Question about 1981 kawasaki KZ 1300 A3

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1979 KZ 1000, with four mikuni vm26ss. Pilot Fuel Screw located on the engine side, opp. air filters. In or out for air? Category section would not let me enter proper info.

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Those arent ajustment screws as the screws are in front of the float bowels in the center of each carb and they only trun a quarter turn unless the locks have been removed they'll keep turning with the blows off and they are likly to be dirty. Remove and wash out with carb cleaner and compressed air as all the other jets do too. The ones in the air horns too. Air screws are out 1 1/2 turns if the motor is in good shape' The screws in the sides are plugs that let you hook up your vacume gauges to sync the carbs. with all the vacume matched up then adjust the air jets then re sync the air then resync till any change makes it worse then ride it to see what you got their more senitive with the idle set low and it keeps to have a strong fan on the motor as sitting still with the motor out of tune till you get it right makes a lot of heat. When its right the sync gauges are on the same numbers and you hit the gas just some they all move together to the same number and hold RPM's just fine staying on the same numbers as if it won't do it the exhaust valves may be too tightand as it heats up everything changes and if you ride it it ca smooth out as the temp comes down with speed and the lash will open a little. Too tight and it changes too much to keep the tune.

Posted on Sep 07, 2009

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First - I do not know this bike specifically, but with 4-strokes the screw usually adjusts the fuel, not the air in the pilot circuit. Keep in mind this screw only adjusts the mixture from idle up to just under half throttle. It won't effect higher engine speed performance.

Basically, you can adjust them in 1/2 turn increments until you get the desired performance. Or, fire it up, and adjust the screws with it idling until you can get the highest, smooth idle - this is likely where it will be best.

Now - if the screws are 'behind' the carb slide (air filter side) they are an air screw. If they are on the engine side of the slide, they are fuel screws - the two work opposite of eachother. They're likely on the engine side of the slide, so screwing them in will lean out the pilot circuit (less fuel). So - if after you adjust the screws as described above, check to see how far out from seat they are. If you are not around 1.5-2.5 turns out, you might consider changing the pilot jets inside the carb.

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