Cut a piece of 1.625 dia, 0.049 wall, 304 SS tube to length to fit between the angle piece tacked to the cross tube and the carburetor. Fit a 2" x 1.5" silicone reducer to the Rotec carb outlet and the 1.625 intake tube. The 1.5" silicone reducer stretched over the 1.625 tube ok with some grease lube. Tacked the tube to the angle piece.
