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The idle adjustment is an extended cable that locks on to the air filter housing. It's a little black knob that is between the rear exhaust pipe and the air filter cover. The petcock is vacuum operated so if you don't have that connected to a vacuum source it won't feed enough fuel. You can move the petcock to the PRI position to bypass the vacuum line but you will need to get that fixed if something is wrong with it. To check if the carb is getting fuel you'll need to remove the air filter housing and open the drain screw on the bottom of the carb. If fuel comes out very slowly or is discolored, you need to look at the petcock and fuel filter. If you have a steady stream of fuel then the issue is probably carb related. These bikes have accelerator pumps so twisting the throttle should shoot a stream of fuel into the throat of the carb. From there the jets will take over for idling and cruising. If twisting the throttle shoots fuel in and the bike starts but won't idle then it's likely that your jets are clogged. When you clean up the carb do not use carb cleaner on the vacuum diaphragm on the slide. It will damage the rubber and you'll have to replace it.

Edit- The little black idle adjustment knob is between the front exhaust pipe and air cleaner, not rear. I'll try to take a picture for you later.
 
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