spark colour

[kawaguy]

hi there guys, i have a 1999 kx125 and was wondering what colour the spark should be, not the colour of the plug but the spark, should it be orange or blue or both, and also should the spark be jumping the gap on the plug or dancing around the electrode, how big should the spark be, the plug is a BR9EIX ngk iridium plug, are they any good.
any help will be appreciated.

 

[Crash217]

spark should be blue... "jumping the gap" its a good plug.