SR400. The latter was reintroduced to markets outside of Japan in 2014. Performance The Boulevard 40's engine is a 40 c.i.d. (652 cc), four-stroke, air-cooled, single overhead camshaft power plant, incorporating a Twin-Swirl Combustion Chamber (TSCC) cylinder head design first used in the Suzuki GSX series motorcycle engines. This engine features a balance shaft and an output of 31 horsepower. At 60 mph the engine is spinning at a moderate 3940RPM. In 1996 Motorcycle Consumer News measured 31 horsepower at the rear wheel of an LS650 Savage, and a rear-wheel torque of 30.5 pound-foot. The LS650 registered a quarter mile time of 15.3 seconds at a speed of 81.1 mph, and an average fuel mileage of 55 mpg. In a 2006 road test, Motorcycle Cruiser magazine recorded a quarter mile time of 16.35 sec at 77.2 mph. Average fuel mileage for the S40 was 52.9 mpg. The S40's "thumper" engine (single-cylinder, four-stroke), is among the largest displacement single cylinder motorcycle engines in production as of 2018, alongside the Suzuki DR650SE and KTM 690 Duke. References External links Suzuki Savage at the Open Directory Project Boulevard S40 Cruiser motorcycles Motorcycles introduced in 1986 Belt drive motorcycles