The Evolution 883 Sportster produced only 55 horsepower. The 1100cc V2 XLH made 63 horsepower with an increased bore and 8.5:1 compression. The 1200cc Evo increased horsepower to the 65 to 66 range. It did this by increasing the bore a phenomenal 1/2"over the 883cc model by boring out the same cylinders! Modified heads also contributed to this
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