Why Did Harley-Davidson Change The Proven Gear Driven Cam Design?!

For years Harley-Davidson had success with the gear driven cam design of the Evo engine, but for the Twin Cam they went with chains. The switch to chain driven cams on the Twin Cam led many of us to go out on our own and convert to gear drives. Even the Sportster still has gear driven cams to this day. So why didn't Harley-Davidson just put gear driven cams in the Twin Cam to begin with? I wish the answer was a simple one but many factors are at work with Harley-Davidson going with a chain drive system. These same factors and issues with the Twin Cam engine are what led us to the single cam, silent chain driven design of the Milwaukee 8.
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Motorcycle: 2016 Harley-Davidson Sportster XL1200CP (Sportster 1200 Custom)
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Motorcycle: 2017 Harley-Davidson Sportster XL1200X (Sportster Forty-Eight)
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