muffler presher

clayton a

im just trying to stay on the motorbike
i got my first bike a 1975 honda cl360 at the beggining of last summer and got it running desent and am planning to do a restoration/cafe racer job to it and i cranked it the other day and put my hand behind the muffler and knoticed that the top one of the two was pushing much air than the bottom what dose that mean a card problum or what?
 
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