Dirt Bike Weight and Engine Size Comparison


Dirt bikes weigh less than any other type of motorcycle thanks to small frames, light aluminum components, and no dash, lights, indicators, or side stands.

The average dirt bike weighs 203 lbs (92 kg) which is less than the smallest and lightest street bike. The Kawasaki KLX 300 R trail bike is the heaviest dirt bike at 282 lbs (128 kg), while the Yamaha PW 50 is the lightest dirt bike at only 90 lbs (41 kg). Trail bikes weigh more than race bikes, and 4-stroke dirt bikes weigh more than 2-strokes.

If you are unsure which dirt bike is right for you, the best way to get a feel for the bike’s weight is to take it for a test ride. If that is not possible, at least try to sit on each bike on your shortlist. To help you narrow down your search for the perfect dirt bike, I’ve sorted all the major dirt bike models according to their wet (curb) weight in pounds and in kilograms.

Complete List of Dirt Bike Weight (in lbs and kg)

For a complete list of dirt bike weights I’ve included a table below which includes engine capacity and weight in pounds (lbs) and in kilograms (kg). For a similar comprehensive list on dirt bike seat heights vs engine size, check out this post.

BikeEngine Size
(cc)
Curb Weight
(kg)
Curb Weight
(lbs)
Kawasaki KLX300R300128282
Honda CRF450X450125275
Suzuki RMX450Z450123272
Honda CRF250F250120265
Yamaha WR450F450119262
Yamaha YZ450FX450115254
Yamaha WR250F250115254
Kawasaki KLX230R230115254
Kawasaki KLX230R S230115254
Honda CRF450RX450114251
Yamaha TT-R230230114251
Honda CRF450-S450112247
Suzuki RM-Z450450112247
Kawasaki KX450 X250112246
Yamaha YZ450F MONSTER ENERGY YAMAHA RACING EDITION450111245
Yamaha YZ450F450111245
Yamaha YZ250FX250111245
Honda CRF450RWE450111244
Honda CRF450R450111244
Kawasaki KX450450110243
Kawasaki KX450 SR450110243
Husqvarna FC450*450110242
Kawasaki KX250 X250109240
KTM 250 SX-F Troy Lee Designs*250109240
KTM 450 SX-F*450108239
Honda CRF250RX250108238
Husqvarna FC350*350108238
Gas Gas MC450F*450107237
Kawasaki KX250250107237
KTM 350 SX-F*350107236
Gas Gas MC350F*350107236
KTM 250 SX-F*250107235
Husqvarna FC250*250107235
Gas Gas MC250F*250106235
Yamaha YZ250F250106234
Yamaha YZ250F MONSTER ENERGY YAMAHA RACING EDITION250106234
Suzuki RM-Z250250106233
Yamaha YZ250X250104229
Honda CRF250R250104229
Husqvarna TC250*250104229
Gas Gas MC250*250103228
KTM 250 SX*250103228
Yamaha YZ250 MONSTER ENERGY YAMAHA RACING EDITION250103227
Yamaha YZ250250103227
Kawasaki KLX140R F14099218
Kawasaki KLX140R L14095209
KTM 150 SX*15095209
KTM 125 SX*15095209
Gas Gas MC125*12595209
Yamaha YZ125 MONSTER ENERGY YAMAHA RACING EDITION12595209
Yamaha YZ12512595209
Yamaha YZ125X12595209
Kawasaki KLX140R14093205
Honda CRF125F BIG WHEEL12590199
Yamaha TT-R125LE12590198
Suzuki DR-Z125L12589196
Honda CRF125F12588194
Honda CRF150R15084185
Honda CRF110F11077170
Kawasaki KX11211277170
Kawasaki KX10010077170
Kawasaki KLX110R L11076168
Kawasaki KLX110R11076168
Kawasaki KX858575165
Yamaha YZ85LW8575165
Husqvarna TC85 (19/16)*8573162
Gas Gas MC85 19/16*8573162
KTM 85 SX 19/16*8573162
Suzuki RM858573161
Suzuki RM858573161
Yamaha YZ858573161
Gas Gas MC85 17/14*8572159
KTM 85 SX 17/14*8572159
Yamaha TT-R110E11072159
Yamaha YZ656561134
Kawasaki KX656560132
Yamaha TT-R50E5058128
Husqvarna TC65*6557125
Gas Gas MC65*6557125
KTM 65 SX*6557125
Suzuki DR-Z505054119
Honda CRF50F5050110
Husqvarna TC50*504497
Gas Gas MC50*504497
KTM 50 SX*504497
KTM 50 SX Mini*504394
Yamaha PW50504190
Dirt bike weights (in lbs and kg) and engine sizes (in cc) for most dirt bike brands (Source: Manufacturers’ websites)

The table above shows the engine size in cc so that you can compare the weights of similar sized dirt bikes. Some manufacturers’ bikes are lighter than others. I’ve quoted curb (wet) weights in the table which is how all the Japanese manufacturers list the weights on their websites.

The European manufacturers, KTM, Husqvarna and Gas Gas (indicated with an * next to the bike model), shows dry weight on their sites. As a result, I had to estimate the curb weight to keep it comparable by looking up the fuel tank, engine oil and coolant capacity, and then multiplying each by the weight of the relevant fluids.

Weights of Different Types of Dirt Bikes

While all types are dirt bikes weigh very little compared to other types of motorcycles, there are differences in the weights of different types of dirt bikes.

Dirt Bike Weight: Motocross (Race) vs Trail (Cross Country) Bikes

A motocross (or race/competition) bike and a trail bike from the same manufacturer will look identical to the untrained eye. Even though a motocross and a trail bike shares most of the same parts, they are designed with two very different styles of riding in mind.

A trail bike is designed to be more comfortable on longer rides on mountain or forest single tracks. Therefore, they have softer suspension and possibly a wide-ratio gearbox. A motocross bike needs to be fast around a race track, be able to soak up massive jumps without bottoming out, and accelerate quickly out of turns. Motocross bikes also have lower gearing with ratios that are closer together.

Yamaha YZ125 massive jump
Motocross or competition dirt bikes are designed to fly through the air without falling apart upon landing (Source: Yamaha USA)

As a result of the different demands placed on motocross bikes compared to trailbikes, motocross bikes tend to be lighter than comparable trail bikes. The addition of a kickstand, headlight, and maybe an electric starter will make a trail bike heavier than a race bike.

As an example, the Honda CRF 450 R motocross bike weighs 244 lbs (111 kg) compared to 275 lbs (125 kg) for the Honda CRF 450 X trail bike. Side-by-side it is hard to tell them apart.

Honda CRF 450 R vs Honda CRF 450 X
Honda’s CRF 450 R motocross bike is nearly indistinguishable from the CRF 450 X trail bike (Source: Honda USA)

At 243 lbs (110 kg) the Kawasaki KX 450 competition bike weighs 45 lbs less than the Kawasaki KLX 300 R trail bike that weighs 282 lbs (128 kg), despite the 450 having a much larger engine.

Dirt Bike Weight: 2-Stroke vs 4-Stroke

A 2-stroke dirt bike generally weighs a bit less than a similar-sized 4-stroke dirt bike. This is thanks to a 2-stroke engine having less moving parts that add weight. There are no valves, rockers, camshafts, and cam chains in a 2-stroke engine. For an in-depth look at the difference between 2-stroke and 4-stroke dirt-bikes, check out this post I wrote.

Apart from the engine, there are no differences between a 2-stroke and a 4-stroke motorcycle. To give you an idea of the weight difference, the Yamaha YZ 250 2-stroke dirt bike weighs 227 lbs (103 kg) compared to the Yamaha YZ 250 F 4-stroke that weighs 234 lbs (106 kg). Both are motocross bikes.

Dirt Bike Weight vs Engine Size

One of the heaviest components on a dirt bike is the engine. As a result, dirt bikes with larger capacity engines will weigh more than their smaller siblings. The Yamaha YZ 125 is identical in size to the Yamaha YZ 250. In fact, the Yamaha YZ 125 has a slightly taller seat height (see my post of dirt bike seat heights here). Yet, the YZ 250 weighs 227 lbs (103 kg) which is nearly 18 lbs heavier than the YZ 125’s 209 lbs (95 kg). This is solely thanks to the 250’s larger motor.

To put things into context, the average weight of all 50, 65, 85, 125 and 250 cc 2-strokes dirt bikes, and 250 and 450 cc 4-strokes are shown in the table below.

Dirt Bike (by engine)Average Weight (lbs)Average Weight (kg)
450 cc 4-stroke          249          113
250 cc 4-stroke          239          108
250 cc 2-stroke          228          103
125 cc 2-stroke          209            95
85 cc 2-stroke          162            73
65 cc 2-stroke          128            58
50 cc 2-stroke          104            47
Average weight of the different types of dirt bikes by engine size and type (2-stroke vs 4-stroke)

If you are unsure which dirt bike is best for you, please take note that there is more to it than the weight of the bike. To help you choose the right dirt bike for your experience level, build and intended use, check out this detailed post I wrote.

Why are Dirt Bikes so Light?

Dirt bikes are designed to go fast over rough terrain, be it a motocross track with huge jumps and whoops, or a forest single track littered with rocks and tree roots. To keep the weigh down, dirt bikes have very little accessories like lights, instruments, or kick-stands. Some dirt bikes don’t even have electric starters.

Another design feature to assist dirt bikes in off road riding and rough terrain is the long-travel suspension and big wheels. This increases a dirt bike’s ground clearance, but also raises the seat height (see more on dirt bike seat height here). Shorter riders often have trouble touching the ground with both feet on a dirt bike, but the light weight makes it easier to keep the bike upright.

And when you drop your dirt bike, which is not uncommon (even for experienced riders), you’ll be glad that it weighs much less than a similar-sized street bike.

How Can I Make My Dirt Bike Lighter?

While dirt bikes are generally very light already, there are a couple of things you can do to shed even more weight on your dirt bike.

The biggest weight saving that can be had is by replacing the factory exhaust with a lighter, aluminum or titanium exhaust. An aftermarket titanium exhaust can shave off more than a pound and increase the power and torque slightly. A free flowing aftermarket pipe will also eliminate the spark arrestor found in trail bikes. Just make sure it is legal to ride without a spark arrestor in your area.

Another weight saving modification is to replace your lead acid battery (if your bike has an electric starter) with a lithium battery. Lithium batteries, like this YTX-14 BS from Amazon, might be expensive, but they are smaller, much lighter and can hold a charge over winter without requiring a battery charger being hooked up.

Other weight saving tips include titanium bolt kits, lighter hubs (expensive and hard to find), and replacement race plastics. These are great ways to throw away money. Personally, I’d just replace the pipe and battery, and then eat less pork pies and cake. It is cheaper, healthier, and way more effective to go on a diet than to replace 1 oz parts here and there.

Conclusion

Dirt bikes are significantly lighter than any other type of bike. As a result, the weight of the bike should hardly be a deciding factor if you choose between different brands of dirt bikes. Make sure you consider your intended use and pick the bike with the right seat height, engine size and type (2-stroke vs 4-stroke), and suspension setup (race vs trail). Oh, and the one that looks coolest to you!

Happy riding!

Francois Steyn

I've been riding motorcycles since I was in school and have traveled thousands of miles on various bikes through more than 10 countries. For more info, check out my about page: https://adventurebiketroop.com/about-us/

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