2006 Johnson SD 3.5 HP 2 Stroke Outboard Service Manual, PN 5006562, 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 81 (spark ignition) engine repair establishment or individual
The owneroperator is not to, and should not allow anyone to, modify the outboard in any manner that would alter the horsepower or allow emissions levels to exceed their predetermined factory specificationsTampering with the fuel system to change horsepower or modify emission levels beyond factory settings or specifications will void the product warranty
Manufacturer'S Responsibility