Generally, you get either torque or horsepower. They are interrelated as torque is horsepower times movement. I don't remember the formula as I've been out of school for several years. A larger bore will give you more low end torque but fall flat at high rpms. A smaller bore will really put out at high rpms but is a dog off the line.
An example, a friend kept after me to race when I rode sport touring bikes. He had a 1200 cc Harley. I had 1000 cc's in a Kawasaki Concours. It took a bit to get it together as I told him I don't race for funsies. I absolutely won't race in town as it puts others at risk. He left me off the line. We were racing a stretch of road that is right at a mile long. After about 1/8 of a mile, I was catching him and then pulled away as I got up the power band. At 1/4 mile we were nose and nose and after that I pulled farther away as his engine ran out of breath but mine was doing better. Peak power was at 9500 rpm and on the road, the bike was in its sweet spot at 80 mph. Had we raced on a 1/8 mile track, he would have probably beat me unless he missed a shift. At 1/4 mile, it would have been close. Longer than that, the larger bore ran out of breath.
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