That's really nice of you Jim. Thank you!!!
Dealing with this old bike makes me feel a little bit like a detective. Seeing the evidence left over by the "perpetrators", and trying to figure out what happened.
Was someone looking to improve performance? I assume that's why the top of the airbox was cut open. Then there's the jets that were installed that were all too small. Why did that happen? Maybe the bike wouldn't start after sitting, and the shop used a carb kit from a 750 because that's what they had on the shelf? Maybe after the carbs were "rebuilt" using the wrong parts, someone was trying to fix a lean-condition? There is also sealant on the seal on the end of the throttle shaft. So the bike was super-lean, then they tried to fix air leaks, then chopped the piston spring trying to get more fuel?
It looks like there are some "jet kits" that include instructions to modify the piston spring. Maybe someone got a hold of a kit for the wrong type of bike and just installed it?
Who knows. The bike has only done 240 miles a year since it was built. Obviously, it sat for long periods of time. I'm really looking forward to getting her on the road soon and breaking the cycle of neglect.
Thanks for the help in untwisting the mystery