1. Disconnect the brake cables from the rear brake cam arm, get some penetrating oil and spray around the shaft the arm is on and work it back and forth and try to free it up. It might also be a problem on the brake side, you will need a 41mm wrench to remove the axle nuts to get the brake drum off to access the brakes. I bought a 41mm wrench that goes on a 3/8" breaker bar off eBay to get this accomplished. Just lube it all up and get it moving! It could also be weak brake springs, the springs between the shoes as well as the spring around the cam inside is responsible for the return action of the brakes, you just have to tear it apart and check everything. I got lucky and it was just a bad hand brake cable on mine.
2. I had to replace them on my 84 200ES as well. I bought some rubber heater hose at the local auto parts store, i forget what size i think it was 1/2" for the larger piece from the crankcase to the T and from the T going down the frame, i used the original plastic hose T, then for the upper line that goes up across the frame by the battery i used a short 3 inch piece of the larger size hose then a reducer which has a barbed fitting on both sides and went down to the smaller size, i think that was 3/8". Just use what you can find for hose, its not under a lot of pressure so any rubber tubing will work.
I agree its addictive... I take mine for a spin whenever i need to blow off a little stress.
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1984 Honda ATC200ES "Big Red"
1982 ATC200E "Hondie"
1988 TRX300FW "Project Quad" Still in progress....