Bad miss on mag check then smooths out.

Roger Lee wrote:

Did you get the engine to smooth out?

Yes, replacing the top spark plug in cylinder #1 solved the problem where the engine would run extremely rough during the mag check when the right mag was turned off. Apparently this particular spark plug would not throw a proper spark until it reached a certain temperature. 

Hi Walt,

That's odd, but a fix is always good.

Walt,

Is this a Rotax part number plug or another brand?