I was in the same boat as you are now in January. It's been 10 years out of R/C racing myself.
The B4's are simple to work on. Don't need much for tools. I ended up buying Dynamite .050",1/16",2.5", and 3/32" hex drivers. A needle-nose pliers and a regular pliers. I also have a nut driver for the rear wheels.
I hope this will help you out to get started?
Good luck racing and have fun.
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