760 compression on a couch

im thinking of buying my brothers xl760 for the wife. but i did a compression check on it and the front cylinder is 148-150psi and the rear one is 135-138 psi. i know the 2 carbs have different jets on the 760s but i was just wondering if the ports are different on the two cylinders or is there anything that would be causing these numbers? maybe the rear cylinder is just loaded a little more than the front?
 
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