YAMAHA DT125X (2004 - 2007) Review

Highlights

  • Hilarious 125cc supermoto
  • Suitable for riding on a CBT with L-plates in restricted form
  • A hit with owners and reviewers alike

At a glance

Owners' reliability rating: 4.7 out of 5 (4.7/5)
Power: 15 bhp
Seat height: Tall (34.9 in / 886 mm)
Weight: Low (269 lbs / 122 kg)

Overall rating

Next up: Ride & brakes
4 out of 5 (4/5)

The Yamaha DT 125 X was the last version of Yamaha’s long-running DT series before its two-stroke engine finally gave way to the four-stroke motors in bikes like the XT125X and the WR125X. The X in Yamaha's range represents supermoto.

This means the bike is built on an off road platform but with stiffer suspension, a smaller front wheel, better brakes and road tyres.

Lightweight, ridiculously agile and easy to ride, it makes learning (or commuting) huge fun. It’s not for off-roading (get an RE version for that) but for Tarmac-based 125cc antics, the Yamaha DT 125 X is hard to beat.

Ride quality & brakes

Next up: Engine
5 out of 5 (5/5)

Tall, upright and commanding, the Yamaha DT 125 X is perfect for town riding and (slowish!) twisties. Long travel suspension soaks up bumps and lumps while good, firm brakes will safely bring to you a halt.

The handling’s the best bit though: throw the motorcycle around and it’ll respond brilliantly. The sharp steering’s a dream. Very stable.

Engine

Next up: Reliability
4 out of 5 (4/5)

The Yamaha DT 125 X's proven two stroke single’s been driving these little motorcycles around for donkey’s years. Simplistic but it does the job.

Restricted learner motorcycles can still be fun but remove the restrictors and you’ll have a revvy bundle of laughs on your hands. Minor flat spot in the midrange and keep on the gears for ultimate performance. Electric start, carbed and reliable.

Like all two-stroke engines, it will eventually need some attention or even a full rebuild. Power valves can have been stuck open by owners believing they were getting more power by modifying them so listen out for the sound of it opening and closing when you switch on the ignition.

Reliability & build quality

Next up: Value
4 out of 5 (4/5)

Methuselah probably rode a Yamaha DT 125 in his teens, they’ve been around that long, so worries about reliability or durability are unfounded.

Yamaha's DT125X is proven, easy to work on, solid and simple. Lack of frills means lack of fuss and fewer things to go wrong. Usual wear and tear but check exhausts and frames for chipping paint and early rust.

Check out our Yamaha DT 125 X owners' reviews to find out what real-world riders reckon to this hilarious supermoto.

Value vs rivals

Next up: Equipment
4 out of 5 (4/5)

Cheap to buy, insure and run, the Yamaha DT125X (and its RE brother) represent great value, either as learner motorcycles or trusty commuters.

Parts are easy to source, relatively inexpensive and the machines are simple to work on. Aprilia’s MX125 is a serious rival, however, and has a pretty flash spec, too.

There are plenty of modern four-stroke 125s for learners to choose from these days, including Yamaha's own MT-125, YZF-R125 or most recent retro XSR125.

Or if you're looking for an economic urban mobility solution to beat city traffic on the way to work, a Super Soco TC Max is worth a look too.

Equipment

3 out of 5 (3/5)

The Yamaha DT 125 X is a basic motorcycle but that’s part of its charm. Tall seat (which is a mite uncomfortable) and wide bars help manoeuvrability: the turning circle’s tiny.

The dash is pretty old-fashioned but it all works: analogue speedo and trip, big light grid for oil etc but no rev counter or fuel light. Mirrors work effectively but the choke’s on the carb making it hard to reach when you’re riding.

Specs

Engine size 124cc
Engine type Single cylinder two-stroke, 6 gears
Frame type Steel diamond
Fuel capacity 11 litres
Seat height 886mm
Bike weight 122kg
Front suspension None
Rear suspension Preload
Front brake 298mm disc
Rear brake 230mm disc
Front tyre size 120/70 x 17
Rear tyre size 140/70 x 17

Mpg, costs & insurance

Average fuel consumption 60 mpg
Annual road tax £21
Annual service cost -
New price -
Used price -
Insurance group 6 of 17
How much to insure?
Warranty term Two year unlimited mileage

Top speed & performance

Max power 15 bhp
Max torque 7 ft-lb
Top speed 65 mph
1/4 mile acceleration -
Tank range 145 miles

Model history & versions

Model history

  • 2004: Yamaha DT125X launched at the end of the year, a few months after the birth of the RE motorcycle. 
  • 2007: Bike goes off sale.

Other versions

  • Yamaha DT125RE: The current, off-road biased version with very similar spec to the X. Differences include a higher seat, traillie-style wheels and knobbly tyres, smaller brake discs and price (it’s marginally cheaper).
  • Yamaha DT125R: Introduced in 1988 (but the engine had been around long before then), it launched a million new riders in to motorcycling. Current versions are updates of the R model but much, including the engine, is the same. Discontinued in 2004.

Owners' reviews for the YAMAHA DT125X (2004 - 2007)

6 owners have reviewed their YAMAHA DT125X (2004 - 2007) and rated it in a number of areas. Read what they have to say and what they like and dislike about the bike below.

Review your YAMAHA DT125X (2004 - 2007)

Summary of owners' reviews

Overall rating: 5 out of 5 (5/5)
Ride quality & brakes: 4.8 out of 5 (4.8/5)
Engine: 5 out of 5 (5/5)
Reliability & build quality: 4.7 out of 5 (4.7/5)
Value vs rivals: 4.5 out of 5 (4.5/5)
Equipment: 3.7 out of 5 (3.7/5)
5 out of 5 Relatable, quick fun!
13 April 2014 by Leighj0121

This bike is very quick for a 125, and also loves to do the wheelies so has a nice amount of power, pretty good on fuel, sounds good for a two stroke and the best thing is driving in the night with the blue dashboard light looks absolutely gorgeous and reminds you why you love it! 5**

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5
Value vs rivals 5 out of 5
Equipment 4 out of 5
5 out of 5 Stylish, Quick and good engine...
14 August 2011 by dewcati

Since owning this bike, I have had many compliments from friends and people I've never met before saying it looks good and looks the part. It is also very fast! Off the line I beat most cars and also a beaten one or two 600's. Only problem is they soon catch up as the top end speed isn't much 75 - 80 mph. But on country roads, you'll have no trouble keeping up with other bikes or cars :D amazing bike strongly recommend to anyone.

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 4 out of 5
Value vs rivals 5 out of 5
Equipment 3 out of 5
5 out of 5 amazing first or second bike specially if stillon L's
09 June 2008 by wolfrace999

i bought a DTX brand new on a '57 plate never had a single problem with it exept once the battery went dead handles amazingly and will easily out corner any big race style bike due to its weight and rider poition all the things such as restricter in the carb and the green wire to a realy behind the clocks are not on the newist version all i did to mine was open up the YPVS by ajusting the cables form the servo, fitted a DEP exaust system (which removes the cat) and fitted a 17 sprocket to the front does a v.easy 80 but will reach 100 just if u kill 5th and 6th will get up to about 90 - 95 with 2 people on both with heads down of corse but for a little bike thats amazing beats a new ford focus ST off the lights as well as beating a subaru impretza wrx sti up to about 60 -70 mph highly reccomended - will rinse RS 125 / NSR 125's all day - four stroke 125's neva have a chance beats them without even revvin to band

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5
Value vs rivals 4 out of 5
Equipment 3 out of 5
5 out of 5 Excellent little 2 stroke 125cc.
01 March 2008 by bob_the_log

I have owned my DT 125 RE for 2 months months now. Love every second. I fitted a DEP front and rear pipe. Fitted a bigger carb jet and earthed the green wire in the clocks (this lets the power valve open fully) and it flys. Had 80 mph. I love my little DT. I am a 6' 2" and this bike is excellent and it's got a real big bike feel. The bike is very quick off the mark and very good top end. I used to own a honda clr 125 4 stroke. It was slow and dull. This just blows the socks of it. You have a big smile every time you jump on it and open that throttle. Very easy to work on. They say that 2 strokes are unreliable and expensive to run but it is well worth it. The only minor points are the seat is ver uncomfortable on long run. After an our you get a numb bum. Also 2 stroke oil is very expensive. Well the good stuff is. Also I have off road syle tyres on and it feels a little bit twitchey going around tigt bens (what do you expect, there made for dirt and not tarmac). I just love the noise it makes and the way it goes. Don't think about it and just get one. You will not be disapointed.

Ride quality & brakes 4 out of 5
Engine 5 out of 5
Reliability & build quality 4 out of 5
Value vs rivals 4 out of 5
Equipment 4 out of 5
5 out of 5 Excellent first road bike or commuter, saddle and speed limit it's usefulness for longer trips.
10 August 2006 by andrewward

Like all two strokes the power lives high up the RPM range. Acceleration is good - getting the bike promptly up to 50-60 mph - albeit with frequent gear changes to keep it in the power band. The large tyres give good grip in all conditions, and inspire confidence taking corners at speed. Electric start never fails to fire the engine up within a second or two, even when left for a while. I've now moved on to a bigger bike, but only as i've started commuting on out-of-town roads. If I was only using the bike around town I wouldn't think of buying anything else. Strengths: Handling excellent, rock steady at high speed. Reliability. Styling. Fuel economy (80-100 miles on 6 litres of petrol). Weaknesses: One or two spots of rust on the frame despite being garaged and carefully cleaned after riding in the wet, although I had no problems with the exhaust paint. Slightly snatchy at low revs when crawling in traffic. Uncomfortable seat if ridden for more than an hour, and slightly underpowered for out-of town riding (drops back to 50-55 mph up hills with traffic bunching up behind).

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5
Value vs rivals 4 out of 5
Equipment 4 out of 5
5 out of 5 Great fun, great handling, great fuel economy
29 December 2005 by taffmahoney

I have owned this bike for a few months and the initial 'new bike' feeling has now subsided. The bike feels very responsive and performance is surprisingly good for such a small engine. I use it for commuting and the rush hour traffic is now non-existent. Slow riding control is easy with this bike, even thought the gear box is a bit clunky. I chose this over the XT125X as the 2 stroke engine is much nicer and more fun to have and the power delivery is very good. Riding at 60mph is hard work due to the wind, but it is okay for short bursts. Strengths: The bike feels stable and braking is fantastic due to large disc up front and road tires. Nice high riding position. Fuel economy is really good (about 60mpg). Cheap parts, cheap servicing and loads of after-market accessories. You could de-restrict it to get the full 22bhp if you wanted to. Weaknesses: Uncomfortable seat - takes a bit of getting used to. No storage at all. Bit pricey for a 125. No rev counter. Exhaust needs looking after due to crappy paint pealing off after only 100 miles.

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5
Value vs rivals 5 out of 5
Equipment 4 out of 5
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