Yes, it was If this engine has the power that my Mega MF12 the MAX Power .12 has, I will get another without question. I know they say to use the Ninja plug, but mine was DOA in the motor...have to call Mugen on that) but I took the caliper and guages out and measured the plug. The are very and do mean very close to the rossi plug. Sorry Mugen, but I didn't have a plug and when I orderd the engine, no plugs available, so in when the Rossi plug.