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both are sick..I have a f4i and i love it,but i rode my boy,z 636...Smoothessssss bike i every wheelied...**** turns right into circles like nothing....
OK both are great bikes!! and after WWIII and the nuclear holocaust there will be 2 things left!! cockroaches and F4I's.....but the KAW is a way better looking bike!!
in my opinion i love my 636 its torquie and u feel like u sit ontop of the bike. ive rode f4i's and they have no ***** and u fel like u sit IN the bike