Spark plug colour - Mis match

Dennis the Menace

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Not had the bike serviced since the warranty ran out 04 bike. Tend to do things myself. Bike is approaching 30,000 miles, took the plugs out tonight after a run and noticed the two plugs centrally located were a lighter colour than the two plugs off set to centre, which seem to be running darker.:eek:

First time I've had twin spark headed bike. I am assuming that the mis match in colouration is normal. Would somebody like to confirm whether this is correct :thumb
 
Not had the bike serviced since the warranty ran out 04 bike. Tend to do things myself. Bike is approaching 30,000 miles, took the plugs out tonight after a run and noticed the two plugs centrally located were a lighter colour than the two plugs off set to centre, which seem to be running darker.:eek:

First time I've had twin spark headed bike. I am assuming that the mis match in colouration is normal. Would somebody like to confirm whether this is correct :thumb
Mine was similar when i changed the plugs for iridium ones, 04 bike too.
 


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