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Does the slide move in the carb?  If not, you can try spraying it liberally with WD-40 or similar stuff and letting it sit overnight.  Once you get the slide moving freely, you should dissasemble the carb completely and clean it thoroughly.  Blow out all the air and fuel passages with compressed air and make sure they're not clogged. Not a good idea to clean them out with needles, nails, wire, etc., since you can hog out or scratch a passage or jet pretty easy doing that. Inspect for broken, rusted, or excessively worn parts. Check for excessive slide/bore wear, etc..  It's been a while since I tinkered with an Amal or Mikuni, but I remember them as being pretty simple mechanisms.  Usually all I needed to do was clean them up good, make sure nothing was broken or grossly worn out, and that the slide moved freely.  Good Luck.

 

Thanks Guys.  When I get caught up on some of my other projects I'll dig into it and see if it's worth restoring.  The engine turns over and seems to have good compression and it looks pretty solid mechanically.  Unfortunately, the poor thing has sat outside for a long time and the tank/fender/side cover plastic and the seat are in in pretty bad shape.

 

A friend gave me an old KTM but didn't know much about it since someone gave it to him years ago.  It has an orange frame, enduro-style exhaust with chrome tip, multiple holes on swingarm for lower shock mount, straight Ceriani forks, i.e. not leading axle.  Found the following # on engine: 4-55000832 and on frame: 54411-79199.  The tank, sidecovers and fenders are all aftermarket plastic & doesn't give any clues.  Any ideas what year & engine size?