4 stroke engines

July 15, 2015

4-Stroke Engines !

If you're on the fence about the differences between 2 stroke vs 4 stroke dirt bikes, hopefully today's blog will shed light on some of the pros and cons folks have shared when it comes to choosing the right dirt bike engine.

The same basics apply to a dirt bike engine as any other type of high-performance engine - it's all about the power and handling capabilities. Comparing 2 stroke vs 4 stroke dirt bikes is like comparing apples to oranges on several levels. Let's talk about it.


Let's face it, in the eyes of the modern day motocross racer, 2 strokes are a thing of the past. But don't let anyone fool you into thinking that a camshaft equipped bike is superior to the modern day 2 stroke though. The 4 stroke equipped dirt bikes have the upper hand thanks to race rules regarding engine displacement. To help make them competitive they literally doubled the displacement for what is allowed for a 2 stroke. As the 4 stroke evolved and progressed over a few short years it was clear they were an advantage and sales went through the roof while pre-mix stayed on the shelf. If you rule out the stone-age discrimination and ran a 250cc two stroke against a 250cc 4 stroke that is where things start to get interesting though. Suddenly the 2 stroke doesn't seem so slow and its strengths far outweigh any weaknesses. Let's break down their differences when it's an even playing field.

Starting in the early 2000's, 4 strokes have dominated the track.

Power delivery is hands down the biggest difference between the respected engine types. 2 strokes hit hard and fast, leaving an explosive impression on the rider. 4 strokes are definitely less intense with the way the power is put to the ground and gives the rider a choice of how they want to ride the bike.

Since the 4 stroke's power is a little more user friendly, hard pack conditions or situations where traction is necessary gives it a clear advantage. Inside ruts, hard pack dirt, and throttle finesse make a 4 stroke rider grin ear to ear. This is because of the 4 stroke's engine cycle when producing power. Since a 4 stroke makes power on every other stroke of the piston, it allows the power to be much more manageable. Without power to the wheel on every stroke, the milliseconds in difference keep wheel spin to a minimum. The opposite can be said about the way power is delivered on the two stroke. Sandy, loamy, loose dirt is where the 2 stroke shines and with the right rider can be the ultimate track weapon.

Source: www.motosport.com
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