Kurt,


This engine can run on this plug, but [link=http://www.os-engines.co.jp/english/line_up/plug/plug.htm]OS recommend[/link] a cold plug for this engine, specifically their own A5.

The #8 is a medium-heat plug and could potentially make your engine run hotter through the verge of detonation, or will need you to run the engine richer than normal to avert this, causing excessive soot that sticks your engine's parts together.