Before doing this, make sure plugs, air filter etc is in good shape.
A.EQUIPMENT
1. one large balloon (25 cent size)
2. 6 feet of clear plastic aquarium tubing. Get the 3/16" or so diameter size. (Cost about $1.00)
3. Two hard plastic cups. (About a buck apiece). Not soft plastic...hard plastic or the vacuum will crush them.
4. Duck tape or clear strapping tape, clear is better for vision. (cost about a buck)
B.EQUIPMENT ASSEMBLY
1. Drill a hole in the bottom of each cup, slightly smaller than the diameter of the tubing.
2. Cut the lip and neck off the balloon, and stretch the rest of the balloon of the top of one cup, making a diaphragm. Tape the balloon/diaphragm to the cup.
3. Tape the two cups together, so that the diaphragm separates the two cups, and the small drilled holes are at each end.
4. Cut the plastic tubing into two 3' sections, force a piece through each drilled hole. It should fit air-tight. By blowing or sucking on either tube, you should be able to make the balloon/diaphragm move.
C. PROCEDURE (at least for GS models)
1. set the idle on the high side....1500 - 2000 RPM, then shut off the bike.
2. Note the rubber boots between the carbs and the intake manifold, there is an Allen wrench plug on each boot.
3. Remove the plug on carb number three (third from the left). Carb number three has a fixed airflow, all other carbs will be balanced against #3. Insert one of the plastic tubes into the hole in the rubber boot. It should fit snug and pretty air tight. Remove the plug from the boot on carb number one. (Left side of engine) and insert the other plastic tube.
4. Start the engine. If the carb are balance, the balloon will stay in the middle...if not the balloon will bulge noticeably.
5. Adjust carb #1 (screw with set nut on throttle bar in front of carb) until the balloon remains flat in the center of the cup.
6. Repeat setting carb #2 and #4 against number three. For good measure you may also want to check number one against two and four.
7. Keep a few extra balloons handy. If you are way out of balance, the vacuum may break the balloon.
8. You may have to lift the tank, unless you have small hands and don't mind minor manifold burns on your knuckles.
9. When all is done, reset the idle.
10. Ride
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