Hello, I have just bought belt for my air pump that goes from the fan to the pump.
But for some reason its really loose and I cant find anything that tells me if theres an adjustment to turn the air pump to make the belt tight.
Does anyone know of one or did I buy the wrong belt ?

 

That belt also goes around the e-shaft maybe that's where you missing. The tension is applied to the belt by the air pump moving outward on the bottom. Lossen the top trough bolt and the tension bolt. Use a pry bar or whatever to gain the tension. Then tighten the adjusting bolt then the through bolt and your good.

 

Yeah, I found it. I had the belt around the e shaft as well as the shaft for the fan, but the reason it was a bit loose was because I hadn't adjusted the air pump to tighten it. I couldn't find the adjuster for it. It was on the bottom of the air pump.
Loosen that bolt, and the bolt at the top, and you can turn the whole air pump, then tighten them both down. Weird thing is, now that I've hooked up the air pump, the car doesn't idle very well. I got it w/out the air pump belt, now that its on.. tsk tsk, doesn't want to run right.
Any carb gurus tell me how to adjust the fuel mixture screw and the idle screw? I don't want to mess it up too badly, a rebuilt carb costs too much $ for me to tinker with it.

 

Adjusting air/fuel ratio on carbs is a very common question. Do a little bit of searching, you should be able to find the right answer.