I made my own sync tool from the directions at:
http://faq.ninja250.org/wiki/How_do_...carburetors%3F
It's called the "Two Bottle Method".
It's real easy to make. The only hard part for me to find were the hard rubber stoppers, but I finally found them here:
http://www.mclendons.com/
There should be a place similar to that around you if your not near one.