The 2004 Yamaha YFM660, often referred to as the Grizzly 660, is a highly capable all-terrain vehicle (ATV) that debuted in 2002 and continued through 2008. As a utility-focused quad, its body style emphasizes ruggedness and functionality. While specific trims for the 2004 model year are limited, its core design remained consistent. At its launch, pricing was in the mid-to-high range for its class. It stands out due to its powerful 660cc engine, independent rear suspension, and a robust, go-anywhere reputation that made it a favorite for serious off-road enthusiasts and utility users.
The Good
The 2004 Yamaha YFM660 boasts impressive power and torque for tackling tough terrain, coupled with Yamaha's renowned reliability, offering peace of mind. Its comfortable ride, due to independent suspension, and durable design appeal to both the thrill-seeker and the practical worker seeking a dependable machine.
The Bad
Owners of the 2004 Yamaha YFM660 should watch out for potential issues with the automatic transmission, particularly the belt drive system, which can wear prematurely under heavy use. Some riders also note a slightly heavier feel compared to lighter sport ATVs. Regular maintenance is key.
2004 Yamaha YFM660: Quick Overview
- Engine Options: The 2004 Yamaha YFM660 Grizzly came with a single, potent engine option:
- Type: 660cc, liquid-cooled, SOHC, four-stroke,
- Configuration: Single-cylinder
- Valvetrain: 4 valves
- Horsepower: While Yamaha doesn't officially publish horsepower figures for ATVs of this era, estimates place the YFM660's output in the range of approximately 40-45 horsepower.
- Fuel Economy: Fuel economy figures for ATVs are not typically standardized and vary significantly with riding conditions and style. Expect mileage to be in the range of 15-20 miles per gallon, depending on terrain and throttle input.
- 0-60 Times: Official 0-60 mph times for ATVs are rarely published. Given its engine size and torque, acceleration would be brisk off the line, capable of reaching 60 mph in roughly 8-10 seconds on suitable terrain.
- Towing Capacity: The 2004 Yamaha YFM660 Grizzly is equipped with a robust frame and capable drivetrain, allowing for significant towing. It typically has a towing capacity of around 1,550 pounds (700 kg).
- Trim-Level Features: The 2004 model year for the YFM660 Grizzly was largely a single, well-equipped package focused on utility and trail performance. Key features typically included:
- Push-button On-Command® 4WD system (allowing switching between 2WD, 4WD, and 4WD with differential lock).
- Independent Rear Suspension (IRS) for improved ride comfort and handling over rough terrain.
- Shaft drive for low maintenance and reliability.
- Disc brakes front and rear for strong stopping power.
- Durable, corrosion-resistant steel frame.
- Integrated headlights and taillight.
- Digital LCD meter with speedometer, odometer, trip meter, clock, and 4WD indicator.
- Large-capacity fuel tank (around 4.2 gallons).
- Front and rear cargo racks for carrying gear.
- High-mounted, wide-ratio automatic transmission (V-belt).
- Under-seat maintenance access.
- Electric starter with a backup pull-start.
2004 Yamaha YFM660 Specifications
Vehicle Information
| Year | 2004 |
| Make | Yamaha |
| Model | YFM660 |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Low Speed Vehicle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | KAKEGAWA |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 660CC |
| Engine Size | 660L |
| Engine Cylinders | 1 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | Rear-Wheel Drive |
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 2004 Yamaha YFM660 Have?
The 2004 Yamaha YFM660 Grizzly, while generally a robust machine, does have a few commonly reported issues that owners should be aware of. One of the most frequently mentioned concerns revolves around the automatic transmission, specifically the V-belt and its associated clutch components. Under strenuous use, such as aggressive trail riding, mud bogging, or frequent heavy towing, the drive belt can experience premature wear or even snap. This is not necessarily a flaw in design but often a result of exceeding the intended operating parameters or neglecting belt inspection and replacement. The secondary clutch, which engages with the belt, can also be a point of wear over time.
Another area some owners have noted is the carburetor. While reliable, it can sometimes be susceptible to clogging if stale fuel is used or if the machine is stored for extended periods without proper fuel stabilization. This can lead to starting issues, rough idling, or loss of power. Cleaning and proper fuel maintenance are crucial.
Regarding electrical systems, while generally solid, some instances of starter solenoid failure have been reported, though this is not widespread. The cooling system, though liquid-cooled, requires regular attention to coolant levels and radiator cleanliness to prevent overheating, especially in demanding conditions.
Specific to the 2004 model year, there are no major widespread recalls that significantly impacted its overall long-term reliability across the board. Yamaha's engineering for this generation of Grizzly was well-regarded for its durability. However, as with any vehicle of this age, proactive maintenance is paramount. Addressing minor issues promptly, such as worn suspension bushings or brake component checks, will contribute significantly to the YFM660's longevity. The engine itself is known for being a workhorse, often capable of enduring hundreds of hours of operation with proper care and oil changes. Owners who consistently perform routine maintenance, inspect consumables like belts and filters, and ride within the machine's capabilities generally report very few major mechanical failures.
Another area some owners have noted is the carburetor. While reliable, it can sometimes be susceptible to clogging if stale fuel is used or if the machine is stored for extended periods without proper fuel stabilization. This can lead to starting issues, rough idling, or loss of power. Cleaning and proper fuel maintenance are crucial.
Regarding electrical systems, while generally solid, some instances of starter solenoid failure have been reported, though this is not widespread. The cooling system, though liquid-cooled, requires regular attention to coolant levels and radiator cleanliness to prevent overheating, especially in demanding conditions.
Specific to the 2004 model year, there are no major widespread recalls that significantly impacted its overall long-term reliability across the board. Yamaha's engineering for this generation of Grizzly was well-regarded for its durability. However, as with any vehicle of this age, proactive maintenance is paramount. Addressing minor issues promptly, such as worn suspension bushings or brake component checks, will contribute significantly to the YFM660's longevity. The engine itself is known for being a workhorse, often capable of enduring hundreds of hours of operation with proper care and oil changes. Owners who consistently perform routine maintenance, inspect consumables like belts and filters, and ride within the machine's capabilities generally report very few major mechanical failures.
How long will the 2004 Yamaha YFM660 last?
Based on owner data and typical usage patterns, the 2004 Yamaha YFM660 Grizzly can realistically achieve an average of 5,000 to 10,000 miles or more over its lifespan, often translating to 10-15 years of service, provided it receives consistent and proper maintenance. Its long-term durability is a strong suit, particularly the engine and frame, which are built for toughness. Weaknesses that tend to appear over extended use, as mentioned, include wear on the automatic transmission's V-belt and clutches. Suspension components and wheel bearings may also require attention after many miles or years of exposure to the elements and rough terrain. Overall, with diligent upkeep, the YFM660 is known for its resilience and ability to remain a functional and enjoyable machine for many years.
What Technology & Safety Features are Included?
The 2004 Yamaha YFM660 Grizzly, by its nature as a utility-focused ATV from this era, prioritizes function over advanced technology and entertainment. It lacks the modern digital dashboards, infotainment systems, or connectivity features found in contemporary vehicles.
Built-in Tech: The primary technological feature is the Yamaha's signature On-Command® 4WD system. This electronic push-button system allows the rider to seamlessly switch between 2WD, 4WD, and 4WD with differential lock on the fly, enhancing traction and control in varying terrain. The instrument panel is a simple but effective LCD display that provides essential information: speedometer, odometer, trip meter, clock, and a 4WD indicator. It's functional and easy to read, designed for practicality rather than flash.
Entertainment: There are no built-in entertainment features like audio systems or connectivity options. The focus is entirely on the off-road experience.
Driver-Assistance Features: Driver-assistance features, as understood in automotive terms, are non-existent. The YFM660 relies on the rider's skill and judgment. The 4WD system and robust braking do provide a level of operational assistance for navigating challenging environments.
Safety Features: Safety on the YFM660 is primarily derived from its mechanical design and rider awareness. It features hydraulic disc brakes front and rear, providing strong stopping power. The independent rear suspension contributes to stability and a more controlled ride, reducing the risk of rollovers on uneven ground. The sturdy steel frame offers a degree of protection. Unlike cars, ATVs do not undergo standardized crash-test ratings. Safety is heavily dependent on the rider wearing appropriate protective gear (helmet, goggles, gloves, boots, and body armor) and operating the machine responsibly within its limits.
Optional Features: While the 2004 model came with a standard feature set, optional accessories available from Yamaha or aftermarket manufacturers could enhance its utility and protection. These might include winches, gun scabbards, windshields, handguards, and upgraded lighting. These accessories do not alter the core technological or safety features of the base vehicle.
Built-in Tech: The primary technological feature is the Yamaha's signature On-Command® 4WD system. This electronic push-button system allows the rider to seamlessly switch between 2WD, 4WD, and 4WD with differential lock on the fly, enhancing traction and control in varying terrain. The instrument panel is a simple but effective LCD display that provides essential information: speedometer, odometer, trip meter, clock, and a 4WD indicator. It's functional and easy to read, designed for practicality rather than flash.
Entertainment: There are no built-in entertainment features like audio systems or connectivity options. The focus is entirely on the off-road experience.
Driver-Assistance Features: Driver-assistance features, as understood in automotive terms, are non-existent. The YFM660 relies on the rider's skill and judgment. The 4WD system and robust braking do provide a level of operational assistance for navigating challenging environments.
Safety Features: Safety on the YFM660 is primarily derived from its mechanical design and rider awareness. It features hydraulic disc brakes front and rear, providing strong stopping power. The independent rear suspension contributes to stability and a more controlled ride, reducing the risk of rollovers on uneven ground. The sturdy steel frame offers a degree of protection. Unlike cars, ATVs do not undergo standardized crash-test ratings. Safety is heavily dependent on the rider wearing appropriate protective gear (helmet, goggles, gloves, boots, and body armor) and operating the machine responsibly within its limits.
Optional Features: While the 2004 model came with a standard feature set, optional accessories available from Yamaha or aftermarket manufacturers could enhance its utility and protection. These might include winches, gun scabbards, windshields, handguards, and upgraded lighting. These accessories do not alter the core technological or safety features of the base vehicle.
What Colors Options are Available?
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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.
2004 Yamaha YFM660 Prices and Market Value
When new, the 2004 Yamaha YFM660 Grizzly typically retailed in the range of $7,000 to $8,000 USD, depending on dealer pricing and any minor regional variations. As a used vehicle, its value today varies considerably based on condition, mileage, and maintenance history. Well-maintained examples in good working order can often be found for $3,000 to $5,000.
The YFM660 has experienced moderate depreciation, which is typical for ATVs. However, its reputation for reliability and capability helps it retain value better than some less robust models. Factors significantly affecting resale value include the condition of the tires, body plastics, engine performance, and the functionality of the 4WD system. Examples with low hours/miles, minimal wear and tear, and evidence of regular servicing will command higher prices. Conversely, machines with extensive modifications, visible damage, or signs of neglect will depreciate more rapidly.
The YFM660 has experienced moderate depreciation, which is typical for ATVs. However, its reputation for reliability and capability helps it retain value better than some less robust models. Factors significantly affecting resale value include the condition of the tires, body plastics, engine performance, and the functionality of the 4WD system. Examples with low hours/miles, minimal wear and tear, and evidence of regular servicing will command higher prices. Conversely, machines with extensive modifications, visible damage, or signs of neglect will depreciate more rapidly.
2004 Yamaha YFM660 Cost of Ownership
Owning a 2004 Yamaha YFM660 Grizzly is generally considered moderately economical, especially when compared to more complex or specialized vehicles. Insurance costs are typically lower than for cars or motorcycles, often available through specialized ATV policies or as an add-on to homeowner's insurance. Fuel consumption, averaging 15-20 mpg, is reasonable for its class. Routine maintenance, including oil changes and belt inspections, is straightforward and cost-effective. Major repairs, though infrequent if maintained, can be costly due to parts availability and specialized labor. Overall, the YFM660 offers good value, with the bulk of long-term costs being fuel and preventative maintenance rather than unexpected major expenditures.
2004 Yamaha YFM660 Fuel Efficiency
Fuel Type
Gasoline
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
2004 Yamaha YFM660 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
2004 Yamaha YFM660 Insurance
Insurance for a 2004 Yamaha YFM660 is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2004 Yamaha YFM660 Compare to Other Motorcycle?
The 2004 Yamaha YFM660 Grizzly competed in the popular large-bore utility ATV segment against formidable rivals like the Honda Foreman 500, Suzuki TwinPeaks 700, and Polaris Sportsman 700.
Performance: The YFM660's 660cc engine offered strong torque and respectable power, making it excellent for pulling, climbing, and general trail riding. It often held an edge in raw power and torque over the Foreman 500 but was generally matched or slightly outgunned by the 700cc class competitors from Suzuki and Polaris, particularly in straight-line acceleration.
Features: Yamaha's On-Command® 4WD system with differential lock was a standout feature, offering versatile traction control. Its independent rear suspension (IRS) provided a more comfortable ride than some solid-axle competitors. The Suzuki TwinPeaks 700 also featured IRS and a potent engine. The Polaris Sportsman 700 was known for its independent suspension on all four wheels and powerful engine, often considered a benchmark for comfort and performance. The Honda Foreman 500, while reliable, typically featured a solid rear axle, which could be less comfortable on rough terrain, and a slightly smaller engine displacement.
Reliability: Yamaha has a stellar reputation for reliability, and the YFM660 generally lived up to this. While the belt drive system could be a point of wear, the engine and drivetrain were robust. Honda is legendary for its durability, often considered the benchmark in this regard. Suzuki and Polaris also offered good reliability, though some Polaris models from this era had more complex electrical systems that could be prone to issues.
Price: The YFM660 was competitively priced, usually falling between the slightly less expensive Honda Foreman and the often pricier Polaris Sportsman 700 and Suzuki TwinPeaks 700.
Alternatives:
- Similar: If seeking similar performance and reliability, the Polaris Sportsman 700 offers comparable power and a more plush ride with its four-wheel independent suspension, but potentially at a higher used price point. The Suzuki TwinPeaks 700 is also a direct competitor with strong performance.
- Potentially Better (depending on needs): For riders prioritizing ultimate reliability and a simpler, bulletproof drivetrain, the Honda Foreman 500 is an excellent choice, though it sacrifices some comfort and outright power. If seeking more modern features and potentially better suspension, newer model years of any of these brands would be worth considering, but would come at a significantly higher price.
Performance: The YFM660's 660cc engine offered strong torque and respectable power, making it excellent for pulling, climbing, and general trail riding. It often held an edge in raw power and torque over the Foreman 500 but was generally matched or slightly outgunned by the 700cc class competitors from Suzuki and Polaris, particularly in straight-line acceleration.
Features: Yamaha's On-Command® 4WD system with differential lock was a standout feature, offering versatile traction control. Its independent rear suspension (IRS) provided a more comfortable ride than some solid-axle competitors. The Suzuki TwinPeaks 700 also featured IRS and a potent engine. The Polaris Sportsman 700 was known for its independent suspension on all four wheels and powerful engine, often considered a benchmark for comfort and performance. The Honda Foreman 500, while reliable, typically featured a solid rear axle, which could be less comfortable on rough terrain, and a slightly smaller engine displacement.
Reliability: Yamaha has a stellar reputation for reliability, and the YFM660 generally lived up to this. While the belt drive system could be a point of wear, the engine and drivetrain were robust. Honda is legendary for its durability, often considered the benchmark in this regard. Suzuki and Polaris also offered good reliability, though some Polaris models from this era had more complex electrical systems that could be prone to issues.
Price: The YFM660 was competitively priced, usually falling between the slightly less expensive Honda Foreman and the often pricier Polaris Sportsman 700 and Suzuki TwinPeaks 700.
Alternatives:
- Similar: If seeking similar performance and reliability, the Polaris Sportsman 700 offers comparable power and a more plush ride with its four-wheel independent suspension, but potentially at a higher used price point. The Suzuki TwinPeaks 700 is also a direct competitor with strong performance.
- Potentially Better (depending on needs): For riders prioritizing ultimate reliability and a simpler, bulletproof drivetrain, the Honda Foreman 500 is an excellent choice, though it sacrifices some comfort and outright power. If seeking more modern features and potentially better suspension, newer model years of any of these brands would be worth considering, but would come at a significantly higher price.
Final Verdict: Is the 2004 Yamaha YFM660 a Good Motorcycle?
The 2004 Yamaha YFM660 Grizzly is an ideal choice for recreational riders and utility users who demand capable off-road performance without needing cutting-edge technology. It's perfect for trail exploration, light farm work, or hunting expeditions.
It is absolutely worth buying, especially on the used market, for those seeking a durable, powerful, and reliable ATV at a reasonable price. Its strengths lie in its potent 660cc engine, effective 4WD system, and comfortable independent rear suspension.
When purchasing, focus on finding a well-maintained used model. Inspect the drive belt, clutch, and overall condition meticulously. While it wasn't offered in multiple trims, any well-cared-for 2004 YFM660 will offer substantial value and many years of service for the right owner. Buying used is the only practical option now, and prioritizing condition over low mileage is key.
It is absolutely worth buying, especially on the used market, for those seeking a durable, powerful, and reliable ATV at a reasonable price. Its strengths lie in its potent 660cc engine, effective 4WD system, and comfortable independent rear suspension.
When purchasing, focus on finding a well-maintained used model. Inspect the drive belt, clutch, and overall condition meticulously. While it wasn't offered in multiple trims, any well-cared-for 2004 YFM660 will offer substantial value and many years of service for the right owner. Buying used is the only practical option now, and prioritizing condition over low mileage is key.
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.