Today I did a 9.3 mile dirt ride, in 100 degree (F) heat starting and ending at my desert cabin with no problems. I was on my 2012 DS and it preformed flawlessly. I also got to try out my new handlebar mouted momentary switch that puts it into ECO mode and lights the brake light for max regen slowing. It worked well and was very useful on the ride.
A week ago there was a big thunder storm that put major water flows in all of the normally dry washes in the area where my deser cabin is. This provides an opportunity to do legal rides on un-roaded dry wash surfaces. The flows take away any sign of the double track "Jeep" roads that are normally there. But since they are legal routs of travel, in the desert state park, it is like having permission to ride "off trail". I rode up a wash/canyon named "View of the Badlands". A four wheel vehicle had started up the canyon but a new rockfall not far from the entrance had turned them around. I could slalom between the boulders on my bike. from that point on it was "virgin" dirt.
The motor had a pretty good load, even though the gradient wasn't very steep, because the newly deposited soil was sandy and soft in many places. I could feel the rear wheel bogging down often. At a couple of places I parked and did some hiking so the bike had some time to cool down (if that's possible in bright, hot, sun). However, I never had any indication that anything was getting too hot.
The day ended up with a high of 106 so I'm glad I finished my ride at only 100 degrees.
After getting back to my cabin I let the bike "cool" in my garage (not very cool in there) about a half hour before connecting the charger. No problems with the charger either.
See the photo of my solo bike track, about 200 yards from the top end of the canyon. There is usually a well defined double track "Jeep" trail there.
BTW - This ride would have been impossible with the factory tires. My wheels would have been sliding around on the tight turns and no traction on the rear.
Trikester