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Does my carb need rejetted after replacing head pipe. Did not replace muffler/ spark arrestor. 660 Rhino. Thanks.
 

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If you replaced OEM with OEM then I would not think so. Did you happen to look at your spark plug prior to the swap? It's a pretty good indicator of how your engine combustion process is doing: black and a little sooty - your likely running too rich, while white and almost powdery you're running too lean. If your new pipe is larger than OEM you may have to go up a step in jet size.
 
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