Thanks! Yes, the RF650 is a little bit overkill. But, I like overkill on items like that.
I live in a very arid climate, and it’s possible to go up to 4 years between flushes, but I still stay with a two year interval.
I have never had such low chain wear on my old 6th gen or on my current CBR600RR, 20k miles and the chains would be done, though I do pay attention to adjustments and lube.
Despite everything being well within spec on the 8th gen OEM chain and sprockets, I just felt it would be prudent to change them out before the season really kicks off here. I’ve seen the results of failed chains, and want no part of that.
Same with the spark plugs, the old ones looked great, but I hate to push intervals on items that can drop ceramic bits into a cylinder.