POWERHEAD - 4-2990-817643R1 DECEMBER 1996
1. Install piston ring in appropriate groove on piston using
Piston Ring Expander Tool. Spread rings just enough
to slip over piston.
Top Groove – Chromed Ring
Bottom Groove – Steel Ring
2. Check piston rings to be sure they fit freely in groove.
Lubricate rings and cylinder wall with 2-cycle oil.
PE-51081
b
a
a - Piston Ring Expander
b - Piston Rings
3. Align piston ring end gaps with ring locating pins as
shown. Check locating pins making sure they are tight.
PE-51228
PE-51082
a
b
b
a
a
a - Locating Pin
b - Piston Rings
4. Remove connecting rod cap from connecting rod be-
ing installed.
5. Install each piston with “UP” identification facing fly-
wheel end. Pistons MUST be installed in this direction.
UP
!
CAUTION
Pistons must be installed very carefully into cylinders.
Piston rings can not be inspected thru exhaust ports.
6. Bottom end of cylinder bore has taper which permits
the insertion of the piston into block without using a pis-
ton ring compressor. Place piston carefully into cylin-
der.
PE-51087
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