The 1986 Yamaha YZ125 is a motocross racing motorcycle, a staple in the YZ lineup known for its competitive spirit. As a dirt bike, its body style is aggressive and purpose-built for off-road performance. The YZ125 model has a long history, with the 1986 model representing a significant iteration. Pricing when new was in the typical range for high-performance dirt bikes of the era, and used prices now vary based on condition. It stands out for its potent two-stroke power and agile handling, making it a favorite among motocross enthusiasts seeking a thrilling ride.
The Good
The 1986 YZ125 boasts exhilarating two-stroke performance and a lightweight, agile chassis for superior handling. Its raw power appeals to thrill-seekers, while its robust build and manageable maintenance offer practical value for dedicated riders.
The Bad
Common weaknesses include wear on the clutch and transmission components due to aggressive use. Suspension seals can degrade, leading to leaks. Carburetor tuning can be finicky, and older plastics may be brittle or faded. Engine top-end rebuilds are a regular maintenance consideration.
1986 Yamaha YZ125: Quick Overview
- Engine: 124cc liquid-cooled 2-stroke single-cylinder
- Bore x Stroke: 56.0 mm x 50.7 mm
- Carburetion: Mikuni VM28SS
- Ignition: CDI
- Transmission: 6-speed constant mesh
- Clutch: Wet, multi-plate
- Suspension (Front): Kayaba 43mm telescopic fork, adjustable compression and rebound damping
- Suspension (Rear): Kayaba Monoshock, adjustable preload, compression, and rebound damping
- Front Brake: Drum brake
- Rear Brake: Drum brake
- Tires (Front): 80/100-21 46M
- Tires (Rear): 100/90-19 57M
- Frame: Steel, semi-double cradle
- Dimensions (LxWxH): Approximately 82.1 in x 32.5 in x 49.6 in (length, width, height may vary slightly)
- Wheelbase: Approximately 57.7 inches
- Ground Clearance: Approximately 13.4 inches
- Seat Height: Approximately 38.0 inches
- Fuel Capacity: Approximately 2.1 US gallons
- Dry Weight: Approximately 203 lbs
- Horsepower: Estimated around 28-32 hp (exact figures varied and were not officially published by Yamaha for racing models)
- Fuel Economy: Not applicable or relevant for a competition motocross bike; focus is on performance, not MPG.
- 0-60 Times: Not applicable or measured for this type of vehicle. Performance is measured in lap times or race track capability.
- Towing Capacity: Not applicable; this is a standalone off-road motorcycle.
- Trim-Level Features: The 1986 YZ125 was a single, high-performance trim designed for motocross racing. Key features included its liquid-cooled engine for sustained performance, robust adjustable suspension for varied terrain, and a lightweight chassis for agility.
1986 Yamaha YZ125 Specifications
Vehicle Information
| Year | 1986 |
| Make | Yamaha |
| Model | YZ125 |
| Trim | - |
| Style | - |
| Type | - |
| Category | - |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | - |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | - |
| Engine Size | - |
| Engine Cylinders | - |
| 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 1986 Yamaha YZ125 Have?
The 1986 Yamaha YZ125, like many high-performance two-stroke motocross bikes of its era, is known for requiring diligent maintenance to ensure longevity. Frequently reported issues often stem from the stresses of racing and aggressive off-road use. The clutch plates can wear relatively quickly, especially if subjected to excessive slipping or hard riding, leading to engagement issues or a spongy feel. The transmission, while generally robust, can suffer from worn dog teeth on gears if shifting is not executed smoothly or if the gearbox oil is not changed regularly. The liquid-cooling system, while beneficial for performance, can develop leaks from hoses or the radiator itself over time, especially if the coolant is not flushed and replaced periodically, or if debris causes damage to the radiator fins.
Another common area for concern is the suspension. The seals within the Kayaba front forks and rear monoshock can degrade with age and exposure to dirt and moisture, leading to oil leaks and a loss of damping performance. This necessitates seal replacement and fork oil changes. The carburetor, typically a Mikuni VM28SS, can become finicky and require regular cleaning and re-jetting depending on altitude, temperature, and modifications. For older models, wear on the crankshaft bearings and seals is also a possibility, which can lead to air leaks and performance degradation if not addressed.
While specific recalls for the 1986 YZ125 model are not widely documented in public databases, it's important to note that any recalls that may have existed would have been addressed decades ago. Long-term reliability heavily depends on how the bike was maintained and ridden. A well-maintained YZ125 can still be a reliable machine for recreational riding or vintage racing, but it will likely require more frequent attention and component replacement than a modern motocross bike. Parts availability for some wear items can be challenging, though many aftermarket and NOS (new old stock) parts are still obtainable through specialized suppliers. The engine's top-end (piston and rings) will require periodic rebuilds depending on usage, a standard maintenance item for two-stroke performance engines.
Another common area for concern is the suspension. The seals within the Kayaba front forks and rear monoshock can degrade with age and exposure to dirt and moisture, leading to oil leaks and a loss of damping performance. This necessitates seal replacement and fork oil changes. The carburetor, typically a Mikuni VM28SS, can become finicky and require regular cleaning and re-jetting depending on altitude, temperature, and modifications. For older models, wear on the crankshaft bearings and seals is also a possibility, which can lead to air leaks and performance degradation if not addressed.
While specific recalls for the 1986 YZ125 model are not widely documented in public databases, it's important to note that any recalls that may have existed would have been addressed decades ago. Long-term reliability heavily depends on how the bike was maintained and ridden. A well-maintained YZ125 can still be a reliable machine for recreational riding or vintage racing, but it will likely require more frequent attention and component replacement than a modern motocross bike. Parts availability for some wear items can be challenging, though many aftermarket and NOS (new old stock) parts are still obtainable through specialized suppliers. The engine's top-end (piston and rings) will require periodic rebuilds depending on usage, a standard maintenance item for two-stroke performance engines.
How long will the 1986 Yamaha YZ125 last?
Estimating average mileage for a 1986 Yamaha YZ125 is difficult as these are typically ridden in hours rather than miles, and often in demanding off-road conditions. However, for a recreational rider using it a few weekends a month, a well-maintained YZ125 might see service for 5-10 years before major component overhauls become frequent. For a racer, its competitive lifespan might be much shorter, with significant rebuilds needed annually. Long-term durability hinges entirely on maintenance. Weaknesses over time include wear on clutch packs, transmission gears, crank seals, and suspension components. The frame and chassis are generally robust, but cosmetic wear like faded plastics and corrosion on metal parts is common. Consistent oil changes, top-end rebuilds, and suspension service are crucial for extending its usable life beyond a few seasons of hard use.
What Technology & Safety Features are Included?
The 1986 Yamaha YZ125 is a purebred motocross machine, and as such, it is devoid of the technological conveniences and safety features found in modern vehicles or even street-legal motorcycles of its time. Its design philosophy is centered entirely on performance and rider feedback in an off-road competition environment.
Built-in Tech: The primary 'technology' present is its robust liquid-cooled two-stroke engine, designed for maximum power output and heat dissipation during intense racing. The ignition system is a CDI (Capacitor Discharge Ignition) unit, providing a strong spark. The transmission is a standard 6-speed sequential gearbox. Suspension is handled by adjustable Kayaba components, allowing riders to tune compression and rebound damping to suit track conditions and rider preference. This adjustability is the extent of its technological sophistication.
Entertainment: There is no entertainment system whatsoever. The 'entertainment' is derived purely from the visceral experience of riding and competing.
Driver-Assistance Features: None. This is a manually operated vehicle where the rider has complete control and responsibility.
Safety Features: Safety features are minimal and focus on the inherent design of a competition dirt bike. This includes adequate ground clearance to clear obstacles, durable controls, and a rider position optimized for balance and control. However, it lacks any modern safety aids such as ABS, traction control, or airbags, as these are not applicable or desirable in its intended use case. There are no crash-test ratings available as this type of vehicle is not subjected to standardized crash testing.
Optional Features: Optional features would have been limited to aftermarket performance parts like exhaust systems, different gearing, aftermarket handlebars, or enhanced protection components. These were typically chosen by riders to further tune the bike for specific racing disciplines or personal preferences. The concept of 'optional features' in the modern sense of infotainment or advanced safety systems simply did not exist for motocross bikes of this era.
Built-in Tech: The primary 'technology' present is its robust liquid-cooled two-stroke engine, designed for maximum power output and heat dissipation during intense racing. The ignition system is a CDI (Capacitor Discharge Ignition) unit, providing a strong spark. The transmission is a standard 6-speed sequential gearbox. Suspension is handled by adjustable Kayaba components, allowing riders to tune compression and rebound damping to suit track conditions and rider preference. This adjustability is the extent of its technological sophistication.
Entertainment: There is no entertainment system whatsoever. The 'entertainment' is derived purely from the visceral experience of riding and competing.
Driver-Assistance Features: None. This is a manually operated vehicle where the rider has complete control and responsibility.
Safety Features: Safety features are minimal and focus on the inherent design of a competition dirt bike. This includes adequate ground clearance to clear obstacles, durable controls, and a rider position optimized for balance and control. However, it lacks any modern safety aids such as ABS, traction control, or airbags, as these are not applicable or desirable in its intended use case. There are no crash-test ratings available as this type of vehicle is not subjected to standardized crash testing.
Optional Features: Optional features would have been limited to aftermarket performance parts like exhaust systems, different gearing, aftermarket handlebars, or enhanced protection components. These were typically chosen by riders to further tune the bike for specific racing disciplines or personal preferences. The concept of 'optional features' in the modern sense of infotainment or advanced safety systems simply did not exist for motocross bikes of this era.
What Colors Options are Available?
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1986 Yamaha YZ125 Prices and Market Value
When new in 1986, the Yamaha YZ125 would have retailed for approximately $1,800 to $2,000 USD, reflecting its status as a competitive motocross machine. Today, used market prices for a 1986 YZ125 vary significantly. A project bike in poor condition might be found for a few hundred dollars, while a well-maintained, restored, or race-ready example could fetch anywhere from $1,500 to $3,500 or more. Depreciation on these bikes is less about typical automotive trends and more about their condition and collectibility. Factors affecting resale value include originality of parts, maintenance history, condition of the engine and suspension, rarity of any special editions, and its appeal to vintage motocross enthusiasts. A fully restored or unmolested original example holds its value best.
1986 Yamaha YZ125 Cost of Ownership
Owning a 1986 Yamaha YZ125 can range from moderately economical to surprisingly costly, depending heavily on usage and maintenance. Insurance is typically low, often categorized as collector or off-road vehicle insurance. Fuel costs are moderate; it uses premium gasoline and 2-stroke oil mixed with the fuel. Maintenance and repair are where costs can escalate. Regular tune-ups, chain and sprockets, and tire replacements are standard. However, frequent top-end rebuilds, clutch replacements, and potential gearbox or suspension work can add up. For a rider who keeps it in top condition and performs their own maintenance, it can be reasonably affordable. For those relying on professional mechanics or facing significant wear and tear, it becomes a more costly endeavor.
1986 Yamaha YZ125 Fuel Efficiency
Fuel Type
-
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
1986 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
1986 Yamaha YZ125 Insurance
Insurance for a 1986 Yamaha YZ125 is moderately priced, reflecting its status as a Vehicle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1986 Yamaha YZ125 Compare to Other Vehicle?
The 1986 Yamaha YZ125 competed in the highly competitive 125cc motocross class against formidable rivals such as the Honda CR125R, Kawasaki KX125, and Suzuki RM125. In terms of performance, the YZ125 was known for its strong mid-range and top-end power delivery, often making it a favorite for riders who could keep the engine in its powerband. The Honda CR125R of this era was often praised for its overall package, blending power with good handling and reliability. The Kawasaki KX125 was typically seen as a strong contender with competitive power, while the Suzuki RM125 often offered nimble handling. Yamaha's liquid-cooled engine and adjustable suspension were competitive features, comparable to its peers.
Reliability varied across all brands in this period, but generally, the YZ125 was considered reasonably reliable if maintained diligently. Like its rivals, it required frequent attention to its two-stroke engine, clutch, and suspension. In terms of price when new, these bikes were in a similar ballpark, reflecting their high-performance, competition-focused nature. The YZ125 was often positioned competitively on price against its direct competitors.
When considering alternatives today, if one is looking for a similar vintage motocross experience, similar era Honda CR125Rs, Kawasaki KX125s, and Suzuki RM125s are direct comparisons. For riders seeking a more modern and potentially more reliable vintage motocross experience without the need for constant engine tuning, bikes from the late 1980s and early 1990s might offer a slightly more refined package, though the essence of their performance characteristics would still be similar. For those prioritizing outright vintage racing performance and a bike that was a proven contender, the 1986 YZ125 remains a solid choice, but its contemporaries from Honda, Kawasaki, and Suzuki are equally valid alternatives worth exploring depending on personal preference and availability.
Reliability varied across all brands in this period, but generally, the YZ125 was considered reasonably reliable if maintained diligently. Like its rivals, it required frequent attention to its two-stroke engine, clutch, and suspension. In terms of price when new, these bikes were in a similar ballpark, reflecting their high-performance, competition-focused nature. The YZ125 was often positioned competitively on price against its direct competitors.
When considering alternatives today, if one is looking for a similar vintage motocross experience, similar era Honda CR125Rs, Kawasaki KX125s, and Suzuki RM125s are direct comparisons. For riders seeking a more modern and potentially more reliable vintage motocross experience without the need for constant engine tuning, bikes from the late 1980s and early 1990s might offer a slightly more refined package, though the essence of their performance characteristics would still be similar. For those prioritizing outright vintage racing performance and a bike that was a proven contender, the 1986 YZ125 remains a solid choice, but its contemporaries from Honda, Kawasaki, and Suzuki are equally valid alternatives worth exploring depending on personal preference and availability.
Final Verdict: Is the 1986 Yamaha YZ125 a Good Vehicle?
The 1986 Yamaha YZ125 is ideally suited for vintage motocross enthusiasts, hobbyists looking for a project bike, or riders who appreciate the raw, exhilarating performance of classic two-stroke motocross machines. It's definitely worth buying for someone who understands the maintenance requirements of a performance-oriented dirt bike of this era. Buying a used YZ125 is the only option, and the condition is paramount. A meticulously maintained or restored example is best for those who want to ride it competitively or for recreation with minimal immediate issues. For a project, expect to invest time and money in repairs and parts. It offers a pure, unadulterated motocross experience that many modern bikes can't replicate, making it a rewarding purchase for the right owner.
Drew B
Drew is a seasoned automotive expert and contributor to VinCheck.info. With nearly 15 years of experience as a former Porsche technician, he brings a wealth of hands-on knowledge to his writing. Born in North Carolina, a region renowned for its deep-rooted NASCAR culture, Drew developed a passion for cars early in life, often building and working on vehicles from a young age. At VINCheck, Drew leverages his extensive technical background to provide in-depth analyses of various vehicles. His articles often focus on engine performance, reliability, and maintenance insights, offering readers practical information grounded in real-world experience. Some of his notable contributions include reviews on the Mazda CX-5's longevity and detailed examinations of engine options for models like the 2011 Toyota Camry and Tacoma