2020 Motorcycle Previews 2020 Yamaha YZ125X First Look (17 Fast Facts)

2020 Yamaha YZ125X First Look (17 Fast Facts)

2020 Yamaha YZ125X First Look: GNCC Racing Motorcycle

The resurgence of two-stroke off-road motorcycles continues with the 2020 Yamaha YZ125X. Based on the long-running Yamaha YZ125 motocrosser racer, the 2020 Yamaha YZ125X hits the GNCC and hare scrambles cross-country courses with a motor and chassis tuned to off-road racing.

Let’s take a look at what makes the 2020 Yamaha YZ125X suited to off-road racing away from motocross circuits.

2020 Yamaha YZ125X Review1. The 125cc motor has smoother power for the longer, technical GNCC courses. The little tiddlers can be screamers with narrow powerbands, but Yamaha didn’t go that route with the 2020 YZ125X. The YZ125X gets its own power delivery characteristics.

2. The YZ125X has its a unique power valve shape. The timing and duration of the power valve operation are optimized for off-road racing.

3. Yamaha gives the 2020 YZ125X a new cylinder head. The lower-compression head had a unique combustion chamber shape, to make the two-stroke more rideable.

4. The CDI gets digital settings to smooth out the power and widen the powerband.

5. A terrain-resistant sealed O-ring chain sends the power to the rear sprocket.

2020 Yamaha YZ125X test6. For off-road racing, the YZ125X gets off-road wheels and tires. That means an 18-inch rear wheel, and Dunlop Geomax AT81 rubber. Both tires on the YZ125X are 10mm wider than the Dunlops on the YZ125.

7. We all like KYB’s fully adjustable speed-sensitive suspension, and the 2020 Yamaha YZ125X has it. As you’d expect, the YZ125X’s suspension settings are softer than the MX-friendly YZ125.

8. The wheelbase on the 2020 YZ125X is a half-inch longer than the YZ125. Going up to a 57.3-inch wheelbase increases stability for the higher speeds found in off-road racing.

9. The YZ125X’s rake is kicked out nearly a degree from the YZ125, and there is 0.3 inches more trail. Again, these are changes to make the YZ125X more stable at high speed. Given how light the YZ125 is, agility should still be impressive in tight quarters.

10. The seat height on the YZ125X is 0.8 inches lower than the YZ125. This will come in handy when the need arises to paddle through technical terrain.

2020 Yamaha YZ 125 X Review11. A kickstand is standard on the YZ125X.  

12. To let you know it’s time to get back to the truck, the 2020 Yamaha YZ125X’s petcock has a reserve position. Of course, we’ll prefer EFI, but Yamaha built the X to a price point. To be fair, the 38mm Mikuni TMX carburetor gives us little to complain about.

13. Important carry-over parts from the YZ125 include the aluminum frame, six-speed transmission, and 270mm front disc brake.

14. The wet weight of the 2010 Yamaha YZ125X is 209 pounds—up two pounds from the motocrosser. For comparison in Yamaha’s GNCC racer line, the YZ125X is 36 pounds lighter than the four-stroke YZ250FX and 20 pounds lighter than the two-stroke YZ250X.

YZ 125 X off road racer15. Like the YZ250X, the YZ125X is kickstart-only. That simplifies things, as there is no need for a battery and the electrical system needed to support it. On the downside, you have to kick it to start it.

16. Oddly, ground clearance on the YZ125X is over a half-inch less than the YZ125. We prefer more ground clearance for rocky terrain, not less. Still, 13.8 inches of ground clearance isn’t bad.

17. The 2020 Yamaha YZ125X will hit the showroom floors this month with an MSRP of $6699. That is $100 more than the YZ125 MXer.

2020 Yamaha YZ125X Specs


  • Type: Two-stroke single
  • Displacement: 125cc
  • Bore x stroke: 54.0 x 54.5mm
  • Compression ratio: 7.4:1 to 8.8:1
  • Fueling: 38mm Mikuni TMX carburetor
  • Intake: Reed valve
  • Port timing: Power valve
  • Lubrication: Premix
  • Chain: O-ring


  • Frame: Aluminum
  • Front suspension; travel: Fully adjustable KYB Speed-Sensitive System inverted fork; 11.8 inches
  • Rear suspension; travel: Linkage-assisted, fully adjustable KYB shock; 12.4 inches
  • Tires: Dunlop Geomax AT81
  • Front tire: 90/90 x 21
  • Rear tire: 110/90 x 18
  • Front brake: 270mm disc
  • Rear brake: 245mm disc


  • Wheelbase: 57.3 inches
  • Rake: 26.8 degrees
  • Trail: 4.3 inches
  • Seat height: 38.4 inches
  • Ground clearance: 14.4 inches
  • Fuel capacity: 2.1 gallons
  • Wet weight: 207 pounds
  • Color: Team Yamaha Blue

2020 Yamaha YZ125X Price:

  • $6499 MSRP

2020 Yamaha YZ125X Review | Photo Gallery







Don Williams
Don Williamshttp://www.ultimatemotorcycling.com
With 45 years of riding experience, Don Williams is a fan of all kinds of motorcycles. He enjoys sport bikes, cruisers, dirt bikes, touring bikes, adventure bikes, dual sport bikes, and rideable customs. Ask Don what his favorite bike is and he will tell you, "Whatever bike I'm on."

2019 Monster Energy Cup Supercross Results: Las Vegas

2019 Monster Energy Cup Supercross Results: Cianciarulo Wins In 450 Debut With three riders—Adam Cianciarulo, Malcolm Stewart, and Eli Tomac—tied for the lead going into the...

Kawasaki Ninja400R.com SuperBike Club Racer: Spec Bike Test

Race-Ready 300-pound Ninja 400 From Norton Motorsports Back in late 2017, I found myself twisting the throttle of the then all-new Kawasaki Ninja 400 around...

2019 Monster Energy Cup Guide: Supercross In Las Vegas

2019 Monster Energy Cup Guide: How To Watch, Plus Rider Quotes and News Supercross returns to Las Vegas for the 2019 Monster Energy Cup, giving fans...

2020 Harley-Davidson Street Glide Buyer’s Guide: Specs & Price

Capable of urban duty, as well as cross-county trips, the 2020 Harley-Davidson Street Glide is a practical motorcycle that is also a genuine head-turner.

Yamaha’s Quartararo Untouchable Friday at Motegi MotoGP Practice

Petronas Yamaha's Fabio Quartararo, was untouchable Friday during the opening practice of the 2019 Grand Prix of Japan at Motegi.

2019 Fall Slimey Crud Run: Rain Fled, Classics Came Out

Despite long odds against blue skies, Sunday turned out cool and dry. One thousand riders took showed up in force at the 2019 Fall Slimey Crud Run.