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B&S 12.5 ->16

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I am looking at getting some more power out of my 12.5 IC vertical twin and was wondering how difficult it is to convert to a 16. After reviewing the documents from B&S it seems the only difference between the models(12.5 and 16) is the carb and the camshaft. Actually it seems like the only difference in the carb is some jetting. Any help would be appreciated. Thanks..John The engine is in a 6512.5 tractor.

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