Dad's 12 HP in his 125 was great till I moved out and bought a 14 HP 147-- makes the 12 HP look tiny.
Never used a 16 HP but I bet that one is even better. Dad said they really thump.
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Daniel G.
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(May 1970) 147 w/an IH spring assist, 48" deck, 42" blade, 1969 73, #2 trailer, 10" Brinly plow and (on loan) Dad's #2 tiller.