Hi all, could anyone help me understand why my plug is burning a certain pattern? It is whitish at the electrode base, dark at the electrode tip and mostly dark on the base ring. So it seems as if it is rich at some stages and lean at others, but I am at a loss to understand it.
This is for a Vortex Mini Rok 60cc engine running at a high speed, power track. The kart has good pace and RPMs but we seem to loose a little on top end relative to the rest of the field, especially later in the race. This should imply we are a little lean, but my understanding is that when the electrode tip is dark, the main jet is rich if anything.
Thanks in advance!