VIOLA, you now have 2 half bikes!
While I had it apart, I applied heat tape to the inside of the frame/tank. Not sure if it will help, but it can't hurt anything.
Remove the stator puck and plug, this is how you will rotate the engine.
Then, remove the heads and start the valve check/adjustment per the manual.
Loosen the plugs, but leave them in place as this will prevent you from accidentally dropping anything into the engine.
I had good luck using a magnet tool to remove and replace the shims. Wipe them off with a rag first to remove the oil "seal" that holds them in place and they come right out. Measure with a micrometer or a caliper to get proper size of the old, and replace with the new using the formula in manual.
All of mine were on the edge of in spec tight, or out of spec tight.
Now they are all in spec mid to loose.