I have very recently purchased this bike. Was checking plugs and noticed the previous owner has installed NGK DPR7EA-9 instead of the recommended DPR6EA-9. The bike has Cobra exhaust/Cobra fuel processor and Kuryakyn Hypercharger. I have no riding time on this bike yet (weather), I understand this is a colder plug....should this be ok??....anyone shed light on this. Thanks.