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But with care, they always seem to come out O.K. Since the towers appear none too robust, this procedure always brings a bead or two of sweat to the brow, since a broken tower would trash the carb body. To change float valves, these pins must be drifted out carefully with a small punch. * The pins holding the floats were now pressed into place in towers (unlike Hitachis, where these pins float and are trapped in place by the float bowl).
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Early Mikunis has a screw plug in the float bowl under the main jets, so these jets could actually be changed without removing the float bowls. * And as time went on, Mikunis got harder to work on. * Mikunis have a pull-push throttle cable which is slightly more complex than the typical Hitachi single cables, but not really a problem. In short, complete disassembly is somewhat more of a hassle than with Hitachis. These carbs use a different linkage between them which must be removed to get to one of the float bowls. These carbs also use the same carbholder stubs as the later (’83-’87) Hitachis. * Removal and installation of these carbs follows the Hitachi method. In one or two ways, however, it can be argued that Hitachis have the edge in terms of tuning and ease of assembly/disassembly. The linkage between the carbs is greatly improved. Like the later Hitachis, they have built-in coasting enricher circuits. They are CV carbs with diaphragms, but have a flat slide instead of a round one. Mikunis are the same size (40mm) and have the same mounting dimensions as Hitachis. Mikunis represented an updated, more modern design and were used with only minor changes through 1999 when the last big Viragos were built. In 1988, Yamaha finally retired the Hitachi carbs that had been serving up fuel to all of the bigger Viragos since the beginning of the line in 1981. For carb theory and function try the CV Carb article. Much of this information applies to Virago Mikuni carburetors as well, and I suggest you read the Hitachi article before continuing with this article. NOTE: The Hitachi Carbs article found on this website tells about removal, disassembly, tuning, and common problems.