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4 into 2 Mac exhaust

Leonanamilena

CB750 New member
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Elizabeth, nj
Hi guys I'm new here, I have a 1972 cb750k and I wanna replace the original exhaust with Mac 4 into 2 , do I need to change the carb jets? I have the stock air box
 
More than likely yes but you wont know until you ride it and see how it runs and how the plugs look.
 
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