Instructions and picture provided by Jason Spradlin, STOC 5043:


NOTE:  The hose with the GREEN X is the main fuel line that goes to the carbs.

Step 1)  Remove completely the hose with the RED X.  
Step 2)  Connect the hose with the GREEN X to the output of the fuel filter.
Step 3)  Remove the cutoff valve
Step 4)  Plug the small vacuum line attached to the fuel cut-off.



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Fuel Shutoff Repair instructions at this link:
http://www.st-riders.net/index.php?topic=1213.msg8136#msg8136

Diaphragm repair kit:
K & L diaphragm repair kit, p/n 18 4356 ( Available at www.casporttouring.com )

Link to kit at California Sport Touring.


Price: $21.98 as of June 2009

Possible alternate sources for rebuild kits as of Feb 2013:

www.partsnmore.com

and

www.carbkitscapital.com

and

www.sudco.com

and

http://www.nrp-carbs.co.uk/index.htm