GT6000

So, I've got the old girl running rather well. As I pointed out b4 this tractor has a Walbro carb, my question is, how do I know if I've got a fixed jet carb or an adjustable jet carb?
 
adjustable jet carbs have adjuster screws poking out the sides.
Fixed jet carbs have nothing there but a throttle stop to set idle speed.
Early in the days of no adjustable carbs they just fitted plugs over the top of the screws.
 
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