Hey everybody, I have a tnt 640 that I onw with chevyTNT. One thing we found out is that the duel carburetors are hard to set just right. I was just wondering if anyone has an opinion on the materials used to make gaskets that go in between the intake manifold and the engine. We used paper thing gasket material and put RTV silicone on the both sided of that material. We hope to get this snowmobile going in the next couple of days with the help of a couple of friends. Thanks to all you who offer opinions. We love our old skidoo snowmobiles.