It's the extra 123cc of capacity from a longer-stroke version of MV's triple that makes all the difference. With dimensions of 79mm x 54.3mm, the 800 shares the 675's bore but has an 8.4mm-longer stroke. The changes give an extra dollop of grunt and a distinctly different character. According to MV's dyno charts, the bigger motor makes more power everywhere, especially above 6500 rpm. By 8500 rpm, the 800 is kicking out 100 horsepower where the 675 makes barely more than 80. When the 800 reaches 11,000 rpm and hits its peak of 125 bhp, the 675 is making its maximum of 108 bhp. In terms of torque, the 800 makes 25 percent more, peaking at 8600 rpm; the 675's peak comes at a lofty 12,000 rpm.