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Piston/Piston Rings/Piston Pin
Servicing Your Honda 81
Piston Installation
1. Place clean shop towels over the crankcase
opening to keep the piston pin clips from
falling into the crankcase.
2. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease containing more than 3% molybdenum
disulfide additive) to the inner surface of the
connecting rod small end.
3. Install the piston (1) with the “
O” mark (2)
and/or the large valve recess (3) facing the
intake side of the engine.
4. Apply engine oil to the piston pin (4) and
inner surface of the piston pin hole.
Install the piston pin and new piston pin clips
(5).
Use new piston pin clips. Never reuse old piston
pin clips.
Do not let the piston pin clips fall into the
crankcase.
Do not align the piston pin clip end gap with the
piston cut-out (6).
NOTICE
(1) piston (4) piston pin
(2) “
O” mark (5) piston pin clip
(3) large valve recess (6) piston cut-out
Cylinder Installation
1. Place clean shop towels over the crankcase
opening to prevent dust or dirt from entering
the engine.
2. Clean off any gasket material from the gasket
surface of the crankcase.
3. Remove the shop towel. Do not let any gasket
debris fall into the crankcase.
4. Install the dowel pins (1) and a new cylinder
gasket (2).
Do not let the dowel pins fall into the crankcase.
NOTICE
(1) dowel pins
(2) cylinder gasket
5. Clean any gasket material off the cylinder.
(1)
(3)
(2)
(1)
(4)
(5)
(2)
(6)
(5)
(2)
(1)
(cont’d)
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