Service Manual

Cylinder and Piston Inspection

1. Inspect the cylinder, piston, and piston ring(s) for

wear and damage. Refer to the specifications

and tolerances in Part 1 - General Information.

Replace the cylinder, piston, or piston ring(s) if

necessary.

2. Install the piston ring(s) into the ring groove(s) in

piston, and check the side clearance of piston

ring(s). The maximum side clearance is

0.004 inch (0.101 mm). Replace the ring(s) and

piston if necessary.

NOTE: Units with one (1 ) piston ring have a piston

ring width of 0.060 inch (1.6 mm) minimum.

Units with two (2) piston rings have a piston ring

width of 0.047 inch (1.14 mm) minimum.

3. Inspect the ring groove(s) on piston for carbon

deposits. Clean the ring groove(s) thoroughly.

Crankshaft and Crankcase Disassembly

NOTE: Crankcase disassembly and reassembly

requires the use of an arbor press and suitable drift

punches and bearing supports. If these are not

available, do not attempt to repair the crankcase

assembly. Refer to the appropriate parts manual to

order a complete crankcase/crankshaft assembly.

1. Using an arbor press, press the crankshaft and

thrust washer out of the crankcase.

2.6071.074

2.6078.090

2.6071.073

ENGINE (cont.)

DISASSEMBLY, INSPECTION, & REPAIR

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