Here’s a handy-dandy video that shows you exactly how two-stroke engines work, in addition to the parts they have: Four stroke dirt bike engines are a little more complex than their two-stroke counterparts. The great debate. So now you know how the two engines differ, what difference does it make to the dirt bike? Once upon a time there was a huge difference between the way a 4 stroke and a 2 stroke dirt bike performed. They are also much harder to clean, due to the higher number of parts they’re built of. This action blocks off the exhaust and intake ports, enabling the piston to compress the fuel and air mixture. 2 Strokes are generally more unstable and accelerate faster, while a 4 stroke is more consistent and has a higher top speed. We may earn a commission when you buy through links on our site. As long as you’re prepared to be heavily involved in the maintenance, upkeep, and rebuild of your engine, this could still be a good choice! The pros of a 2 stroke VS a 4 stroke, according to some riders, include: quick and fast acceleration, weighs lesser than a 4 stroke, lower cost of maintenance and repair, easy to get the job down and all around performance of the bike. Absolutely! On the first, or “intake” stroke, the piston lowers, pulling in a mixture of air and fuel. Maintenance for a dirt bike with a four-stroke engine is definitely something you need to consider before you purchase one. The 150 is one of the lightest trail bikes available, but it has plenty of power. Unfortunately, since there are fewer parts, each of the parts does more work, and are subject to more wear on average. If your engine is lightweight, you can get started and slow down with ease. Like the name suggests, a four-stroke engine takes four strokes, or movements, to complete an engine cycle. I said this before with the two-stroke engines, and I’ll say it again because it’s important! Because a four-stroke engine has a wider range of speeds at which it can run effectively, braking, shifting, and clutching, you don’t have to shift as often, leaving you more room to focus on other things, like not dying. (At least, it does in my opinion.). While having a more simple engine is an absolute dream when it comes to doing your own repairs, there are some definite downsides to the two-stroke engine. Because the two-stroke dirt bike engine operates on just two strokes to complete an engine cycle, it produces more power per stroke. It seems that the technology already exists to create a two stroke engine that is just as, if not more environmentally sound as a four stroke. Once we know the contrasts between the two, it will be easier to understand the different kinds of pros and cons that exist between the different engine builds. Think about it with a childhood memory: running with your backpack on. And much like the never-ending ‘Holden vs Ford’ debate here in the Southern Hemisphere, I truly don’t feel mankind will come to an agreeable conclusion as to which one of these darn bikes is better?! Which is better in the offroad category? The first thing you'll notice when you look at a 2-stroke dirt bike is the big exhaust pipe. “With more manageable power output, comes more manageable responsibility”. BUT if you had two or three workbooks, your lunchbox, and a water bottle in your backpack plus the folder and the notebook, getting started running was a little bit more challenging because you had extra weight to move. If all you had in your backpack was a folder and maybe a notebook, running was no issue at all. Throughout the world, dirt bike bikers say concerning whether 2 strokes versus 4 strokes are the better engine for motorcycle. Not only is the initial cost of a two-stroke dirt bike cheaper, but upkeep is also generally cheaper on these engines. No matter what two bikes you choose, too may things were different to make it a legitimate comparison. While this does provide for things like quicker initial acceleration, it does have some downsides. All over the world, dirt bike riders argue about whether 2 strokes versus 4 strokes are the better engine for dirt bikes. I myself am an owner of a 2007 yz 450f and it is the fastest and best bike i have ever owned and i have owned many 2 stroke and 4 stroke bikes. In fact, the vast majority of the dirt bikes I have had through the years have been 2 … Lightweight dirt bike engines can also good for trail riding at times. Before getting into the similarities, here’s a quick review: Two-stroke dirt bike engines have two movements of the piston that take place in order to keep the engine going. I'm Jim Harmer. Back in the day, you know… waaay back in the late 1990’s and early 2000’s, you would watch racers like Ricky Carmichael , Jeremy McGrath , … This ignition forces the piston down for the “power” stroke, followed immediately by the “exhaust” stroke, pushing the exhaust out of the engine. Prior to my life of dirt biking, stroke meant one of two things. The Garage Manual makes maintaining and enjoying your dirt bike ridiculously simple. Is it easier and cheaper to maintain and repair? It’s the same with engine weight. The four-stroke … The ignited air, fuel, and oil mixture force the piston down until the mixture reaches the exhaust port, an opening on the side of the cylinder. Four stroke engines make a lot of sense (creating a lot of pros that we’ll talk about later), but they aren’t as efficient as a two-stroke (which leads to some cons that you’ll learn about in a moment). You simply need to saddle up on a few different ponies to find out which one suits your personality (and budget).. and get on with having some fun! If this is weight ratio is not balanced, riding a dirt bike is going to be pretty darn challenging. A stroke is a motion of a piston, meaning a two-stroke dirt bike has 2 different motions of the piston, while a four-stroke has 4. Depending on the manufacturer, price points for both 2 stroke and 4 stroke dirt bike vary widely, with 2 strokes costing relatively less. Four stroke engines are heavier, which results in a heavier bike when similar cubic centimeters are concerned, sometimes weighing 50% more than comparable two-stroke engines. As we consider the old axiom, “with great power comes great responsibility”, we can apply a similar outlook to dirt bike engines. However, two strokes work better on some terrains and are more efficient on different types of dirt biking than four-stroke engines are, and vice versa. For instance, you need to consider the type of riding you are planning to do. Dirt bikes with a two-stroke engine are generally lighter, produce a higher pitched noise, and are cheaper than dirt bikes with 4 stroke engines. So why have some companies stopped making 2 strokes? Four stroke engines will give you more torque at a lower RPM. Good. However, when it comes to dirt bikes, we’re talking about something entirely different, that has nothing to do with hospital visits or sudden flashes of inspiration. But on the other hand, a lot of riders don’t actually want that. The good news for you and me my fellow rider.. is we have a choice of either! In the early days of dirt bike performance, the 2 stroke motor was the only real choice for racing and performance. Keep on reading to find out! 2. Typically a better bike for beginners, a four-stroke engine is great for both trail riding and racing. Print it and hang it in your garage and you’ll have the perfect dummy-proof reference and maintenance charts! Top European manufacturers understand the importance of the development and progression of 2 strokes and are still forging ahead with them, winning many Enduro competitions – interestingly enough all throughout Europe where the AMA has no influence… hmm. Preference of other riders picking whether 2 stroke VS 4 stroke dirt bikes comes down to a personal preference. They do, however, have elevated fuel consumption, and because of the way the stroke of the engine works with the openings in the chamber, it produces more emissions. This is the site where we share everything we've learned. Some people believe (and blame) the format of the AMA and large companies such as Honda that have had a heavy influence over the major Championship races that dictate the specifications of bikes that are allowed to compete against each other. Maintenance is needed much less frequently since the work the engine is doing has been spread out through more parts. It should be beneficial for you to make the ultimate decision. There are some good trail bikes … If you buy a used two-stroke, though, you’re gonna save even more money. The upward action of the piston pulls in the next fuel and air mixture from the carburetors and keeps it underneath the piston. For years the 2 stroke vs 4 stroke battle has raged on. The Garage Manual makes maintaining and enjoying your dirt bike ridiculously simple. In describing the differences, there are already some similarities that we can see: 1. It’s a true straight-forward guide for the rest of us. This is the site where we share everything we've learned. Finding the right dirt bike for your kid can be a little challenging sometimes--especially when it comes to finding the right price. (As opposed to.. why not 250cc vs 250cc?). 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