2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 146Get this manual
POWER UNIT CYLINDERCRANKSHAFTPISTON
Fitting Conrod to Piston
Install: Piston CD (with piston rings) Conrad (2) Piston pin Circlip (Qty2)
I ACAUTION I
Do not re-use circlip removedBe sure to use new circlip
Reassemble each piston, piston pin and conrad to their original positionReinstall the conrad to the original direction
Installing Piston and CrankshaftCrankcase
Install: Pistons (with conrad)
Piston ring compressor