The 2020 Yamaha YZ125 is a legendary motocross bike with a rich history dating back decades. As a pure off-road motorcycle, it boasts a lightweight, aggressive, two-stroke design. While specific trims for the YZ125 are generally consistent year-to-year, it remains a staple in Yamaha's lineup, offering an accessible entry point into competitive motocross. Its enduring popularity stems from its thrilling performance, ease of maintenance, and the raw, engaging riding experience it provides, making it a favorite for both aspiring racers and seasoned enthusiasts seeking classic two-stroke fun.
The Good
The 2020 YZ125 shines with its exhilarating two-stroke performance, nimble handling, and proven reliability. Its simple, robust design appeals to practical buyers for ease of maintenance, while the visceral thrill and iconic sound ignite the passion of any rider.
The Bad
While a fantastic machine, the 2020 YZ125's two-stroke engine requires more frequent top-end rebuilds than a four-stroke. Its powerband can be narrow, demanding rider skill, and it lacks modern electronic rider aids found on some competitors.
2020 Yamaha YZ125: Quick Overview
- Engine: 125cc liquid-cooled 2-stroke; reed valve inducted
- Bore x Stroke: 54.0 mm x 54.5 mm
- Compression Ratio: 8.2:1
- Fuel Induction: Keihin® 38mm carburetor
- Ignition: CDI
- Transmission: 6-speed constant mesh
- Clutch: Wet, multiple-disc
- Final Drive: O-ring chain
- Suspension Front: KYB® Speed Sensitive System inverted telescopic fork; fully adjustable, 11.8 in. travel
- Suspension Rear: KYB® fully adjustable single shock w/ spring preload, 12.4 in. travel
- Brakes Front: Hydraulic disc, 270mm
- Brakes Rear: Hydraulic disc, 245mm
- Tires Front: 80/100-21 51M
- Tires Rear: 110/90-19 62M
- Length: 85.3 in.
- Width: 32.3 in.
- Height: 50.2 in.
- Seat Height: 38.4 in.
- Wheelbase: 58.1 in.
- Ground Clearance: 13.0 in.
- Fuel Capacity: 2.1 gal.
- Oil Capacity: 0.70 qt.
- Weight (Wet): 209 lb.
- Horsepower: Estimated around 35-40 hp (varies by tuning and conditions)
- Fuel Economy: Not officially rated, as it's an off-road competition vehicle. Typically around 15-25 mpg depending on riding style.
- 0-60 Times: Not applicable for this type of vehicle.
- Towing Capacity: Not applicable.
- Trim-Level Features: The 2020 YZ125 is a single-model offering focused on pure motocross performance. Key features include a lightweight aluminum frame, high-performance KYB suspension, powerful 2-stroke engine, durable drivetrain, and aggressive styling.
2020 Yamaha YZ125 Specifications
Vehicle Information
| Year | 2020 |
| Make | Yamaha |
| Model | YZ125 |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Motorcycle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | IWATA |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 124CC |
| Engine Size | 124L |
| Engine Cylinders | 1 |
| Transmission | 6 Motorcycle - Chain Drive |
| Transmission Type | Manual |
| Transmission Speeds | 6-Speed |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 2020 Yamaha YZ125 Have?
The 2020 Yamaha YZ125, like most 125cc two-stroke motocross bikes, is generally regarded as highly reliable when properly maintained. The engine architecture is simple and proven, leading to fewer complex failures compared to more intricate four-stroke designs. However, the primary area that requires consistent attention for two-strokes is the top end. Owners frequently report needing to replace piston rings and piston kits at regular intervals, typically every 20-40 hours of hard riding, depending on how aggressively the bike is used and the quality of maintenance. Neglecting this can lead to accelerated wear on the cylinder and potentially more costly repairs.
Clutch wear is another common item, especially for riders who frequently slip the clutch in technical terrain or during aggressive starts. The clutch plates can wear down over time and will need replacement. Chain and sprocket wear are also standard maintenance items for any dirt bike and are not unique to the YZ125. Some riders might experience occasional carburetor tuning issues if the bike is not ridden consistently or if it is exposed to varying altitudes and temperatures without proper jetting adjustments.
Regarding recalls, Yamaha is diligent about addressing any safety concerns. For the 2020 YZ125, there were no widespread, significant recalls reported that indicate a systemic flaw. The model year is part of a long lineage of YZ125s that have a strong reputation for durability. Long-term reliability concerns are almost entirely tied to the rider's commitment to maintenance. Those who change their oil regularly, clean their air filter after every ride, adhere to the recommended top-end rebuild schedule, and keep the drivetrain properly lubricated can expect their 2020 YZ125 to last for many years and countless hours of enjoyment.
Clutch wear is another common item, especially for riders who frequently slip the clutch in technical terrain or during aggressive starts. The clutch plates can wear down over time and will need replacement. Chain and sprocket wear are also standard maintenance items for any dirt bike and are not unique to the YZ125. Some riders might experience occasional carburetor tuning issues if the bike is not ridden consistently or if it is exposed to varying altitudes and temperatures without proper jetting adjustments.
Regarding recalls, Yamaha is diligent about addressing any safety concerns. For the 2020 YZ125, there were no widespread, significant recalls reported that indicate a systemic flaw. The model year is part of a long lineage of YZ125s that have a strong reputation for durability. Long-term reliability concerns are almost entirely tied to the rider's commitment to maintenance. Those who change their oil regularly, clean their air filter after every ride, adhere to the recommended top-end rebuild schedule, and keep the drivetrain properly lubricated can expect their 2020 YZ125 to last for many years and countless hours of enjoyment.
How long will the 2020 Yamaha YZ125 last?
Estimating mileage for a 2020 Yamaha YZ125 is challenging as it's typically measured in engine hours rather than miles. However, with diligent maintenance, including regular top-end rebuilds every 20-40 hours and bottom-end rebuilds every 80-100 hours, the engine cases and crank are known to last for hundreds of hours. Owners who meticulously follow service intervals can expect their YZ125 to remain competitive and reliable for 5-10 years or more, with the primary wear items being the piston, rings, and clutch plates. The bike's lightweight aluminum frame and suspension components are inherently durable and can last the lifetime of the bike with proper care. The main weakness over time is the inherent need for more frequent engine internal maintenance compared to a four-stroke.
What Technology & Safety Features are Included?
The 2020 Yamaha YZ125 is a purpose-built motocross machine, and as such, it eschews most of the modern technological conveniences found in street-legal vehicles or even some other off-road motorcycles. There is no built-in tech like infotainment systems, navigation, or Bluetooth connectivity. The focus is purely on performance and rider control. The bike features a simple LCD display that primarily shows the hour meter, indicating when maintenance is due. There are no advanced entertainment features because the exhilarating sound of the two-stroke engine is its own soundtrack.
Driver-assistance features are entirely absent, as a motocross bike relies on the rider's skill and input for all operations. There are no ABS, traction control, or riding modes. Safety features are centered around robust mechanical components. This includes powerful hydraulic disc brakes at both the front and rear for decisive stopping power, a strong, lightweight aluminum frame for stability and control, and high-performance KYB suspension that absorbs impacts and provides excellent feedback, allowing the rider to maintain control over rough terrain. The aggressive knobby tires offer maximum grip on dirt surfaces.
Optional features are limited to aftermarket performance enhancements and protective accessories such as handguards, skid plates, and different exhaust systems, rather than electronic upgrades. Crash-test ratings are not applicable to motocross motorcycles, as they are designed for off-road competition where such testing is not standard. The inherent safety of the YZ125 relies on its well-engineered chassis, responsive controls, and the rider's ability to manage the machine effectively in challenging off-road conditions. Its simplicity, in this context, contributes to its reliability and predictable behavior.
Driver-assistance features are entirely absent, as a motocross bike relies on the rider's skill and input for all operations. There are no ABS, traction control, or riding modes. Safety features are centered around robust mechanical components. This includes powerful hydraulic disc brakes at both the front and rear for decisive stopping power, a strong, lightweight aluminum frame for stability and control, and high-performance KYB suspension that absorbs impacts and provides excellent feedback, allowing the rider to maintain control over rough terrain. The aggressive knobby tires offer maximum grip on dirt surfaces.
Optional features are limited to aftermarket performance enhancements and protective accessories such as handguards, skid plates, and different exhaust systems, rather than electronic upgrades. Crash-test ratings are not applicable to motocross motorcycles, as they are designed for off-road competition where such testing is not standard. The inherent safety of the YZ125 relies on its well-engineered chassis, responsive controls, and the rider's ability to manage the machine effectively in challenging off-road conditions. Its simplicity, in this context, contributes to its reliability and predictable behavior.
What Colors Options are Available?
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2020 Yamaha YZ125 Prices and Market Value
Ownership costs for a 2020 Yamaha YZ125 are generally moderate, leaning towards economical compared to larger, more complex machines. Insurance is typically inexpensive, often covered under a multi-sport policy. Fuel costs are manageable, though two-strokes tend to be thirstier than comparable four-strokes. Maintenance is the most significant factor; regular top-end rebuilds (piston, rings) every 20-40 hours are essential and add to annual expenses. Repairs can be reasonable due to the simplicity of the two-stroke engine, but neglected maintenance can escalate costs. Overall, it's a cost-effective choice for dedicated off-road enthusiasts willing to perform regular upkeep.
2020 Yamaha YZ125 Cost of Ownership
The 2020 Yamaha YZ125 operates in the highly competitive 125cc two-stroke motocross segment, facing off primarily against the KTM 125 SX, Husqvarna TC 125, and Kawasaki KX125 (though the KX125 was largely absent from the US market in recent years, with the YZ125 being a consistent presence).
Performance: The YZ125 is renowned for its broad, tractable powerband and user-friendly acceleration, making it excellent for learning and racing. The KTM and Husqvarna 125s often boast slightly more peak horsepower and a sharper engine character, appealing to more experienced racers seeking an edge. The YZ125's suspension, typically KYB components, is excellent and often considered among the best in class for comfort and performance, rivaling or even surpassing the WP suspension found on KTM and Husqvarna.
Features: In terms of features, the YZ125 is basic, which is its strength for many. It prioritizes a robust, simple design over electronic aids. The KTM and Husqvarna bikes, while also focused, may offer slightly more refined ergonomics or component choices in certain years. All are built with durable chassis and braking systems.
Reliability: Yamaha has a legendary reputation for reliability, and the YZ125 is no exception. Its simple two-stroke design is inherently less prone to complex failures than four-strokes. KTM and Husqvarna have improved significantly over the years, but Yamaha often holds a slight edge in perceived long-term durability and ease of maintenance for the average rider.
Price: The 2020 YZ125 was competitively priced when new, often slotting in below its Austrian counterparts. On the used market, its strong reputation and consistent demand mean it holds its value well.
Alternatives:
* Similar: The KTM 125 SX and Husqvarna TC 125 are the closest rivals. They offer slightly more potent engines and premium components, but often at a higher price point and with a potentially steeper learning curve for absolute beginners.
* Consider if: If absolute peak performance and a more aggressive powerband are paramount, and budget is less of a concern, the KTM or Husky might be preferred. For a balance of exhilarating performance, ease of use, reliability, and excellent value, the 2020 Yamaha YZ125 remains a top-tier choice and a benchmark in its class.
Performance: The YZ125 is renowned for its broad, tractable powerband and user-friendly acceleration, making it excellent for learning and racing. The KTM and Husqvarna 125s often boast slightly more peak horsepower and a sharper engine character, appealing to more experienced racers seeking an edge. The YZ125's suspension, typically KYB components, is excellent and often considered among the best in class for comfort and performance, rivaling or even surpassing the WP suspension found on KTM and Husqvarna.
Features: In terms of features, the YZ125 is basic, which is its strength for many. It prioritizes a robust, simple design over electronic aids. The KTM and Husqvarna bikes, while also focused, may offer slightly more refined ergonomics or component choices in certain years. All are built with durable chassis and braking systems.
Reliability: Yamaha has a legendary reputation for reliability, and the YZ125 is no exception. Its simple two-stroke design is inherently less prone to complex failures than four-strokes. KTM and Husqvarna have improved significantly over the years, but Yamaha often holds a slight edge in perceived long-term durability and ease of maintenance for the average rider.
Price: The 2020 YZ125 was competitively priced when new, often slotting in below its Austrian counterparts. On the used market, its strong reputation and consistent demand mean it holds its value well.
Alternatives:
* Similar: The KTM 125 SX and Husqvarna TC 125 are the closest rivals. They offer slightly more potent engines and premium components, but often at a higher price point and with a potentially steeper learning curve for absolute beginners.
* Consider if: If absolute peak performance and a more aggressive powerband are paramount, and budget is less of a concern, the KTM or Husky might be preferred. For a balance of exhilarating performance, ease of use, reliability, and excellent value, the 2020 Yamaha YZ125 remains a top-tier choice and a benchmark in its class.
2020 Yamaha YZ125 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2020 Yamaha YZ125 Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
2020 Yamaha YZ125 Insurance
Insurance for a 2020 Yamaha YZ125 is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2020 Yamaha YZ125 Compare to Other Motorcycle?
The 2020 Yamaha YZ125 is an ideal choice for aspiring motocross racers looking for an affordable, fun, and capable entry into the sport, as well as seasoned riders who appreciate the unique thrill and simplicity of a modern two-stroke. It's an excellent platform for learning clutch control, throttle finesse, and proper body positioning. Given its age, buying used is the only option, and it's definitely worth buying if you find one that has been well-maintained. Look for bikes with a documented maintenance history, especially regarding top-end rebuilds. It's a fantastic value proposition for anyone seeking pure, unadulterated off-road excitement without the complexity and cost of a four-stroke. Its legendary status and enduring appeal make it a sound investment for those who understand its maintenance requirements.
Final Verdict: Is the 2020 Yamaha YZ125 a Good Motorcycle?
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Simon A
Simon is a contributor to VinCheck, where he provides articles and reviews on various automotive topics. His work focuses on delivering accurate and up-to-date information about used cars, helping readers make informed decisions.