I wouldn't even approach Death Valley in the summer. It's grueling wind-burn heat on a bike where the highs get close to 130 at times and the pavement cooks the glues off the soles off your shoes. The mentioned tip to "stay up high" is good and Tioga Pass (Hwy. 120) through Yosemite is far nicer, just the RV caravans can be a bit of an ordeal but maybe with the high gas costs they won't be as plentiful either. I'd swing through the Yosemite Valley floor too and check out the museum and eats there too. Lots of tourists there. Waterfalls may be dried up or minimal though that late.
Any of the valley floor areas will be over 100 degrees which sort of sucks on a bike in July/August. I would shoot for late May/June personally as the passes are just being snow cleared and opening by then. For late summer, if you leave early AM (4-5AM) and plan on parking the bike by 12 noon it isn't a bad way to travel. Some summer sunrises can be very comfortable and quite relaxing on the road. By 2-8PM it's not so much fun (HOT!). Temp swings are often 30 degrees so if the high forecast is 100, then it is usually about 70 in the early AM. I'm done in full gear at about 90 degrees now. I use phase-change vest packs above that temperature that I can recharge in the motel room refrigerator to stay cool for about 2 hours of heat.
Might want to try and beg, borrow, or rent your gear. We were going to ship our gear to Dublin, Ireland once for a motorcycle rental trip as our carry-ons were full of clothing and electronics, but the shipping costs both ways just for the cycle gear was about $1,100 and probably far more now. Sort of pinched that idea.
I think the summertime travel key is to stay at the higher altitudes and avoid the valleys after noon. About 3 degrees less for every 1000 feet was the rule of thumb for pilots. Tioga Pass is around 9,000+ feet as are most Sierra Passes.
Lassen Park (No. California) is nice too in late summer and not too crowded as it is little known to non-bikers. The west side of the Park is Hwy 36 known for the twistys to the Pacific Coast, but it gets miserably hot too (i.e. Peanut, CA was a hot spot for me, more like melting hot where I needed sacks of ice.). The Hwy 96 running parallel to a gold-enriched river, and Bigfoot's home ground with statues of him everywhere, is a nice ride and the road is well maintained and a bit cooler than 36 at that time of year.
As far as motels, the cheap end of the scale is the Motel 6 and Super 8 as second ($50-$80 incl. taxes.). The mid-ranges are usually the Best Western's and Holiday Inns/Express ($90-$140). The Hampton Inns and Radison Inns are a bit more ($130-$200). Anything with the name "Resort" at the end of it are usually very high ($300-$2,000/night.). National Park lodges are usually high too. If you can call ahead and tell them "You are on a motorcycle and baking from the heat," most will fit you in earlier than their normal 2-3PM check-in and at a ground level floor near the bike which helps. Some motels will give you a "wash-the-bike towel" if you ask. Don't use their guest towels else the maid and management will have a fit (damhik either...opps!). Some (Hampton Inns) may give you a "puck" (plywood square) to keep from poking a kickstand hole in their asphalt too if it's a new place and it's hot enough they know the outcome if they don't. A handy item to carry is a small 3-into-1 AC power plug/outlet if you have a lot of stuff that needs charging as some places are sort of stingy on electrical outlets with maybe one free one for the maid's vacuum cleaner for the entire room.
On the lodging, most will do online bookings and some offer a cheaper rate if you do it that way and do it 8 days out. If you cancel before 24 hours, you may not get charged. Cancel within 24 hours and they may charge you full or some reduced rate. Most all offer online connections either wireless or via a Ethernet cable you can usually get a 25 foot one at the front desk if they use Ethernet. Most are free internet, but I see some of the cheaper ones are now charging an additional rate to connect (~$5). On meal, the ones less than $100/night usually are cold meals and prepackaged. Some have a toaster for bagels. The ones over $100 usually have some sort of hot meal buffet. Most all have a laundry service (pay washer and dryer, just that you may need your own soap.). The Friday & Saturday night rates are often 1.5x-2x the weekday rates too.
I'll add, try and find a place on the maps not located too close to a bar, unless you don't mind the 2AM drunks finding it amusing to flip your bike upside down on the handlebars and/or pissing on it.
Oh, an interesting stop to your list as I see it not listed on many lists: Virginia City, NV. Usually a lot of bikes are there in the summer. Some Reno biker events are around then, maybe the "Busa Nationals" and some dirt biker event. The Reno "Street Vibrations" is the largest but in Sept. I think. Virginia City has a lot of old "pubs & eats" there too along with their "haunted" hotels which are mostly just creaky buildings although I stayed in one where the toilet would self-flush all night for some damn reason (Ghost had the trots I guess?). Lots of history in the old mining town of the likes of Calamity Jane and Mark Twain. Might want to stay the night there vs. Reno or Carson City, NV if you are in the vicinity. The cat houses 15 minutes east of Reno have free tours, tips encouraged I'm sure, and one has a cheap restaurant in it and one just added some huge motocross jump track outside it (Mustang Ranch). The "working girls" will try and get into your wallet on a free tour of the joint, but the stories, band tour buses, and celebrities there will make your head spin (people with way too much money to blow) and the local sheriff hides outside and tries to bust you if you've imbibed (they warn you of it too!). Don't get hit by a drunk in Las Vegas though as it is a very rough area for motorcyclists and partying kids will try an play chicken with you at times.
Sorry for the length. Have fun, dodge the deep potholes, and let's see the pics when done.