In technical specifications, Kawasaki KX 250 is powered by 249 cc engine , while Kawasaki KX 450 is powered by 449 cc engine. Kawasaki KX 250 is available in 1 different colours while Kawasaki KX 450 comes with 1 colours.

KAWASAKI KX™450XC The all-new 2021 KX450XC has been designed as the flagship model of the KX XC lineup. Whether in the woods, desert, or cross-country the KX450XC is a race-ready championship winning machine right off the showroom floor, and shares numerous winning traits of its motocross counterpart, the KX450.

450cc bikes are much faster than 250cc bikes, but you don't want to choose bikes based on how fast they go. Take into consideration your weight, height, and riding ability, to make the right decision on which bike would suit you best on the track.

Four-stroke. Sometimes this torque can be a bad thing. However on a 454 stroke it can make it a lot easier if you're coming out of a corner. And have to hit a jump.

The changes from the KX450 to this KX450X model are also minimal. The usual 18 in. rear wheel, kickstand, a minimalist skid plate and rear disc guard, and softer suspension settings make up most of the changes here.

449 cc Kawasaki KX 450 is powered by 449 cc engine.

Both are great of course, but riders who crave horsepower above all else have to go with the 450. It has unholy amounts of it, and it's also cheaper to maintain than the extremely high revving 250, which is a big reason why you see so many strapped-for-cash privateers choosing to race 450s.

The reality is 2-stroke bikes with the same engine displacement typically have significantly more power than their 4-stroke counterpart. So deciding between the smaller 250 2-stroke against the 450f is not unrealistic.

450cc bikes are much faster than 250cc bikes, but you don't want to choose bikes based on how fast they go. Take into consideration your weight, height, and riding ability, to make the right decision on which bike would suit you best on the track.

Most 250cc and 450cc dirt bikes have the same frame. The main differences are that the 450cc bikes can be made larger and wider, to fit the bigger engine. Though this difference is not always detectable. 450cc bikes weigh more than 250cc bikes, again because of the bigger engine size.

The most powerful and fastest dirt bike currently, is the KTM 450 SX-F, a 450cc bike with a top speed of 123 mph. The 450 SX-F was a Motocross Champion under rider Ryan Dungey in the dirt bike category. A 449cc engine powers the bike which weighs just 237 pounds.

Most 250cc and 450cc dirt bikes have the same frame. The main differences are that the 450cc bikes can be made larger and wider, to fit the bigger engine. Though this difference is not always detectable. 450cc bikes weigh more than 250cc bikes, again because of the bigger engine size.