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b7897 tool s7919a xe
ATK50 - notice the tool marks on top of piston
ATK50 - took a 4 pedal reed block stock
ATK50 - - the intake transfer connects to the transfer ports nuts
ATK50 - bore stroke 39 x 417 rate at just under 10hp
ATK50 - the stud holes are off just a little bit from a puch or tomos