Ton of Fun to Ride 248 pounds, 4-stroke, SINGLE OVERHEAD CAMSHAFT, 4-valve, single, TCI, electric starter The new 2009 BWs 125 is powered by an all new 125 cubic centimeter, four-stroke engine. Featuring a gas sipping fuel injection system, an environmentally friendly catalyzer exhaust and a fully automatic gas it and go transmission, the new BWs 125 is economical to operate and a ton of fun to ride. Two-up seating means you can share the fun with a friend. The single-cylinder 125 cubic inch, four-valve engine provides plenty of power while the fully automatic transmission and electric starting make it a snap to operate.