Yamaha DT125 Specs and Review 2022

Yamaha DT125: The design is based on a well-known series of the 1960s “scramblers,” the Yamaha DT 125 is one of the Japanese company’s most durable line of products. The two-wheeled model might not be as strong as dirt bikes of 250cc.

ut don’t be fooled it is top of the line. In addition to its Enduro name, there are many more things to learn concerning this particular 125-cc wheeler, as you’ll soon discover in this article.

Yamaha DT125

The model was produced from 1974 to 2008 The Yamaha DT125 is considered a top learner bike by a lot of off-roaders and enthusiasts. 

With its aggressive Enduro style and hydraulic disc brakes and a motocross rear suspension, the bike is extremely efficient on the road as well as in the dirt.

Certain people (and reviews) consider the potential of the motorbike as the result of compromise. 

For those who placed their trust in the sleek and stylish ride, they discover the opposite to be the case. It is the Yamaha DT 125 never fails to meet the requirements of dependability and performance, whether it’s an excellent commuter or training motorcycle.

Yamaha DT125 Specs and Review

About Yamaha DT 125

It is the Yamaha DT 125 is a motorcycle made by Yamaha that dates back to the year 1968, which was the time that Yamaha released its AT-1 Enduro 125. 

The designation of the model “DT” indicates the bike is an off-road 2-stroke machine. The bike was first introduced into North America in 1974 as the DT125A and featured a cradle-like tubular steel frame, a raised exhaust, universal knobby tires, and a large ground clearance, which is common to the majority of Enduro motorcycles. 

Its entry into the U.S. market began with the year 1975’s Yamaha DT 125 until the DT125H model was launched in 1981. For non-U.S. regions, it was sold until the year 2008.

Updates & Restyles

The Yamaha DT 125 received multiple changes and modifications that were designed for specific markets. In 1977, the DT 125 was introduced with an asymmetric rear swingarm called a motocross suspension (a.k.a. MX). 

In 1984 the electrical components were changed from 6V into 12V and the YPVS (Yamaha Power Valve System) was added. 

At the same time, the drum brake on the front was changed to a disc operated by hydraulics, and the DT125LC was equipped with a rise-rate rear suspension.

1987 was the year of the overhaul of the brake system as Yamaha introduced the DT125R series that replaced standard drums for disc brakes on the rear. 

With the help of evolutionary modifications like this, many DT components such as the head, cylinder piston, rings air box, as well as exhaust (view at Amazon), was interchangeable with a different Yamaha motorcycle – that of the DT 175. 

If its previous restyles weren’t sufficient, this series launched the road version known by the name of DT 125 X at the beginning of 2000, which many owners have said is a joy to ride.

Yamaha DT 125 Specs & Features (1988 vs. 2005 Models) Engine

The major differences between these models are the 2mm increase in the size of carbs as well as the bore-stroke ratio and variations in compression ratios. 

While they’re barely noticeable they can increase speed ratings and power output in the range of 12.92 kW (17.33 horsepower) at 7,000 RPM according to Wikipedia. In addition, it is worth noting that the DT 125 initially had an air-cooled engine. 

However, it was changed to become a power mill that was liquid-cooled when the 1982 DT125LC and onward.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Engine Type 2-stroke
Cylinder Arrangement Reed valve, forward-inclined single-cylinder
Carburetion System Carburetor, Mikuni VM26SS x 1;
Mikuni TM28SS x 1 – ’99 onward
Carburetor, Mikuni TM28-92 x 1
Engine Cooling Liquid cooling
Engine Fuel Unleaded gasoline w/ at least RON 91 rating, containing < 5% MTBE (Methyl Tertiary Butyl Ether), < 10% ethanol, or < 5% methanol
Fuel Capacity 10 L/2.6 US gal (reserve – 1.8 L/0.48 US gal)
Bore x Stroke Ratio 56.4 x 50 mm (2.22 x 1.97 in);
56 x 50.7 mm (2.20 x 2.00 in) – ’89 onward
56 x 50.7 mm (2.20 x 2.00 in)
Compression Ratio 6.8:1 6.7:1
Displacement 124 cm³ / 7.6 in³
Horsepower 12 – 14 hp (8.9 – 10.2 kW) @ 7,000 RPM 14.7 hp (11 kW) @ 8,000 RPM
Maximum Torque 14 Nm (1.4 kgf-m, 10.5 ft-lb) @ 7000 RPM 13 Nm (1.3 kgf-m, 9.6 ft-lb) @ 8,000 RPM
Top Speed 68 mph (109 km/h) – advertised 75 – 80 mph (120.7 – 128.7 km/h) – owner’s claim 95 mph (153 km/h) – modded
Air Filtration Wet foam element
Lubrication Separate lubrication (Yamaha Autolube)
Engine Oil & Quantity 1.3 L/ US gal; 0.75 L/0.79 US quarts (transmission – change);
0.80 L/0.84 US quarts (transmission – overhaul)
SAE 10W-30 (transmission), Yamaha 2T (engine) 2-stroke oil or its equivalent
Alternatives: same-viscosity lube w/ API grade SJ+ meeting JASO MA standards

The most distinctive feature of this bike is the lubrication system. In lieu of the standard dry and wet sumps, the bike is equipped with an autolube container that is concealed behind the left-hand panel. 

The oil injection system controls what amount of oil that goes into the engine, based on the load on the throttle, thus reducing oil consumption and also stopping the plugin your spark from corroding during the process.

Drivetrain

The DT125 has a six-speed manual transmission as well as an electronic wet-clutch system with five plates. 

Helical gears as well as an O-ring chain of 428V (view the chain on Amazon) and an articulating taper roller and ball wheel steering, contribute to the bike’s stable performance and ease of use regardless of the terrain. 

The top two gears on the bike come with overdrive. The mechanics claim that changing this gearing up to 49/15T while riding the legal version of the lawful version permits a driver to reach speeds of 55 mph or more.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Steering System Ball and taper roller bearing
Clutch Wet multiple discs (left foot operation)
Transmission Type 6-speed constant mesh, return
Gearshift Pattern 1-down, 5-up
Final Drive #428V/DAIDO chain, 134 links (including joint) #428V2/DAIDO chain, 134 links (including joint)
Primary Reduction Ratio 3.227 (71/22)
Final Drive Ratio 2.235 (55/17) – ‘88; 3.118 (53/17) – CH; 3.563 (57/16) – ’89 onward 3.563 (57/16)
Transfer Gear Ratio Low – 2.833 (34/12)
2nd – 1.875 (30/16)
3rd – 1.412 (24/17)
4th – 1.143 (24/21)
5th – 0.957 (22/23)
Top – 0 .818 (18/22)

Ignition

As with many pre-’80s Yamaha bikes that were available, it was the Yamaha DT 125 originally had an electrical wiring harness that was 6V and an electronic CDI that brought the two-wheeler to. 

The ignition system was triggered magnetically. let the dirt bike generate a more rapid spark, which also reduced pollution of the plug that was caused by the gas and oil mixture inside the combustion chamber. 

Although the combo of 6V-CDI was adequate to power the machine, it would not allow it to operate legally on streets. Therefore, the wiring harness was upgraded to 12V at the time of 1984, and it has remained the same until.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Ignition Electronic CDI (Capacitor Discharge Ignition)
Ignition Timing 19° B.T.D.C @ 1,350 RPM – 3DB1;
17° B.T.D.C @ 1,350 RPM – 3NR1
17° B.T.D.C @ 1,500 RPM
Idle Speed 1,300 – 1,400 RPM 1,250 – 1,450 RPM
Spark Plug, Gap NGK BR9ES / NIPPON DENSO W27ESR-U, 0.7 – 0.8 mm (0.028 – 0.032 in) gap NGK BR8ES, 0.7 – 0.8 mm (0.028 – 0.032 in) gap
Tightening Torque 20 Nm (2.0 kgf-m, 14 lb-ft)
Generator Flywheel magneto A.C. magneto
Rated Output 13.3 – 15.3V @ 3,000 RPM 14V 170 W @ 5,000 RPM
Fuse (Main) 10 Amp 15 Amp
Starting System Kick & mesh type Electric starter
Battery 12V 3Ah/(10 HR) sealed, GM3-3B/FB3L-B formats 12V 6Ah/(10 HR) sealed, GT6B-3 format
Alternative: YTZ7S/YTX5L-BS formats
Battery Dimensions 98 x 56 x 106 mm (3.86 x 2.20 x 4.17 in) 114 x 71 x 106 mm (4.50 x 2.81 x 4.19 in) – GT6B-3/YTX5L-BS
113 x 70 x 105 mm (4.44 x 2.75 x 4.12 in) – YTZ7S

Tires & Brakes

Tubed rear and front tires that were mounted on wire-spoked chromed steel rims served as the original tires through the initial years on the DT 125. 

It wasn’t until the beginning of the decade that Michelin and Pirelli’s spokes tire were added to the then emission-compliant and street-friendly bike. The rear and front brakes were drums initially but were later upgraded to discs on. 

Although the brakes felt extremely precise in the dirt, they didn’t feel very grippy on asphalt. This is the reason why those rubber knobby tires come in to compensate for some of the problems with grip on roads.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Wheel Composition Wire-spoked, chromed steel Spoke
Front Tire Bridgestone TW25 2.75 x 21 4PR, tubed Michelin T63 80/90-21 48P or Pirelli Sport Demon 120/70-17 58H, tubed
Rear Tire Bridgestone TW44 4.10 x 18 4PR, tubed Michelin T63 110/80-18 58P or Pirelli Sport Demon 140/70-17 66H, tubed
Off-road/road air pressure (F/R) 130 – 150 kPa (1.3 – 1.5 kgf/cm2, 18 – 22 psi) / 150 – 180 kPa (1.5 – 1.8 kgf/cm2, 22 – 26 psi) 150 – 180 kPa (1.5 – 1.8 kgf/cm2, 22 – 26 psi) / 175 – 200 kPa (1.7 – 2.0 kgf/cm2, 25 – 29 psi)
Rim Size (F/R) 1.60 × 21 / 1.85 × 18 1.60 × 21 / 1.85 × 18 – DT125RE;
3.00 x 17 / 3.50 x 17 – DT125X
Tread Depth Limit 1 mm (0.04 in) 1.6 mm (0.04 in)
Front Brake Type Hydraulically operated, 230-mm single disc brake (right-hand operation) Hydraulically operated, 230-/298-mm single disc brake (right-hand operation)
Rear Brake Type Hydraulically operated, 230-mm single disc brake (right foot operation) Hydraulically operated, 220-mm single disc brake (right foot operation)

Suspension

The first designs of the DT125 featured front forks and two rear shocks. The situation changed in 1977, as the bike was designed with a single-shock rear part also known as a motocross suspension (the identical ones that are found in Yamaha YZ racing bikes). 

The setup was comprised of a swingarm that was cantilever-style and a long hydraulic shock made of de-carbon that ran through the head of the steer. 

The new suspension gives an attractive appearance however, it also allowed great absorption of bumps and dips. 

Additionally, the nitrogen-fed gas shock decreased the chance of the suspension falling to the bottom out.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Rake, Trail 27.5°, 113 mm (4.45 in) 27º, 107 mm (4.21 in) / 24.5°, 73.1 mm (2.88 in)
Turning Radius 2.1 m (6.9 ft) 2.1 m (6.9 ft) / 2 m (6.6 ft)
Ground Clearance 315 mm (12.4 in) 300 mm (11.8 in) / 271 mm (10.7 in)
Wheelbase 1,415 mm (55.7 in) 1,415 mm (55.7 in) / 1,396 mm (55 in)
Front Suspension Type, Travel Telescopic fork w/ oil-damped Coilover shocks, 270 mm (10.6 in) Telescopic fork w/ oil-damped Coilover shocks, 270 mm (10.6 in); 200 mm (7.87 in) – DT125X
Rear Suspension Type, Travel Swingarm (motocross suspension) w/ oil-damped gas shocks, 260 mm (10.2 in) Swingarm (link suspension) w/ oil-damped gas shocks, 260 mm (10.2 in); 230 mm (9.05 in) – DT125X

Dimensions & Capacities

The overall dimensions varied based on the year of the model and the region in which the dirt bike was advertised. 

The models offered across Sweden or Finland were about two inches wider than those sold in North America. The DT125X was 12 inches longer as well as 17lbs heavier than other models. 

Despite these differences in payload, the capacity of the various models differed only by two kilograms.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Length 2,160 mm (85 in); 2,250 mm (81.1 in) – SW/D/CH; 2,285 mm (82.4 in) – FI; 2,170 mm (85.4 in) – ’99 onward 2,210 mm (87 in) / 2,139 mm (84.2 in)
Width 830 mm (32.7 in) 795 mm (31.3 in) / 1,121 mm (44.1 in)
Height 1,255 mm (49.4 in) 1,200 mm (47.2 in)
Seat Height (Unloaded) 885 mm (34.8 in) 900 mm (35.4 in) / 886 mm (34.9 in)
Curb Weight 119 Kg (262 lbs); 127 Kg (219 lbs) – ’99 onward 126 Kg (278 lbs) / 134 Kg (295 lbs)
Payload Capacity (F/R) 47 Kg (104 lbs) / 134 Kg (295 lbs) 178 – 180 Kg (392 – 396 lbs)

Exterior

It is comprised of a semi-double-cradle steel frame, and body panels of plastic with a variety of colors. 

Seats for the saddle are wide and are able to comfortably accommodate two people if required. High-clearance fenders give splash and mud protection and allow for taller tires to fit the wheels. 

Early models featured an outdated dash, with an old-fashioned speedometer (view on Amazon) and a trip meter/tachometer, and a grid to hold oil. Dash design was updated to make it more modern but still has the same elements. 

The other standard features are handgrips and handlebars and a full set of lighting and the trumpet.

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Frame Semi-double cradle
Body Material Plastic
Front/Rear Fender Flares Standard
Upper/Lower Fairing N/A
Chain Guards Standard
Fork Guards N/A
Skid Plate
Stand Type Side stand (no center stand)
License Plate N/A

Lighting

1988 – 2002 Yamaha DT125R 2005 Yamaha DT125RE / DT125X
Headlight 12V 45/40 W x 1 Halogen H4 bulb-type, 12V 60/55 W x 1
Parking Light/Stoplight 12V 4 W x 1 N/A
Brake/Taillight 12V 21/5 W x 1
Flasher Lights 12V 21 W x 4
Indicator Lights 12V 21 W (turn signal), 3.4 W (meter, auxiliary), 3 W (neutral, high-beam, oil, license, warning lamps) 12V 10 W (turn signal), 12V 3 W (oil, neutral, high-beam, low-beam, license), LED (meter)

Yamaha DT 125 Price

Based on Nada Guides’s research, the original price of the Yamaha DT 125 was $825. The price increased to $6,249-$6,479 in the two final seasons of manufacturing (at the time when the DT125RE and the DT125X had already been available on the marketplace). Pricing for resales however ranges in the $730-$2,925 range. 

For DT125s previously owned the models pre-1978 and post-1988 tend to be the most. Other models outside of these model years can be purchased at less than $900.

Yamaha DT 125 Pros and Cons

Yamaha DT 125 Pros and Cons

Despite its rock-solid construction and its proven reliability, however, the DT 125 is far from being perfect. There are a few things to consider if you decide to buy this two-wheeler

Pros:

  • Retro aesthetics
  • A large saddle seat that provides riding comfort perhaps, for two or more riders
  • A simple bike that has only the most essentials
  • Monocross rear suspension offers excellent handling of bumps and ruts
  • A comfortable high-riding position and simple cruising controls
  • High-rise fenders that provide important splash protection and mud
  • Maintenance is reduced due to the simplicity of mechanical components
  • Unbelievable aftermarket support and access to affordable service

Cons:

  • There is no built-in storage.
  • Brakes don’t perform as well on asphalt as they do in the dirt.
  • The car may feel like it is being snatched away when driving at low RPMs, particularly when in traffic
  • Not the best option for travel or a long period of riding.
  • The instrumentation is not complete – it is not equipped with an indicator for the rev counter
  • The issues listed below: transmission problems that keep stalling and misfiring repeatedly, a restricted revving speed, as well as rattling within the exhaust manifold

While valid, issues like the engine’s performance fluctuating and being trapped in the engine are typically related to the level of care that is given to the bike. Stalling is one example.

It is usually traced back to a clogged spark plug and could mean the honest mistake of forgetting or the inattention to periodic inspections and maintenance. 

Similar to that, problems with the clutch levers that fail to disengage are usually caused by worn or damaged discs or defective clutch levers, which is typically an indication of the age of the bike.

About Yamaha

In 1887, the company was founded. Yamaha Motor Company Limited traces its humble beginnings to music. It was a manufacturer of pianos and organs with reeds. 

Its Yamaha DT 125 maker eventually began to enter the auto industry by entering into the manufacturing of motorcycles. The company broke up with the parent company in the year 1955 and has made massive advancements in the production of vehicles powered by motors. 

The Japanese company is renowned for its unbeatable water vehicle sales as well as for its pioneering work in the ATV industry.

Conclusion – Yamaha DT 125 Review

Old-fashioned dirt bikes, like that of DT 125 do not require the power of a supermoto to ride effortlessly on or off the road. A simple bike is more effective in giving the riders an unforgettable outdoor experience. 

The DT125 is a great choice as fewer problems can arise since it has only the basics and that’s all you’ll need to go through mud and stones or ride on tarmac roads with confidence. 

When you’re on the road or spending time with friends, you’re sure to enjoy good acceleration and grip and unrelenting performance from this motorcycle. The Yamaha DT125 is an iconic bike that is impossible to pass up!

How much does a Yamaha DT 125 cost?

Yamaha DT 125 Price

The price increased from $6,249 to $6,479 during the final manufacturing year (when the DT125RE and the DT125X had already been launched on the marketplace). The price for resales, on the other hand, is between $730 and $2,925.

Is the Yamaha DT street legal?

The 1997 Yamaha DT 125 is an entry-level, road-legal, off-road vehicle that could be used as the daily commute to work and back.

When did Yamaha stop making dt125?

Yamaha DT125R: First introduced back in 1988 (but the engine was in use for a long time before that), It brought millions of new riders motorcycling. The current versions are updated versions of the R model. However, much, including the engine, remains the same. It was discontinued in 2004.

Is Yamaha DT a good bike?

Yamaha Kenya

The DT 125 is a bike that you can count on. It’s a bike with plenty of torque usable and a powerful acceleration feel and light agile handling—Ndagitari Chege and 106 more like this.

What does Yamaha zinger mean?

RM- Racing Model. Yamaha Zinger. Yamaha Zinger ( another term for two strokes), or at least that’s what I’ve been told. SX- Supercross. EXC- Enduro Cross Country.

Whats the difference between YZ and WR Yamaha?

Its YZ suspension is better suitable for faster riding. However, the WR features identical units with a more simple setup. Its WR motor is similar to the one found in the YZ with the same piston, cam, and timing, but it has a wider-ratio gearbox.

What years did they make the Yamaha 4 zinger?

1986 4-Zinger

It was also the very first 60cc Yamaha 4-wheel ATV. The 4-Zinger had shaft drive, variable speed limiters, and an emergency stop button. Parents could easily alter the engine speed and operate the device as the rider progressed in their experience.

Is a TT-R230 a good trail bike?

For those with the right height, the right level of skill, and reasonable performance expectations, The 2017 Yamaha TT-R230 is an excellent motorcycle. It is extremely reliable and simple to drive; it’s exactly what a great trail bike should be.

Is a Yamaha TTR 230 a good beginner bike?

The Yamaha TT R230 is a fantastic beginner bike for beginners. It’s quiet, reliable with a proven track history, and, with some modifications, it gives the possibility of growing as your riding skills improve.

What kind of gas does a Yamaha TTR 230 take?

Yamaha suggests regular unleaded gasoline to the U.S. TTR230 model. TTR230.

Yamaha DT125 FAQ

1. Is Yamaha DT125 good?

The model was produced from 1974 until the year 2008, the Yamaha DT125 is regarded as to be an excellent motorcycle for beginners by many off-roaders as well as enthusiasts. With its aggressive Enduro design hydraulic disc brakes and an out across rear suspension, The bike is a great performer on the roads and on dirt.

2. Is the Yamaha DT street legal?

The 1997 Yamaha DT 125 is a low-cost, road-legal off-road vehicle that could just be used as an everyday commute to work and back.

3. What do I mean by motorcycles?

We’re often asked to clarify the model year on bikes. Then we’re challenged by a year on the bicycle is not identical to and the certificate of registration indicates an alternate year. This will help to clarify some misunderstandings. WHAT IS MODEL YEAR? Most often abbreviated to MY it is determined by the manufacturer who produces.

4. Is it a 125cc A 2 stroke?

A completely revised liquid-cooled two-stroke engine with 125cc capacity has increased the mid-and top-end of power over the 2021 model.

5. What does Yamaha TTR stand for?

Posted October 24, 2006. Various Yamaha Acronyms: Time To Ride.

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