235
POWERHEAD
CYLINDER BLOCK CLEANING
11
Remove and inspect crankcase seal rings. Iden-
tify each ring for installation in original location.
Remove center main bearings and split sleeves
for inspection. Do not mix parts. Note location of
bearings for reassembly.
CYLINDER BLOCK
CLEANING
IMPORTANT: Before inspecting or assembling
powerhead, all internal components must be com-
pletely 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 rigid, medium grit cylinder hone to resurface
walls. Use slow RPM for best oil retention and ring
sealing. When finished, a cross hatch pattern of
22 to 32° should be visible in the cylinder wall.
The pattern should be uniform in both directions.
IMPORTANT: To avoid piston or cylinder block
damage, restore the chamfer to all port edges
using a ball hone or other suitable tool.
49069
24381
1. Crosshatch pattern in cylinder wall
2. Chamfered port edge
002067
2
1
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