133
POWERHEAD
CLEANING
7
Use Retaining Ring Pliers or equivalent to
remove wrist pin retaining rings. Discard the rings.
The fit between the wrist pin to bosses of the pis-
ton is loose on both sides. Push the wrist pin
through to free the piston from the connecting rod.
If necessary, use Wrist Pin Pressing Pin,
P/N 392511 and press out the wrist pin using an
arbor press. Be careful not to lose any of the 22
needle bearings or the two wrist pin washers. If
any of the bearings are worn or lost, replace all
the bearings on reassembly.
CLEANING
IMPORTANT: Before inspecting or assembling
powerhead, all internal components must be per-
fectly clean and free of contaminants.
Remove any carbon accumulation from exhaust
port areas.
Remove any carbon accumulation from cylinder
head combustion chambers.
If cylinder walls are glazed from extended use,
use a medium grit hone to resurface walls. Use
slow RPM to achieve a strong "crosshatch" pat-
tern for best oil retention and ring sealing.
COB1129
COB1130
CAUTION
To avoid piston or cylinder block damage,
restore the chamfer to all port edges using
a ball hone or other suitable tool.
WARNING
To avoid personal injury, wear eye protec-
tion and rubber gloves when using Gel
Seal and Gasket Remover.
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