2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 8Get this manual
GENERAL INFORMATION IDENTIFICATION NUMBER LOCATION
IDENTIFICATION NUMBER LOCATION
MODEL, PREFIX, SERIAL NUMBER The MODEL, PREFIX and SERIAL NUMBER of the motor are stamped on plate attached to the clamp bracketExample
Serial number plate
Typical pl acement example
ENGINE SERIAL NUMBER second engine serial number plate is pressed into boss on the cylinder block
FUEL AND OIL
Gasoline Recommendation
Bombardier highly recommends that you use alcohol-free unleaded gasoline with minimum pump octane rating of 87 (R+Mmethod) or 91 (Research method)However, blends of unleaded gasoline and alcohol with equivalent octane content may be usedAllowable maximum blend of single additive (not combination): Methanol10 Ethanol, 15 MTBE