Well my lovely little two stroke has been giving me problems lately. It started off running great with a new battery installed and carbs cleaned and i road it around a bit. Then it started to what seems like drain the battery, start up would be great but once it ran for a few minutes it would not idle anymore just die. If i held the throttle it would run fine when stopped. During this if im not giving it gas the headlight and tail light would dim. I let the bike sit for about a month because i expected it to be the coils and couldn't rightfully let my girlfriend ride the thing while having to hold the throttle at stop. Well i've checked the coils and im getting spark, Ive tried push starting it and it wants to start, it winds up but then dies promptly. Is ANYONE familiar with this bike i know they're quite scarce but this one has 1200 on the clock and is in immaculate condition. Is it my generator, points? im lost help!
From what you've said, my guess would be to double check the fuel system. You said that you cleaned the carbs, might want to double check and make sure that fuel is flowing freely from the fuel petcock.
If I remember correctly that bike had the vacuum operated style, which was notorious for giving people fits (wound up replacing mine with an aftermarket style on both a GT380 and a T500). Might try running the bike on the "prime" setting and see if it stays running; If it does, while it's running, switch over to run or reserve and see if it dies out.
Headlights dimming while the bike is running at low rpm isn't unusual, so I wouldn't panic over that. Hope this helps! They're neat little bikes.