Here is a link to the homemade
carb sync tool but be careful, you can suck oil in the engine, I use the 2 stroke for that reason it won't hurt anything if you suck the oil in. Another member here had the idea to put a small ball valve at the bottom of the yardstick so after hooked up you can slowly open the valve and if it looks like you are going to suck fluid in the engine close it again and adjust the balance some then try and reopen again. Once you can fully open the ball valve adjust until the oil is even on both sides.
