![]() ![]() While a 2-stroke will never offer the torque of a 4-stroke, they come close enough for most weekend riders. New technologies have reduced exhaust emissions while increasing power. Today, however, 2-stroke dirt bikes are making a comeback. This advantage explains why a 250-cc 2-stroke engine makes more power than a 4-stroke of the same size.įind your Local AMSOIL Distributor THE RESURGENCE OF 2-STROKE DIRT BIKES A 4-stroke engine requires two crankshaft revolutions. Pound-for-pound, they make more power than 4-stroke bikes.Īn internal combustion engine completes four stages during each combustion cycle: intake, compression, power and exhaust.Ī 2-stroke engine requires only one complete crankshaft revolution to complete the four stages of combustion. Two-strokes were popular back in the ’70s and ’80s. That’s why most manufacturers recommend rebuilding the top end of the engine every 50 hours or so. Oil sump temperature can surpass 300✯ (149☌), causing the oil to break down and fail to protect the engine, leading to wear. Revving the bike to 10,000 rpm as you chase glory on the racetrack increases heat, which causes oil to break down faster. That’s a ton of stress on one relatively small piston. They’re lighter, easier to handle and less expensive.ĪMSOIL Dirt Bike Engine Oil 4-stroke dirt bike challengesĪll that power and torque comes with a price, however, and it’s increased time and money spent on maintenance.Ī typical 450-cc four-stroke makes about 50 horsepower from an engine that’s about the same size as a lawnmower engine. You not only need skill to pull off that feat, you need the kind of stump-pulling torque only a 4-stroke dirt bike offers.Ģ50-cc 4-stroke bikes are also popular, especially for weekend warriors and beginners. A professional rider on a 4-stroke dirt bike can nail a complicated triple jump with just a 10-foot runup. ![]() Big power and torqueįour-strokes make massive power and torque given their relatively small engines. A 450-cc four-stroke dirt bike, like a Honda CRF450 or Kawasaki KX450, is the top choice for riders competing in sanctioned races. ![]()
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