon Around Top Of Cylinder With Ridge Reamer
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the 8 mm bolts securing the lower block.

Fig 2: Identifying Removal Sequence Of Lower Block Bolts
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the bearing cap bolts. To prevent warpage, unscrew the bolts in sequence 1/3 turn at a time; repeat the sequence until all bolts are loosened.

Fig 3: Identifying Removal Sequence Of Bearing Cap Bolts
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the lower block and bearings. Keep all bearings in order.

Fig 4: Removing Lower Block
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Remove the rod caps and bearings. Keep all caps and bearings in order.
Lift the crankshaft out of the engine, being careful not to damage the journals.

Fig 5: Removing Crankshaft
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Use the wooden handle of a hammer (A) to drive out the pistons (B).

Fig 6: Removing Pistons Using Wooden Handle Of Hammer
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reinstall the connecting rod bearings and caps after removing each piston and connecting rod assembly.
To avoid mix-up on reassembly, mark each piston and connecting rod assembly with its cylinder number.
NOTE: The existing number on the connecting rod does not indicate its position in the engine, it indicates the rod bore size.