The California emissions system is detailed starting on page 1-25 of the Honda service manual. Basically the system included a charcoal canister to absorb fuel vapors from the tank vent and carburetor vents plus associated tubing and valves that control purging the canister. The second part is the secondary air supply system, which introduces filtered air into the exhaust ports to burn unburned hydrocarbons. Neither system affects performance, but can cause problems if any of the many rubber tubes develop leaks. There is also a small amount of weight to be saved by removing all components and blocking off all disconnected ports.
-Bill
Exactly this.
In the meantime I have moved on to more modern bikes, and actually it's quite nice heading out to the garage in warm weather and it doesn't smell like evaporated gas.
No need to remove any of that stuff unless it's actually giving you trouble, IMHO.
