Yamaha TTR 125 Dirt Bike Specs & Review

A wide range of exciting features makes the Yamaha TTR 125 an ideal beginner 4 stroke dirt bike.

The Yamaha TTR125 has been a popular choice for riders around the world. I’ve owned one, so has my father, and my cousin. With all this first hand experience riding the Yamaha TTR 125, I thought I would share a detailed review and guide you through the specs and changes that have taken place to improve this fan favorite dirt bike.

Yamaha TTR 125 Introduction

The Yamaha TTR 125 was first produced in 2000 as a direct competitor to the Honda XR 100 which was my first ever dirt bike. Both of these bikes were designed as a mid-sized stepping stone dirt bike for beginner riders. Both manufacturers have continuously improved upon old models and released new models, the main rival of the TTR 125 is now the Honda CRF 125F.

The TTR 125 is a 4 stroke beginner dirt bike. The setup is tailored to be easier to ride than it’s YZ 125 motocross counterpart. It offers riders a lower seat height, softer suspension settings along with a lower end performance engine. All these factors make the TTR 125 an ideal beginner 4 stroke dirt bike.

Yamaha TTR 125 Specs

Below I go into some detail around the main specs. Scroll to the bottom to see the full specs in table form.

Yamaha TTR 125 Seat Height

When choosing which dirt bike to buy, pay careful attention to the seat height. Particularly when buying a bike for a new rider. A bike that sits too tall will be difficult to reach the ground with a safe flat foot when stopping or maneuvering.

Buying a bike that’s too small will result in an uncomfortable ride. Although smaller bikes are easier to handle, they’re not set up for optimal riding pleasure or performance. If you’re looking at buying the bike for a youngster that is still expected to grow, it’s worth buying a bike that’s slightly too big, allowing the rider to grow in comfort as their size grows into the bike. The Yamaha TTR 125 has a seat height of 30.5 inches.

Yamaha TTR 125 Engine Power

It’s a terrible idea for beginners to start on a dirt bike with too much engine power. It’s hard to control and difficult to practice on. Abike with too much power will scare a new rider from riding and possibly even scare a new rider away from dirt bikes completely. The Yamaha TTR 125 is a perfect bike to learn on. I know many riders that still ride the TTR 125. It’s amazing how much skill plays a role in speed vs actually engine performance. Give a pro a TTR 125 and he’ll probably still beat me on KTM 300.

The Yamaha TTR 125 is a single cylinder, four-stroke enduro dirt bike with maximum torque of 6.64 ft/lbs (9.0 Nm) @ 6500 RPM. Yamaha claims the max horsepower is 9.39 HP (7.0 KW) @ 9800 RPM.

Yamaha TTR 125 Handling

Yamaha_TTR125

While the TTR 125 may not be the best in its class at handling, speed, or performance, it certainly doesn’t leave anything on the table. As a new rider the TTR 125 is a great option. It offers a low down center of gravity which helps in the tight twisty corners. To add to the agility, the wheelbase is short which helps to create a tight turning circle.

You can make some big handling improvements by fine tuning your suspension over the stock setup. You might also consider making some small changes to get the bike feeling just right for the rider. For example, the handlebars could be rotated forward or back depending on rider height, or completely swapped for a better set of bars. You could also change the position of the clutch and front brake making it feel more comfortable for the rider.

Yamaha TTR 125 Suspension

As with most beginner dirt bikes, the TTR 125 is lacking in the suspension department. Although, if you’re a beginner rider, you’re not going to be able to notice the difference between entry level and pro level suspension. The same can be said for ultra lightweight riders.

New riders that are not too aggressive on the bike will find that the softer spring rate and valving works perfectly fine on the TTR 125 and 125LE. Although more serious riders should consider upgrading the forks and shocks.

Yamaha TTR 125 Brakes

One of the key differences between the TTR 125 and 125LE model is the brakes. The TTR 125 has the old school drum brakes on both the front and rear. The drum brakes are more than enough stopping power for beginner riders. Make sure to check the brakes are not worn, have not been sprayed with any kind of lubricant, and that they have been setup correctly. The 125LE models come standard with front disc brakes. Disc brake offer a substantial advantage over drum brakes. The same logic applies – make sure the setup is correct and that the brakes have no oil, dirt, or lubricant on them.

Yamaha TTR 125 Jetting

Ensuring that the jetting has been fine tuned will make a massive difference to the performance of the Yamaha TTR125. The stock carburetor is not the strongest selling point of the TTR125. You will need to do some fine tuning to make sure the bike is not running too rich or too lean.

Yamaha TTR 125 Granny Gear Transmission

What makes this bike so good for beginner riders is the extremely short first gear. For advanced riders, first gear is almost useless on this bike. But, for beginners, having a very short gear helps with practicing gear changes which is arguably one of the most important foundational skills to learn on a dirt bike. A short first gear also means that you don’t need to allow the clutch to ride too far before getting the bike rolling.

After enough practice with the short first gear, you could swap out the small front sprocket for a slightly larger one which will help to extend the range of the first couple of gears.

Yamaha TTR 125 Model Differences

Yamaha TTR 125

This is the baseline model.

  • 17/14″ wheel and tire size
  • Drum brakes front and rear
  • 30.5″ seat height
  • Kick-start only

Yamaha TTR 125E

Baseline model + electric start

  • 17/14″ wheel and tire size
  • Drum brakes front and rear
  • 30.5″ seat height
  • Electric start

Yamaha TTR 125L

Larger than baseline + improved brakes

  • 19/16″ wheel and tire size
  • Front disc brake, drum rear
  • 31.7″ seat height
  • Kick-start only

Yamaha TTR 125LE

Larger than baseline + improved brakes + electric start

  • 19/16″ wheel and tire size
  • Front disc brake, rear drum
  • 31.7″ seat height
  • Electric start with battery

Read more on the Yamaha website

Yamaha TTR 125 Spec Comparisons

Yamaha TTR 125 Vs Honda CRF 125f

Honda CRF125F vs Yamaha TTR125
SpecYamaha TTR125 SpecsHonda CRF125F Specs
Displacement124cc124.9cc
Bore and Stroke54.0mm x 54.0mm52.4mm x 57.9mm
Compression Ratio10.0:19.0:1
Spark PlugNGK CR7HSANGK CPR6EA-9
Valve ClearanceIN: .003″ EX: .004″IN: 0.004″ / EX: 0.006″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilotKeihin PD20 (PDB4BA) / 112 main / 38 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8753.181 / 1.705 / 1.238 / 0.916
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.0 US quart (refill)/ 1.1 quart (rebuild) / SAE 10W-40
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)428 / 13T/46T / 13T/49T (FB-Model)
Front tire size70/100-17 / 70/100-19 (L model)70/100-17 / 70/100-19 (FB model)
Rear tire size90/100-14 / 90/100-16 (L model)90/100-14 / 90/100-16 (FB model)
Seat height30.5 inches28.9 inches / 30.9 inches (FB model)
Wheel Base50 inches48.0 inches / 49.4 inches (FB model)
Weight198 lbs192 lbs. / 194 lbs. (FB model)

Yamaha TTR 125 Vs Kawasaki KLX140

Kawasaki KLX140 vs Yamaha TTR 125
KLX140L
SpecYamaha TTR125 SpecsKawasaki KLX140 Specs
Displacement124cc124cc
Bore and Stroke54.0mm x 54.0mm57.0mm x 48.8mm
Compression Ratio10.0:19.5:1
Spark PlugNGK CR7HSANGK DR8EA
Valve ClearanceIN: .003″ EX: .004″IN: .003″ EX: .005″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilot20mm Mikuni / 102.5 main / 17.5 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8753.00 / 1.857 / 1.368 / 1.095 / 0.923
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.0 US Quart / 10W-40
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)#428; 14T/51 / 14T/57T (L model)
Front tire size70/100-17 / 70/100-19 (L model)70/100-17 / 70/100-19 (L model)
Rear tire size90/100-14 / 90/100-16 (L model)90/100-14 / 90/100-16 (L model)
Seat height30.5 inches30.5 inches / 31.7 inches (L model)
Wheel Base50 inches49 inches / 50 inches (L model)
Weight198 lbs194 lbs. / 196 lbs. (L model)

Yamaha TTR 125 Vs Honda CRF150F

Honda CRF150F vs Yamaha TTR 125
SpecYamaha TTR125 SpecsHonda CRF150F Specs
Displacement124cc149cc
Bore and Stroke54.0mm x 54.0mm57.3mm x 57.8mm
Compression Ratio10.0:19.5:1
Spark PlugNGK CR7HSANGK CPR8EA-9
Valve ClearanceIN: .003″ EX: .004″IN: .003″ EX: .005″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilot24mm Keihin / 90 main / 40 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8752.786 / 1.875 / 1.409 / 1.120 / 0.938
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.3 US Quart / 10W-30
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)#520 O-ring-sealed chain; 13T/48T
Front tire size70/100-17 / 70/100-19 (L model)70/100-19
Rear tire size90/100-14 / 90/100-16 (L model)90/100-16
Seat height30.5 inches32.5 inches
Wheel Base50 inches52.3 inches
Weight198 lbs236 lbs.

Yamaha TTR 125 Vs CRF100F (XR100)

Honda CRF100F (XR100)  vs Yamaha TTR 125
SpecYamaha TTR125 SpecsHonda CRF100F (XR100) Specs
Displacement124cc99.00cc
Bore and Stroke54.0mm x 54.0mm53.0 x 45.0 mm
Compression Ratio10.0:19.4:1
Spark PlugNGK CR7HSANGK CR6HSA
Valve ClearanceIN: .003″ EX: .004″IN: .002″ EX: .002″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilot22mm Keihin / 92 main / 35 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8753.083 / 1.882 / 1.400 / 1.130 / 0.923
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.06 US quarts/10W-40
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)#428 chain; 14T/50T
Front tire size70/100-17 / 70/100-19 (L model)2.50-19
Rear tire size90/100-14 / 90/100-16 (L model)3.00-16
Seat height30.5 inches30.9 inches
Wheel Base50 inches49.4 inches
Weight198 lbs174 lbs.

Yamaha TTR 125 Vs Kawasaki KLX 110 (Suzuki DRZ 110)

Kawasaki KLX 110 vs Yamaha TTR 125
KLX110
Suzuki DRZ110 vs Yamaha TTR125
SpecYamaha TTR125 SpecsKawasaki KLX110 (Suzuki DRZ110) Specs
Displacement124cc112cc
Bore and Stroke54.0mm x 54.0mm53.0 x 50.6mm
Compression Ratio10.0:19.5:1
Spark PlugNGK CR7HSANGK CR6HSA
Valve ClearanceIN: .003″ EX: .004″IN: .002″ EX: .003″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilot18mm Mikuni / 80 main / 38 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8753.273 / 1.938 / 1.350
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.12 US Quarts / 10W-40
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)#420 / 14T / 37T
Front tire size70/100-17 / 70/100-19 (L model)2.50-14
Rear tire size90/100-14 / 90/100-16 (L model)3.00-12
Seat height30.5 inches26.8 inches / 28.7 (L model)
Wheel Base50 inches42.3 inches
Weight198 lbs168 lbs.

Yamaha TTR 125 Vs Kawasaki KLX 125 (Suzuki DRZ 125)

Suzuki DRZ125 vs Yamaha TTR125
Kawasaki KLX125 (Suzuki DRZ125) vs Yamaha TTR 125
SpecYamaha TTR125 SpecsKawasaki KLX125 (Suzuki DRZ125) Specs
Displacement124cc124cc
Bore and Stroke54.0mm x 54.0mm57.0mm x 48.8mm
Compression Ratio10.0:19.5:1
Spark PlugNGK CR7HSANGK DR8EA
Valve ClearanceIN: .003″ EX: .004″IN: .003″ EX: .005″
Carb/main jet/pilot jet20mm Mikuni / 100 main / 15 pilot20mm Mikuni / 102.5 main / 17.5 pilot
Transmission ratios2.643 / 1.778 / 1.316 / 1.045 / 0.8753.00 / 1.857 / 1.368 / 1.095 / 0.923
Oil Capacity/Type1.27 US Quart / 20W-40 (40° F and above)1.0 US Quart / 10W-40
Chain size/front sprocket/rear sprocket#428; 13T/49T / 13T/54T (L model)#428; 14T/51 / 14T/57T (L model)
Front tire size70/100-17 / 70/100-19 (L model)70/100-17 / 70/100-19 (L model)
Rear tire size90/100-14 / 90/100-16 (L model)90/100-14 / 90/100-16 (L model)
Seat height30.5 inches30.5 inches / 31.7 inches (L model)
Wheel Base50 inches49 inches / 50 inches (L model)
Weight198 lbs194 lbs. / 196 lbs. (L model)

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