The electric cut-off conversion is very simple to install and sits neatly next to the fuel filler box where the vacuum unit used to be.
I got the idea from this web site:
(I hope it is alright if I mention a fellow HondaBBS albeit Valkyrie)
You can search there for petcock conversion and get all the details. I do not have access to my bike database from here otherwise I would give you all the nuts and bolts needed for the conversion (truely not many pieces).
Total cost was close to US$30.00-$50.00 (can't remember for sure but it was a lot cheaper than getting the new one fixed). This includes thecopper fuel linefittings. No rubberfuel line changes needed and you end up with a few extra hose connections.
If you do not already have an auxillary electricalcircuit setup on the bike you would have to install a relay somewhere hooked upto the auxillary fuse circuitso that may add a little to the cost. (You'll need relay and 5 amp fuse and a little wire - See Rudy's writeup on auxillary wiring).
Since this topic keepscoming up I am going to have to figure out how to take pictures and show everyone just how clean this install looks. The only thing you have to remember is to plug-off the vacuum line that went to the fuel petcock in the first placeonce you get the new electric oneinstalled.
One advantage to this new systemthat no one mentions is thatif you hook this up to a switch itmakes a very good security device as well.When it is shut-off no fuel gets to the engine and the fuel in the carbs is just enough to get the thievesabout 2-blocks down the road. Don't ask me how I know.
I hope this help even a little bit. I have really enjoyed this system and the added security it brings to my ride.