Hi there friends.
From my experience, don't use these on Triumph Sprint bikes.
Just changed the sparks when I did the maintenance of the 40000Km on the dealer and they only managed to run 2000 Km's.
Really **** spark plugs.
They burned out, more than the NGK that I had for the last 20000 Km's.
Got NGK's again and replaced them my self.
Bike now is perfect.
Just made a complain on the dealer...**** sparks on my bike, no way.
The justification was that Denso's are not so expensive.
I told them that I don't care if I spend more 30 or 40 € in good material.
My bike is 40000Km's and rides like new, now problem at all.
They had to change the brand of spraks for me to have the 1st no start of my bike in 10 years...