One thing that works well for getting clogged up fuel systems cleaned is
that Sta-bil fuel gas 'storage' stuff.  Learned this from a VW Baja racer
guy.    Use it to keep the gas from going 'flat' in an unused vehicle and
also if you have one with a clogged up system.  It 'dissolves' a lot of the
gummy stuff that gets into carb jets and injectors and other places.  I just
're-fired' a late 80s Honda Hawk moto that was sitting for over 5 years
since my last race...the carbs were all fouled up and it quit pretty
quickly, so I put almost a full bottle of Sta-bil gas treatment in the
tank..about 5 gal capacity..and cranked some into the fuel system with the
starter..let it sit for a week and .Voila!  She started up and ran
fine..Changed out the "washer gas" and the filters and off she goes...I will
probably do a couple of more filter changes..

  I use a few ounces of that Sta-bil in my Van about ever couple of weeks
just to keep things clean...

  Don Hanson