Braking power wouldn't increase and I'll explain why: In every motorcycle, when either of the brakes are applied, weight is shifted towards the front of the bike making the rear end lighter. When this happens, it is very easy to lock the rear tyre if excess braking is used. If you're applying the rear brake carefully, you'd end up applying the same amount of breaking power, be it a disc or drum.
The only advantage the rear-disc has over a rear-drum brake is that the disc would not lose its power if the brake is used repeatedly in a small period of time, especially on a slope. Try using the drum brake only on a slope and you'll notice that once the drum gets hot after repeated use, the brake would lose its efficiency temporarily until it cools down again. This is a minor thing and you probably wouldn't even notice it in regular riding conditions.
Some bikes, like the Hornet, have their weight distribution in such a manner that you can use more braking power before the rear tyre locks, making you feel that its rear brake is more powerful. At the end it is a matter of personal preferences. But do test ride the bike to get a better feel. Disc brake or not, the SF is one hell of a great bike!





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