I bought that 140

Then on the elbo into the carb there is a screen. If those two check out, internal carb is next. When you checked this all out, very likely a good cleaning is in order. Don't go roaring off to the parts counter. I've put these carbs back together and used them years after mechanical minds said they were worn out. Remember the slogan on original IH gas caps, "Buy clean fuel and keep it clean". That worked for 30 years, then we started getting a thing called rust on the inside of our fuel tanks. Especially bad on tractors parked long periods with little fuel in the tank, then you go and use the tractor and wash all the rust down from fuel slop. A sediment bowl works well for taking off water, now if we could install a rust crusher so that bloomin rust would flow through the sediment bowl stem and not the screen, we'd have this thing licked.

I 've got one of these tractors I've owned for 50 years, it's worked well with factory screens. I've owned 5 other offsets and several other gassers and never bought an inline filter in my 65 years. My Farmall 300 must have 25,000 hours on it by now with no inline filter. Those things spell nothing but trouble for graviety systems.