The 1998 Yamaha YZ400 was a groundbreaking machine in the motocross world. As a full-size two-stroke motocross bike, it represented a significant leap in displacement for Yamaha's YZ line. It was produced for a limited time, essentially being the predecessor to the YZ426F and later the YZ450F. Its popularity stemmed from its potent engine and competitive performance, making it a sought-after dirt bike for enthusiasts and racers alike during its era.
The Good
The 1998 Yamaha YZ400 offered exhilarating performance with its powerful two-stroke engine. Its rugged design and Yamaha's reputation for reliability provided a sense of confidence. For practical buyers, it was a relatively straightforward machine to maintain, and for emotional buyers, the raw power and thrilling ride were undeniable draws.
The Bad
While powerful, the 1998 YZ400 could be a handful to manage, especially for less experienced riders due to its aggressive power delivery. Some owners reported that the suspension, while capable, might require tuning for optimal performance across various terrains. Clutch wear could also be a consideration on heavily used models.
1998 Yamaha YZ400: Quick Overview
- Engine: Liquid-cooled, 2-stroke, single-cylinder
- Displacement: 396cc
- Bore x Stroke: 87mm x 66mm
- Compression Ratio: 7.2:1
- Carburetion: Keihin PWK39, single
- Ignition: Digital CDI
- Transmission: 5-speed constant mesh
- Clutch: Wet, multiple disc
- Horsepower: Estimated around 50-55 HP (at the crank, specific figures can vary and were not always officially published for off-road bikes of this era).
- Torque: Significant torque output, characteristic of a large-displacement two-stroke.
- Fuel Economy: Not applicable in the traditional sense for a competition motocross bike. Fuel consumption is high and dependent on riding style and terrain.
- 0-60 Times: Not a relevant metric for this type of vehicle, as it is designed for off-road performance and not measured in road-going acceleration.
- Towing Capacity: Not applicable. This is a single-rider off-road motorcycle.
- Top Speed: Dependent on gearing and rider, but typically in the range of 70-80+ MPH in optimal conditions.
- Frame: Steel semi-double cradle
- Front Suspension: 46mm Kayaba upside-down telescopic fork with adjustable compression and rebound damping.
- Rear Suspension: Kayaba monoshock with adjustable preload, compression, and rebound damping.
- Front Brake: Hydraulic disc
- Rear Brake: Hydraulic disc
- Front Tire: 80/100-21
- Rear Tire: 110/90-19
- Dimensions (L x W x H): Varied, but typical for a motocross bike.
- Wheelbase: Approximately 57.7 inches (1465mm)
- Ground Clearance: Approximately 14.2 inches (360mm)
- Seat Height: Approximately 38.6 inches (980mm)
- Fuel Capacity: Around 2.1 gallons (8 liters)
- Dry Weight: Approximately 236 lbs (107 kg)
- Trim-Level Features: As a dedicated motocross bike, there weren't distinct trim levels in the automotive sense. The YZ400 was a single model designed for high performance. Features focused on competition-grade components like high-performance suspension, powerful brakes, and a robust engine built for aggressive riding.
1998 Yamaha YZ400 Specifications
Vehicle Information
| Year | 1998 |
| Make | Yamaha |
| Model | YZ400 |
| 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 | 399CC |
| Engine Size | 399L |
| 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 | - |
Vehicle History Report
Vehicle
Specifications
Specifications
Ownership
History
History
All History
Events
Events
NMVTIS Title
History Check
History Check
Salvage/Rebuilt
Check
Check
Accident
Check
Check
Theft
Check
Check
Open Lien
Check
Check
Past Sale
Listings
Listings
Safety
Recalls
Recalls
Odometer
Check
Check
Market Price
Analysis
Analysis
What Problems Does the 1998 Yamaha YZ400 Have?
The 1998 Yamaha YZ400, like many high-performance motocross bikes of its era, generally had a reputation for robust engineering, but certain aspects could be points of concern for long-term ownership. One common area to watch for on any used two-stroke of this age is the overall condition of the top-end (piston, rings, cylinder). Due to the nature of motocross riding, these components are subject to significant wear. Frequent riders and racers would typically rebuild the top-end every 50-100 hours of use, so a bike with an unknown maintenance history might require immediate attention here.
The clutch can also be a wear item, especially if the bike has been used extensively for racing or in challenging terrain where excessive clutch slipping occurs. Checking for clutch drag or a fading engagement point is advisable. The power valve system, which helps to broaden the powerband, is another component that requires regular maintenance. If not cleaned and lubricated properly, it can become sticky or seize, affecting engine performance. Owners might experience a loss of low-end or mid-range power if the power valve is not functioning correctly.
Suspension components, while high-quality, will eventually require servicing. Leaks from fork seals or a blown rear shock seal can occur over time, leading to degraded damping performance. Regular oil changes and seal replacements are crucial for maintaining optimal suspension action. The frame, while generally strong, can develop cracks or wear at pivot points over many years of hard use, especially if the bike has been involved in significant crashes. While there are no widely publicized recalls for the 1998 YZ400 that stand out, it's always prudent to check with Yamaha for any service bulletins or outstanding safety notices that might have been issued.
In terms of long-term reliability, the electrical system is relatively simple on these bikes, but like any older vehicle, components like the stator or CDI unit can eventually fail. However, these are generally less common issues compared to wear-and-tear items. Overall, the YZ400 is mechanically sound, but consistent maintenance is paramount for sustained reliability.
The clutch can also be a wear item, especially if the bike has been used extensively for racing or in challenging terrain where excessive clutch slipping occurs. Checking for clutch drag or a fading engagement point is advisable. The power valve system, which helps to broaden the powerband, is another component that requires regular maintenance. If not cleaned and lubricated properly, it can become sticky or seize, affecting engine performance. Owners might experience a loss of low-end or mid-range power if the power valve is not functioning correctly.
Suspension components, while high-quality, will eventually require servicing. Leaks from fork seals or a blown rear shock seal can occur over time, leading to degraded damping performance. Regular oil changes and seal replacements are crucial for maintaining optimal suspension action. The frame, while generally strong, can develop cracks or wear at pivot points over many years of hard use, especially if the bike has been involved in significant crashes. While there are no widely publicized recalls for the 1998 YZ400 that stand out, it's always prudent to check with Yamaha for any service bulletins or outstanding safety notices that might have been issued.
In terms of long-term reliability, the electrical system is relatively simple on these bikes, but like any older vehicle, components like the stator or CDI unit can eventually fail. However, these are generally less common issues compared to wear-and-tear items. Overall, the YZ400 is mechanically sound, but consistent maintenance is paramount for sustained reliability.
How long will the 1998 Yamaha YZ400 last?
Estimating average mileage for a 1998 Yamaha YZ400 is challenging as motocross bikes are typically measured in engine hours rather than road miles. A bike used for occasional trail riding might accumulate 20-30 hours per year, while a dedicated racer could easily rack up 50-100+ hours annually. With proper maintenance, the engine's top-end typically requires a rebuild every 50-100 hours. A well-maintained YZ400 could see many years of service, potentially 10-15 years or more for recreational use, but would likely undergo several engine rebuilds and suspension overhauls during that time. The chassis itself is quite durable, but minor wear and tear on components like bearings, chain, and sprockets are expected. Long-term durability hinges entirely on the owner's commitment to regular maintenance, particularly regarding engine internals and suspension upkeep.
What Technology & Safety Features are Included?
The 1998 Yamaha YZ400 is a competition motocross motorcycle, and as such, it is devoid of the technological conveniences, entertainment systems, driver-assistance features, and safety equipment found in modern street-legal vehicles or even many contemporary ATVs. Its design philosophy is purely performance-oriented, stripping away anything that doesn't contribute to speed, handling, or rider control on a closed off-road course.
There are no infotainment systems, GPS navigation, or premium audio setups. Driver-assistance features like ABS, traction control, or stability control are non-existent. Safety features are limited to the inherent capabilities of the motorcycle and the protective gear worn by the rider. This includes powerful hydraulic disc brakes at both the front and rear for strong stopping power, and a robust suspension system designed to absorb impacts and maintain traction over rough terrain. The frame is engineered for strength and rigidity to withstand the stresses of aggressive riding.
Optional features for a motocross bike of this era would typically include aftermarket performance enhancements such as different exhaust systems for more power, upgraded suspension components for specific riding styles or conditions, stronger skid plates for underbody protection, or different gearing. Protective accessories for the rider, such as helmets, body armor, boots, and gloves, are considered essential and are purchased separately. Crash-test ratings are not applicable to off-road motorcycles like the YZ400, as they are not subject to the same regulatory testing as production road vehicles. The primary focus of the YZ400's design is on delivering maximum performance and agility on the track, not on passenger comfort or onboard technology.
There are no infotainment systems, GPS navigation, or premium audio setups. Driver-assistance features like ABS, traction control, or stability control are non-existent. Safety features are limited to the inherent capabilities of the motorcycle and the protective gear worn by the rider. This includes powerful hydraulic disc brakes at both the front and rear for strong stopping power, and a robust suspension system designed to absorb impacts and maintain traction over rough terrain. The frame is engineered for strength and rigidity to withstand the stresses of aggressive riding.
Optional features for a motocross bike of this era would typically include aftermarket performance enhancements such as different exhaust systems for more power, upgraded suspension components for specific riding styles or conditions, stronger skid plates for underbody protection, or different gearing. Protective accessories for the rider, such as helmets, body armor, boots, and gloves, are considered essential and are purchased separately. Crash-test ratings are not applicable to off-road motorcycles like the YZ400, as they are not subject to the same regulatory testing as production road vehicles. The primary focus of the YZ400's design is on delivering maximum performance and agility on the track, not on passenger comfort or onboard technology.
What Colors Options are Available?
We’re working on this section!
In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
1998 Yamaha YZ400 Prices and Market Value
When new in 1998, the Yamaha YZ400 typically retailed in the range of $5,800 to $6,200 USD, reflecting its status as a high-performance motocross machine. As with most off-road vehicles, depreciation is significant and rapid in the first few years. However, the YZ400 has a unique position as an iconic model that bridged the gap to the 4-stroke era, making it somewhat collectible.
Current used market prices for a 1998 YZ400 can vary widely, from around $1,500 for a project bike needing extensive work to $3,000-$5,000+ for a well-maintained, low-hour, or even restored example. Factors affecting resale value include the overall condition, originality of parts, number of engine hours (if known), suspension condition, and whether it has been raced competitively. A bike that has been meticulously cared for and kept in excellent original or restored condition will command a premium. Its depreciation has largely stabilized, and well-preserved examples may even see a slight appreciation due to its historical significance in Yamaha's motocross lineage.
Current used market prices for a 1998 YZ400 can vary widely, from around $1,500 for a project bike needing extensive work to $3,000-$5,000+ for a well-maintained, low-hour, or even restored example. Factors affecting resale value include the overall condition, originality of parts, number of engine hours (if known), suspension condition, and whether it has been raced competitively. A bike that has been meticulously cared for and kept in excellent original or restored condition will command a premium. Its depreciation has largely stabilized, and well-preserved examples may even see a slight appreciation due to its historical significance in Yamaha's motocross lineage.
1998 Yamaha YZ400 Cost of Ownership
Owning a 1998 Yamaha YZ400 can be moderately costly, especially when considering its intended use. Insurance is typically minimal for off-road vehicles, often not requiring full coverage like a street bike. Fuel consumption is high due to its two-stroke nature, demanding premium gasoline and oil for pre-mixing. Maintenance is a significant factor; regular top-end rebuilds (every 50-100 hours), oil changes, filter cleaning, and suspension servicing are essential and add to recurring costs. Repair costs can be moderate, with parts availability being generally good. Overall, while initial purchase price may be lower on the used market, the ongoing costs of fuel, parts, and labor for regular maintenance make it a moderately expensive vehicle to own and operate consistently.
1998 Yamaha YZ400 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
1998 Yamaha YZ400 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
1998 Yamaha YZ400 Insurance
Insurance for a 1998 Yamaha YZ400 is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1998 Yamaha YZ400 Compare to Other Motorcycle?
The 1998 Yamaha YZ400 entered the competitive 400cc two-stroke motocross class, facing stiff competition. Its primary rivals included the Suzuki RM400 (though Suzuki didn't have a direct 400cc two-stroke in '98, their RM250 was a strong contender in its class, and they later introduced the RM-Z450 line), Kawasaki KX400 (similarly, Kawasaki focused on their KX250 and later 4-stroke efforts), and Honda CR400 (Honda's CR250 was the dominant 250cc two-stroke, and they were transitioning to four-strokes with the XR series and eventually the CRF line). The Yamaha YZ400 was notable for its potent, broad powerband, often considered a step above the 250cc class but not quite the explosive power of later 450cc four-strokes. Its suspension, typically Kayaba, was highly regarded for its performance and adjustability.
In terms of features, motocross bikes of this era were relatively stripped down, focusing on performance. The YZ400 offered competitive suspension, strong disc brakes, and a durable chassis. Reliability was generally good for Yamaha during this period, with the YZ line having a strong reputation. However, like all high-strung two-strokes, consistent maintenance was key. Pricing for a new YZ400 was competitive within the 400cc class, positioning it as a premium off-road machine.
**Alternatives:**
In terms of features, motocross bikes of this era were relatively stripped down, focusing on performance. The YZ400 offered competitive suspension, strong disc brakes, and a durable chassis. Reliability was generally good for Yamaha during this period, with the YZ line having a strong reputation. However, like all high-strung two-strokes, consistent maintenance was key. Pricing for a new YZ400 was competitive within the 400cc class, positioning it as a premium off-road machine.
**Alternatives:**
- Similar Alternatives (within the same era): For riders seeking a similar displacement and two-stroke experience from the late 90s, a used KTM 400 EXC or Husqvarna 400 could be considered, though these were often more dual-sport oriented and might have different power characteristics. A meticulously maintained late-model 250cc two-stroke like the Honda CR250R or Kawasaki KX250 offered nimbler handling and quicker revving power, though less outright torque than the YZ400.
- Better Alternatives (more modern): For those looking for more modern technology, easier starting, and potentially smoother power delivery, a 450cc four-stroke motocross bike from the mid-2000s onwards (e.g., Yamaha YZ450F, Honda CRF450R, KTM 450 SX-F) would offer significant advancements in suspension, braking, and overall rider aids. However, these come with a higher price tag and potentially more complex maintenance. For pure trail riding and a similar raw power feel, a modern 300cc two-stroke from brands like KTM or GasGas offers a potent, manageable, and lightweight package.
Final Verdict: Is the 1998 Yamaha YZ400 a Good Motorcycle?
The 1998 Yamaha YZ400 is ideal for experienced motocross or off-road riders who appreciate the raw power and visceral thrill of a large-displacement two-stroke engine. It's a machine for those who understand and can manage its aggressive power delivery, and who are committed to the consistent maintenance required for such a performance-oriented dirt bike. It is worth buying for enthusiasts looking for a piece of motocross history or a potent, albeit demanding, off-road weapon.
Buying one today is strictly in the used market. It is advisable to purchase a YZ400 in the best possible mechanical condition, with clear evidence of regular maintenance. A bike that has been recently rebuilt or has low engine hours will significantly reduce immediate repair costs. For riders seeking a more refined or beginner-friendly experience, modern 250cc two-strokes or 450cc four-strokes would be better suited. The YZ400 is best for experienced riders who value its unique performance characteristics and are prepared for its maintenance demands.
Buying one today is strictly in the used market. It is advisable to purchase a YZ400 in the best possible mechanical condition, with clear evidence of regular maintenance. A bike that has been recently rebuilt or has low engine hours will significantly reduce immediate repair costs. For riders seeking a more refined or beginner-friendly experience, modern 250cc two-strokes or 450cc four-strokes would be better suited. The YZ400 is best for experienced riders who value its unique performance characteristics and are prepared for its maintenance demands.
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.