Powerhead
90-8M0050731 MAY 2011 Page 4A-53
IMPORTANT: The piston ring side with a dot or letter must be facing up.
a - Piston ring
b - Dots
c - Feeler gauge
d - Ring end gap
e - Dot or letter
f - Piston ring
Piston ring end gap
Standard bore
0.25 mm–0.45 mm (0.010 in.–0.018 in.)
Oversize bore
3. Use a piston ring expander and install the piston rings with the dot side up onto the piston.
4. Verify the piston rings rotate in the ring groove.
5. Lubricate the piston and rings with 2‑Cycle Premium Outboard Oil.
a - Piston ring expander
b - Dot side up on piston ring
Piston Ring Expander 91‑24697
Tube Ref No. Description Where Used Part No.
14
2-cycle Premium
Outboard Oil
Piston and cylinder wall 92-858021K01
6. Align the piston ring end gap with the locating pin.
7. Install the piston ring compressor.
Piston Ring Compressor
91‑818773T
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