The best I understood is that the hydro's take an extra 2hp, so in theory your 149 would have the same output as a 128.
The other theory I heard was that the clutches wouldn't take the power of the bigger engines.
But I don't but that, I've but my 128 under some heavy loads ploughing and that clutch has yet to let me down.
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128 X 2, 129, 149, 1250, 1450 x 2
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