It’s common for the bushing around that pin to wear and leak exhaust gas. That pin runs a flap contraption that helps your carb warm up faster. Some people try to replace the bushings. I think most take out the pin and replace it with bolts and weld it shut. Those of us that are unsure what to do, and don’t want to do something that permanent, use bolts with nuts and high temp sealant. That’s what I did. Works. When that pin and flap is removed your 40 will definitely take longer to warm up. In any event, you’ll need to take off the manifold to do anything about it. And you’ll need to buy a blocker plate from SOR that sits between the intake and exhaust manifolds. Not a complicated job but it’s a pain.