just taken the old plugs out to see that the outside cylinders had CR9E plugs in and the inner cylinders had CR8E plugs in.
What would be the reason for this and should I just go with the standard CR8E.
The bike hasn't run yet, I'm nearly there, but it looks all standard and was told the mileage is a genuine 11115km.
It isn't a track bike and I won't be doing big mileage/long rides on it

Fit the 8 or the 9 but its better not to mix them. The bike would still run though.
I use the twin electrode plug cr8ek

Opps , ref revised

Cr9ek twin prong. Not a fan of iridium plugs.