Hey hey, finally somebody asks about my backyard.
1. Are you taking Hwy 50 to WFO or coming across some other route (I-80, etc)? Hwy 50 is a great road that does allow you to stretch your legs when traversing the valley floors while taking some high speed sweepers across the mountain passes.
2. I'm at a loss as to why Warm Springs is even on the map. I'd be surprised to hear that the handful of buildings there have phones.
3. Even though it is Nevada, not everything is legal. Watch yourself on Hwy 95 from Reno to Tonopah. If you keep it no greater than ten over and wave at the LEO, you'll usually get a wave back and not a light show. Tonopah is where the Nye Co. Police Dept. is based and they regularly set up speed traps in Tonopah on Hwy 95 and on Hwy 6 as it exits town to the east.
4. Hwy 6/375 from Tonopah to Ash Springs in late July will be a toasty ride. Be sure to drink a ton of water. Even mild hyponatremia with dehydration can affect your level of alertness causing altered judgement and sudden unwanted changes in velocity. I will second the cow issue. There are many, many, many cows out there. No farms until you get closer to Rachel, but many cows. I think they monitor the area for the government. These cattle are used to the Hwy, don't move even if you get off your motorcycle and smack them in the ass (do this from the side, not from behind the cow), and there are no fences (hence, open range).
Stop in Rachel. If not for food, at least for a beverage and to cool off. Hwy 93 from Ash Springs through Caliente and on up to Great Basin National Park offers some scenery that is pleasing. It's not your classic motorcycle joyride though. Fuel is available in Ash Springs, Caliente, and in Baker UT (outside of Great Basin National Park). The fuel stop in Baker has no attendant or other conveniences. It's basically just a couple of pumps and a large gravel parking lot on the south side of town. There is also a nice mom and pop resturaunt at the intersection of Hwy 93 and Hwy 6/50 that makes a nice greasy spoon stop. Baker has a small supply store with hot food, but the hours are limited. Take the time to visit Lehman Caves at Great Basin if you can. It'll cool you off. You can also drive up above 9,000ft at Great Basin to cool off as well. There is no park entrance fee at Great Basin (but there is a nominal tour fee for the caves).
Nevada's paved roads are usually in pretty good shape. Almost every paved road is on the map. The "backroads" are usually gravel/rock. Great if you own a R1200GS. Not so great for your FJR.
5. You will leave cell phone service areas. Unless you have a satellite phone, you could be S.O.L. if you breakdown in rural NV. Be prepared for a breakdown and it won't happen. Forget to inspect your bike when you leave Reno and when you leave Tonopah and you'll certainly have problems. You're tires will get hot. Not warm, but HOT. Watch for adverse issues related to this.
6. If you need it, there is a Yamaha dealer in Tonopah. It's called Nevada West Cycles 325 Main St, Tonopah, NV 89049 (775) 482-6943. They're not really experienced on FJR repair, but can help you out if you're in a pinch. Most of their service dept demand is on ATV's and dirt bikes.
I hope that this helps.