A better choice is to use a EGD or FD rated oil.
NMMA TC-W3 – two cycle water-cooled, third generation. TC-W3 obsoletes TC-W & TC-WII. Oils with this spec do not use metal based additives, and are ashless. This is an outboard specific spec.
API TC – only API spec established for two cycle engines. It regulates lubricity, detergency, ash content & pre-ignition. Oils with this spec are typically using metal based, ash producing additives. (Note: effective at the higher temperatures of air cooled engines)
JASO FA – original spec established regulating lubricity, detergency, initial torque, exhaust smoke and exhaust system blocking.
JASO FB – increased lubricity, detergency, exhaust smoke and exhaust system blocking requirements over FA.
JASO FC – lubricity and initial torque requirements same as FB, however far higher detergency, exhaust smoke and exhaust system blocking requirements over FB.
JASO FD - same as FC with far higher detergency requirement.
ISO-L-EGB – same tests and requirements as JASO FB.
ISO-L-EGC – same tests and slightly higher detergency requirements (piston varnish) as JASO FC.
ISO-L-EGD – same tests and requirements as JASO FD.