2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 11Get this manual
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GENERAL INFORMATION SPECIFICATIONS
11.0 (15) 54006000
POWERHEAD
Engine type Number of cylinders
4-stroke SOHC mm(in) mm(in) 58 .0 (2.28) 57 .0 (2 .24) 302 (18.4)