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So, here's the deal. You can't just bolt it on because the 38mm bores are too big for the holes in the manifold. The manifold has to have the throttle bores ground or machined larger to accommodate the larger throttle plates. This can be done one of two ways. You can remove the manifold, scribe it with the outline of the center hole from a 38mm base gasket, and then grind away the excess aluminum, or do it the easy way, by buying an already machined manifold for the carb from Metric Mechanic. Jim Rowe, from MM, has manifolds and carburetors ready to go, with gaskets and filters, etc as a kit. That's the best and simplest route. Jim says that the carburetors he supplies have been rejetted especially for this application.

    Once the manifold is ready, it bolts to the head with new gaskets and the carb bolts onto the manifold with new gaskets and a heat spacer. The throttle linkage attaches in the same way as with the DGV Weber, the fuel line is the same, the air filter is the same, and the electric choke uses any wire that becomes hot when the ignition key is turned on.