All fluids, brake, clutch, coolant, oil & filter.
Drain the drool tube (underneath, one tube is plugged)
It seems likely the carbs are gummed up. But start with big doses of Berryman's B12, and run it easy (low rpm) to clean slow jets. Non ethanol polluted gas if possible. Tighten up all the intake runners (they're probably loose).
Make sure the vacuum petcock is working and not leaking (or replace the coverset)
https://www.partzilla.com/product/honda/16953-MBZ-B51 Turn it off every time.
Pull the tank and change the air filter. Do not bugger up the petcock hookup.
Get under the sideovers and clean up the crud under there (the fuzzy brush vacuum attachment is good). Learn to pull them out at the back, and pivot them forward and unclip the front hooks (don't break the tabs off).
No reason to replace wheel bearings if they are not failed. Ask the shop doing your tires to check the bearings for good function.