well on the track the 2 stroke will beat the 4 stroke anyday. the only real reason they made a 4 stroke to race Motocross is because 2 stroke polutes much more and uses more gas than the 4 stroke does. if ur looking for topend speed ove a long distance than a 4 stroke is ur best bet. the 250 2 stroke has less horsepower than the 125 2 stroke but the 125 2 stroke needs to have rings replaceds ever 150 hours or so but its a cheap and easy job you can take the bike apart and put it back together in about 30 min for each. you can do the whole job if you have a honer. whilke the 4 strokes rings last longer you have to take the whole bike in to have the valves looked at and filed down. i own a 2002 suzuki RM 125 i have raced many 250 4 strokes and have never lost my bike is all stock exept the pistion and i have never lost to a single one plus it is way more fun to ride with a powerband. but i guess you have to figure out which you feel better rideing on.
two stroke engines have a power stroke every second revolution of the crank shaft. four strokes have a power stroke every fourth revolution of the crank shaft. that is why a 125cc two stroke has about the same power as a 250cc four stroke.
The normal size of a go cart engine is either 125cc or 250cc. These engines are either two stroke or four stroke engines and can produce as much as 90 hp.
a 125cc varies between 65-85mph with a four stroke engine, and 65-up to 100mph with a two stroke
it will go 650 mphs
Yamaha TTR 125
in my opinion a two stroke engine is a better quality engine as compared to a four stroke engine!
A 250F (250cc four-stroke) is generally faster than a 125 (125cc two-stroke) due to its larger engine displacement, which provides more power and torque. While both types of bikes have their advantages, the 250F typically accelerates quicker and can achieve higher top speeds compared to the 125. However, rider skill and terrain can also influence performance.
A 125cc four-stroke motorcycle typically has a top speed ranging from 55 to 70 mph (approximately 88 to 113 km/h), depending on factors like the bike's weight, rider’s skill, and terrain. Four-stroke engines often provide smoother power delivery and better fuel efficiency compared to their two-stroke counterparts. Acceleration and performance can also vary based on modifications and the specific model.
The fastest production four-stroke single cylinder motorcycle is most likely the 2011 Honda CBR250R.
Depending on the type of 250cc engine, two-stroke or four-stroke, and the state of tune of the engine you can expect anywhere between 20hp for a nice relaxed trail bike to over 40 hp from a fire breathing two-stroke motocrosser.
i would say i two stroke because two strokes are much easier to fix, there faster and better.
four strokes last longer if rode right