My 1982 XT200 (has same engine as TW200) has 4300 miles on it. Anyway, the other day I loosened the clamps attaching the carburetor to the airbox boot and the intake manifold. The boot had been barely attached to the carburetor. Does one get shrinkage of the rubber boot after several decades? The rubber appears healthy and pliable. The existing clamp actually is not the best as I had to hold the nut with pliers to loosen it. So I'm going to replace that clamp with one that holds the nut so it doesn't turn. The only way I'll be able to get good overlap of the rubber on the carburetor is to loosen the hex screws holding the intake manifold onto the cylinder before I attach carburetor to the airbox boot and the intake manifold. Hopefully it will stretch enough allow enough rubber overlap and keep it from leaking air.