I posted a home made carb balancer in a thread "carb balancer for the poor man". Uses a yard stick to secure the tube to. I recommend using 2 stroke oil so if it gets sucked into the engine it won't hurt anything. Also be sure BOTH lines are hooked up before starting the bike or it WILL suck the liquid in.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!