2004 SR Johnson 2 Stroke 9.9, 15, 25, 30 HP Outboards Service Manual, Page 14Get this manual
INTRODUCTION ENGINE EMISSIONS INFORMATION
ENGINE EMISSIONS INFORMATION
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any marine 51 (spark ignition) engine repair establishment or individual
Tampering with the fuel system to change horsepower or modify emission levels beyond factory settings or specifications will void the product warranty
EPA Emission Regulations