A rich mixture could be caused by either 2 things, too much fuel or too little air, i'm afraid i dont know much about carbs, but have you done much in terms of cleaning them using some car cleaner since you got them?
I definitely think you should try and find the cause of the issue instead of buying a new CVH engine, as it could have exactly the same issue.
Are you using the standard carb or bike carbs?
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