Mikuni carb swap help please!!!!

Yammy73gp338

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Joined
Dec 25, 2018
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I have a 1973 Yamaha gp338 the only year that made that motor with the twin carbs. I want to swap the unreliable keihin carbs to Mikuni carbs . Do I need two Mikuni carbs or one carb and what size Mikuni???
Please help
 



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