The 2011 Yamaha YZ125 is a staple in the motocross and off-road world, representing a long-standing lineage of competitive 125cc two-stroke dirt bikes. Its body style is pure sport performance, designed for agility and speed. While specific trims aren't common, the YZ125 is the singular focus. It consistently commands popularity due to its thrilling, rev-happy engine, lightweight chassis, and accessible performance for a wide range of riders, from aspiring racers to seasoned enthusiasts seeking an exhilarating ride. Its pricing typically falls in the mid-range for new dirt bikes in its class.
The Good
The 2011 YZ125 excels with its exhilarating two-stroke powerband, sharp handling, and lightweight agility, offering pure riding joy. Its robust Yamaha build ensures reliability, while its competitive pricing provides excellent value for performance-minded riders seeking an affordable entry into motocross.
The Bad
The 2011 YZ125, like most 125cc two-strokes, requires diligent maintenance, especially engine top-end components. Its relatively modest power output compared to larger bikes can be a limitation on open tracks, and suspension tuning might be necessary for heavier riders.
2011 Yamaha YZ125: Quick Overview
- Engine: 124cc liquid-cooled 2-stroke, reed-valve induction
- Bore x Stroke: 54mm x 54.5mm
- Compression Ratio: 8.2:1
- Carburetion: Keihin PWK38S
- Ignition: Digital CDI
- Transmission: 6-speed constant mesh
- Final Drive: Chain
- Front Suspension: 46mm inverted telescopic fork with adjustable compression and rebound damping; 11.8 inches of travel
- Rear Suspension: Single shock with adjustable preload, compression, and rebound damping; 12.4 inches of travel
- Front Brakes: Hydraulic disc
- Rear Brakes: Hydraulic disc
- Front Tire: 80/100-21 51M
- Rear Tire: 100/90-19 57M
- Wheelbase: 57.9 inches
- Ground Clearance: 14.4 inches
- Seat Height: 38.1 inches
- Fuel Capacity: 2.1 gallons
- Dry Weight: 198 lbs
- Horsepower: Estimated around 35-38 hp (actual figures vary and are not officially published by Yamaha for this model year, but are typical for competitive 125cc two-strokes).
- Fuel Economy: Not officially rated, but typically less than 30 mpg due to performance-oriented tuning.
- 0-60 mph: Not applicable/tested for this type of off-road vehicle.
- Towing Capacity: Not applicable.
- Trim-Level Features: The 2011 YZ125 is offered in a single, highly focused motocross trim. Key features include its potent liquid-cooled 2-stroke engine, advanced KYB SSS (Speed Sensitive System) front forks and a KYB rear shock for premium suspension performance, a lightweight aluminum frame, aggressive styling, and durable components designed for competitive off-road use. There are no other distinct trim levels for this model year.
2011 Yamaha YZ125 Specifications
Vehicle Information
| Year | 2011 |
| Make | Yamaha |
| Model | YZ125 |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Motorcycle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | HAMAMATSU |
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 | - |
| Transmission Type | - |
| Transmission Speeds | - |
| 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 2011 Yamaha YZ125 Have?
The 2011 Yamaha YZ125 is generally considered a very reliable motorcycle, benefiting from Yamaha's strong reputation for building durable two-stroke engines. However, like any high-performance motocross bike, it demands regular and meticulous maintenance to ensure longevity and prevent issues. The most frequently reported concerns, while not necessarily indicating a design flaw, revolve around the inherent demands of a 125cc two-stroke engine. These include:
Top-End Rebuilds: The piston rings, piston, and possibly the cylinder bore will wear over time and require periodic replacement. For aggressive riders or those who frequently ride at high RPMs, this interval can be shorter. Owners often track engine hours rather than mileage. Failure to perform timely top-end rebuilds can lead to catastrophic engine failure, scoring the cylinder and potentially damaging the crankshaft.
Clutch Wear: Due to the high-revving nature and frequent clutch use in motocross, clutch plates and springs can wear out. Regular fluid changes and proper clutch operation are key to extending their life.
Exhaust Power Valve Issues: While generally reliable, the power valve system, which optimizes engine performance across the RPM range, can occasionally get sticky or require cleaning. If not maintained, it can lead to reduced performance or uneven power delivery.
Carburetor Tuning: Two-stroke engines are sensitive to altitude, temperature, and humidity changes. Owners may need to adjust carburetor jetting for optimal performance and to prevent overheating or lean conditions, which can cause engine damage.
Radiator Leaks/Damage: In off-road conditions, radiators are susceptible to impacts from rocks or debris. While not a common failure, bent fins or actual leaks can lead to overheating. Owners often opt for aftermarket guards.
Recalls: As of my last update, there are no widespread or significant recalls specifically documented for the 2011 Yamaha YZ125 model. Yamaha typically addresses any safety-related issues promptly through official recall campaigns if identified.
Long-Term Reliability: With proper care, including regular oil changes, air filter cleaning, chain lubrication, and timely engine rebuilds, the 2011 YZ125 can be a very long-lasting machine. The engine cases, transmission, and chassis components are built to withstand the rigors of racing. The key is proactive maintenance, not reactive repairs. Neglecting maintenance is the primary driver of significant problems.
Top-End Rebuilds: The piston rings, piston, and possibly the cylinder bore will wear over time and require periodic replacement. For aggressive riders or those who frequently ride at high RPMs, this interval can be shorter. Owners often track engine hours rather than mileage. Failure to perform timely top-end rebuilds can lead to catastrophic engine failure, scoring the cylinder and potentially damaging the crankshaft.
Clutch Wear: Due to the high-revving nature and frequent clutch use in motocross, clutch plates and springs can wear out. Regular fluid changes and proper clutch operation are key to extending their life.
Exhaust Power Valve Issues: While generally reliable, the power valve system, which optimizes engine performance across the RPM range, can occasionally get sticky or require cleaning. If not maintained, it can lead to reduced performance or uneven power delivery.
Carburetor Tuning: Two-stroke engines are sensitive to altitude, temperature, and humidity changes. Owners may need to adjust carburetor jetting for optimal performance and to prevent overheating or lean conditions, which can cause engine damage.
Radiator Leaks/Damage: In off-road conditions, radiators are susceptible to impacts from rocks or debris. While not a common failure, bent fins or actual leaks can lead to overheating. Owners often opt for aftermarket guards.
Recalls: As of my last update, there are no widespread or significant recalls specifically documented for the 2011 Yamaha YZ125 model. Yamaha typically addresses any safety-related issues promptly through official recall campaigns if identified.
Long-Term Reliability: With proper care, including regular oil changes, air filter cleaning, chain lubrication, and timely engine rebuilds, the 2011 YZ125 can be a very long-lasting machine. The engine cases, transmission, and chassis components are built to withstand the rigors of racing. The key is proactive maintenance, not reactive repairs. Neglecting maintenance is the primary driver of significant problems.
How long will the 2011 Yamaha YZ125 last?
Estimating average mileage for a 2011 Yamaha YZ125 is challenging as it's primarily used for recreational riding and racing, where hours of use are a more relevant metric than miles. A well-maintained YZ125 can easily last for many years, often exceeding 10 years of ownership. However, its long-term durability hinges critically on maintenance. Enthusiasts might put 50-100 hours of hard riding on a bike per year. With diligent maintenance, including regular top-end rebuilds every 30-50 hours of aggressive use, oil changes, and component replacements, the engine cases, transmission, and chassis can endure for hundreds of hours. The primary weakness over time is engine wear, specifically the piston, rings, and cylinder, which are wear items in any high-performance two-stroke. Other components like suspension seals, bearings, and the clutch will also require routine replacement. Ultimately, a YZ125's lifespan is dictated by the owner's commitment to maintenance rather than a fixed mileage or age limit.
What Technology & Safety Features are Included?
The 2011 Yamaha YZ125 is a purebred motocross and off-road competition machine, and as such, its design philosophy prioritizes performance, agility, and rider connection over modern technological amenities. Consequently, it lacks virtually all the advanced tech, entertainment, driver-assistance, and traditional safety features found in street-legal vehicles or even modern utility ATVs.
Built-in Tech: The technology present is purely mechanical and performance-oriented. This includes a liquid-cooled engine with a reed-valve induction system for optimal power delivery, a 6-speed transmission for precise gear selection, and advanced suspension systems (KYB SSS forks and KYB rear shock) designed for high-speed impact absorption and adjustability. A digital CDI ignition system ensures consistent spark. There are no electronic rider aids, digital displays beyond basic indicators (if any are even present, often just a kill switch and possibly an hour meter as an aftermarket addition), or connectivity features.
Entertainment: Entertainment in the context of a YZ125 is the raw thrill of riding, the sound of the two-stroke engine, and the challenge of the terrain. There is no audio system, no infotainment screen, and no provisions for such.
Driver-Assistance Features: None. The rider is solely responsible for control and awareness. Features like ABS, traction control, stability control, cruise control, or even basic lighting (headlights/taillights are typically absent on competition models) are not present.
Safety Features: Safety in this context relies on the rider's skill and the bike's mechanical integrity. The hydraulic disc brakes provide effective stopping power, which is a critical safety feature. The sturdy aluminum frame and durable components contribute to the bike's overall robustness. However, there are no passive safety systems like airbags or crumple zones. As an off-road competition vehicle, it is not subjected to standard road vehicle crash-test ratings (e.g., NHTSA or IIHS ratings) as it is not designed or intended for use on public roads. Rider protection is entirely dependent on the rider's protective gear (helmet, boots, pads, etc.).
Optional Features: While not built-in, many owners equip their YZ125s with optional performance enhancements or protective accessories. These can include aftermarket exhaust systems for increased power, different gearing, upgraded clutch components, handguards for protection from roost and branches, skid plates for undercarriage protection, and sometimes an hour meter to track maintenance intervals.
Built-in Tech: The technology present is purely mechanical and performance-oriented. This includes a liquid-cooled engine with a reed-valve induction system for optimal power delivery, a 6-speed transmission for precise gear selection, and advanced suspension systems (KYB SSS forks and KYB rear shock) designed for high-speed impact absorption and adjustability. A digital CDI ignition system ensures consistent spark. There are no electronic rider aids, digital displays beyond basic indicators (if any are even present, often just a kill switch and possibly an hour meter as an aftermarket addition), or connectivity features.
Entertainment: Entertainment in the context of a YZ125 is the raw thrill of riding, the sound of the two-stroke engine, and the challenge of the terrain. There is no audio system, no infotainment screen, and no provisions for such.
Driver-Assistance Features: None. The rider is solely responsible for control and awareness. Features like ABS, traction control, stability control, cruise control, or even basic lighting (headlights/taillights are typically absent on competition models) are not present.
Safety Features: Safety in this context relies on the rider's skill and the bike's mechanical integrity. The hydraulic disc brakes provide effective stopping power, which is a critical safety feature. The sturdy aluminum frame and durable components contribute to the bike's overall robustness. However, there are no passive safety systems like airbags or crumple zones. As an off-road competition vehicle, it is not subjected to standard road vehicle crash-test ratings (e.g., NHTSA or IIHS ratings) as it is not designed or intended for use on public roads. Rider protection is entirely dependent on the rider's protective gear (helmet, boots, pads, etc.).
Optional Features: While not built-in, many owners equip their YZ125s with optional performance enhancements or protective accessories. These can include aftermarket exhaust systems for increased power, different gearing, upgraded clutch components, handguards for protection from roost and branches, skid plates for undercarriage protection, and sometimes an hour meter to track maintenance intervals.
What Colors Options are Available?
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2011 Yamaha YZ125 Prices and Market Value
When new, the 2011 Yamaha YZ125 had an MSRP typically ranging from around $6,000 to $6,500 USD. The used market for the 2011 YZ125 varies significantly based on condition, hours of use, modifications, and overall maintenance history. Expect to find them generally priced between $2,500 and $4,500 USD. Newer or exceptionally well-maintained examples with low hours can fetch prices at the higher end of this spectrum. Depreciation for dirt bikes is generally steeper in the first few years compared to street bikes, but the YZ125, being a long-standing and sought-after model, holds its value relatively well, especially compared to less popular or less capable models. Factors heavily affecting resale value include the condition of the engine (top-end recently rebuilt is a big plus), suspension, plastics, and any performance modifications. Bikes that have been raced extensively and show significant wear will naturally command lower prices. A clean, stock, and well-documented example will always sell for more.
2011 Yamaha YZ125 Cost of Ownership
Ownership costs for a 2011 Yamaha YZ125 are moderate to high, depending on usage. Insurance is typically inexpensive if you can even get it for a dedicated competition bike, as it's often used off-road. Fuel costs are reasonable, though 2-stroke pre-mix is required. Maintenance and repair are where costs can add up; frequent top-end rebuilds (every 30-50 hours), oil changes, and potential part failures require consistent investment. While not excessively expensive to own in terms of consumables and routine upkeep if done by the owner, the cost of competitive riding, including replacement parts and potential track fees, can make it a moderately costly hobby. It is not an economical choice for basic transportation but offers high value for its performance if maintained.
2011 Yamaha YZ125 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2011 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
2011 Yamaha YZ125 Insurance
Insurance for a 2011 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 2011 Yamaha YZ125 Compare to Other Motorcycle?
The 2011 Yamaha YZ125 primarily competes in the 125cc motocross segment against bikes like the KTM 125 SX and the Suzuki RM125 (though the RM125 was nearing the end of its production cycle by 2011).
Performance: The YZ125 is renowned for its potent and exciting two-stroke engine that loves to rev, delivering thrilling acceleration. In terms of outright power, it was competitive within its class for 2011. The KTM 125 SX is often lauded for its strong mid-range and top-end power. The YZ125's performance is characterized by its agility and sharp handling, making it excellent for technical tracks and tight corners.
Features: Yamaha equipped the 2011 YZ125 with excellent suspension components, notably the KYB SSS (Speed Sensitive System) front forks and a KYB rear shock, which were top-tier for the era and offered superior adjustability and performance compared to many competitors. The aluminum frame contributed to its light and nimble feel. KTM often featured strong engines and sometimes slightly more advanced chassis designs, but the YZ125's suspension package was a significant selling point.
Reliability: Yamaha has a stellar reputation for engine durability in their two-stroke YZ line. While all 125cc two-strokes require diligent maintenance, the YZ125 is generally considered very reliable and robust. KTMs, while powerful, sometimes have a reputation for requiring more frequent specialized attention compared to Yamaha. Suzuki's RM125 was also a reliable machine, but its development had slowed.
Price: When new, the YZ125 was competitively priced, often landing in the mid-range of its class. Used, the YZ125 tends to hold its value well due to its popularity and Yamaha's reputation. KTMs might command a similar or slightly higher price on the used market depending on condition.
Alternatives:
Overall, the 2011 YZ125 remains a fantastic choice for its blend of performance, handling, and reliability in the 125cc class.
Performance: The YZ125 is renowned for its potent and exciting two-stroke engine that loves to rev, delivering thrilling acceleration. In terms of outright power, it was competitive within its class for 2011. The KTM 125 SX is often lauded for its strong mid-range and top-end power. The YZ125's performance is characterized by its agility and sharp handling, making it excellent for technical tracks and tight corners.
Features: Yamaha equipped the 2011 YZ125 with excellent suspension components, notably the KYB SSS (Speed Sensitive System) front forks and a KYB rear shock, which were top-tier for the era and offered superior adjustability and performance compared to many competitors. The aluminum frame contributed to its light and nimble feel. KTM often featured strong engines and sometimes slightly more advanced chassis designs, but the YZ125's suspension package was a significant selling point.
Reliability: Yamaha has a stellar reputation for engine durability in their two-stroke YZ line. While all 125cc two-strokes require diligent maintenance, the YZ125 is generally considered very reliable and robust. KTMs, while powerful, sometimes have a reputation for requiring more frequent specialized attention compared to Yamaha. Suzuki's RM125 was also a reliable machine, but its development had slowed.
Price: When new, the YZ125 was competitively priced, often landing in the mid-range of its class. Used, the YZ125 tends to hold its value well due to its popularity and Yamaha's reputation. KTMs might command a similar or slightly higher price on the used market depending on condition.
Alternatives:
- Similar: The KTM 125 SX (2011 model year) is a very strong contender, often offering slightly more peak power and a different feel in the engine and chassis. The Suzuki RM125 (if available from 2011 or slightly earlier) is also a similar alternative, known for its smooth power delivery and good handling, though it was aging by this point.
- Better (depending on rider preference): For riders prioritizing raw power and a more modern feel, a later model YZ125 (e.g., 2015+) would offer significant improvements. For those considering a step up in displacement, a 250cc two-stroke like the Yamaha YZ250 or KTM 250 SX offers considerably more torque and power, though at the cost of increased weight and potentially a steeper learning curve. For absolute beginners or those seeking ease of use, a four-stroke in the 250cc class might be considered, though they offer a different riding experience.
Overall, the 2011 YZ125 remains a fantastic choice for its blend of performance, handling, and reliability in the 125cc class.
Final Verdict: Is the 2011 Yamaha YZ125 a Good Motorcycle?
The 2011 Yamaha YZ125 is ideal for intermediate to advanced riders looking for an exhilarating and engaging motocross or off-road experience. It's perfect for those who appreciate the raw power and sharp handling of a lightweight two-stroke and want to hone their riding skills, especially cornering and clutch control. It's absolutely worth buying if you prioritize fun and agility over brute power. Purchasing it used is the most common and sensible option, as new models are rare and costly. Look for bikes with well-documented maintenance and ideally, recently rebuilt engines. Avoid heavily raced or neglected examples. If you're on a budget and seeking a competitive and incredibly fun dirt bike that teaches valuable riding techniques, the 2011 YZ125 is a solid investment, provided you are prepared for its specific maintenance requirements.
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.