5 hp
The 4-speed Manual clutch Honda 70 (72cc) engine is rated at 5 hp.
Between 5.5 and 6 horsepower *7.5-8hp The Vanguard series is rated at 6.5 HP. Most small engines these days are no longer rated by HP but, rather torque. Several models of Briggs 205cc engines are rated at either 8 or 9 ft/lbs of torque. I can also add that the "Intek" and "Polar Force" series of the 205cc class are rated at 9 ft/lbs torque and 7.5 HP.
This is from movingsnow.com: Here is a simple chart of approximate cc to torque to horsepower conversions. It's not exact, but it will give you a better idea of how big the new engines are. I used 3600 rpm in the formula for this comparison. 179 cc = 5 hp 205 cc = 8 to 9 Gross Torque = 5.5 to 6 hp 250 cc = 11 to 11.5 Gross Torque = 7 to 8 hp 305 cc = 13.5 to 14.5 Gross Torque = 9 to 10 hp 342 cc = 15.5 to 16.5 Gross Torque = 11 to 12 hp
There is no one motorcycle, and no one answer. It could be 5 hp or 100 hp. The 2018 Harley Road Glide has 77.34 hp
The 2014 BMW 5-Series's engine produces 258 ft-lbs. @ 1450 rpm.
The 2003 BMW 5-Series's engine produces 175 ft-lbs. @ 3500 rpm.
The 2001 BMW 5-Series's engine produces 175 ft-lbs. @ 3500 rpm.
The 2012 BMW 5-Series's engine produces 260 ft-lbs. @ 1250 rpm.
The 2013 BMW 5-Series's engine produces 260 ft-lbs. @ 1250 rpm.
The 2002 BMW 5-Series's engine produces 175 ft-lbs. @ 3500 rpm.
The 2006 BMW 5-Series's engine produces 185 ft-lbs. @ 2750 rpm.