Read the 1st page but not sure what you are trying to point out?
From my bike prep notes.
Done: Starter: 1.63 lbs
Done: Starter drive gears: 1.05 lbs
Done: Tank mount bracket: 0.39 pounds with the 4 bolts <-- needs reinforcement though
Done: Starter switch and harness to right side rad mount 0.11 lbs
Done: Boil off vent hose, tank to under bike, 0.15 lbs
Done: Head light assembly 1.45 pounds
Done: Reflectors: 0.72 pounds
Done: Trip computer assembly: 0.88 pounds
Done: Battery: 4.60 pounds
Done: Snorkel: 0.46 pounds, with screws
Done: Starter relay, cables, isolator rubber, other relays, etc. 0.88 pounds.
Done: Boil off bottle and connector hose: 0.52 pounds
Done: Battery tray, boil off bottle fender plastic, ECM rubber isolator: 0.44 pounds
Done: Breather reduction of starter port. 0.13 pounds gross, about 0.12 pounds net
Done: Throttle body harness holder. 0.06 pounds
Total 13.44 pounds. 260 - 13.44 = 246.56 pounds, dry.
- speedo drive 0.55 pounds, 0.45 pounds net
- radiator louvres, 0.3 pounds each, 0.6 pounds total
- regulator mount, 0.13 pounds
- kick stand 1.16 pounds, plus lighter left footpeg mount
Total: 2.36 pounds
246.56 - 2.36 = 244.20 pounds
- starter clutch and gear, hoping for 1.5 pounds, lighter flywheel as well
- muffler, hoping for 2.5 pounds
- Titanium shock spring, hoping for 1.25 pounds
- Aluminum rear sprocket, nearly 2 pounds
- newer YZ swingarm 2.5 pounds
Total = 9.75 pounds.
244.20 - 9.75 = 234.45
This is without handguards, rad guards and rad braces.
There are other weight reduction possibilities too. I bet one could get a WR450 down to 230 pounds dry, a loss of 30 pounds.
By dry, I mean with an empty fuel tank but otherwise ready to ride.
I'll write this up in detail in a thread if there is interest. I took pictures of everything as I did it.
You've done your home work, and work to boot. Why did you go this route and not just start from the Yz platform?