When it comes to overall performance and design, the quote, the Yamaha Grizzly 660 is perhaps the complete embodiment of the quote, “History is written by champions.” First released in 2002, Yamaha based the Grizzly from the Raptor’s engine design. Though it’s not endowed with the Raptor’s sleek aesthetics, this juggernaut makes it up on features that make this quad the perfect workhorse.
Despite having a brief production run of six years, the Grizzly had the opportunity to showcase its features with big-bored competitors, like the Outlander and Ranger. Even though this four-wheeler had some difficulty outclassing some of its rivals, the Grizzly still stood out in some ways.
With mud and snow trails being one of its strengths, the Yamaha Grizzly 660 proves to be a favourite among aggressive trail riders and experienced adventure seekers. Also, its reliable superior suspension design gives the Grizzly outstanding manoeuvrability across rough, uneven trails. Even better is its ability to haul heavy loads, which make the Yamaha Grizzly 660 a perfect vehicle for camping, hunting, and backbreaking grunt work, either on the farm or ranch.
The Grizzly’s Ultramatic CVT system and the Independent Rear Suspension offer riders a smoother riding experience. Moreover, its four-stroke, single-cylinder engine gives this 600-pounder the ability to run an astonishing 70 mph, making the Yamaha Grizzly 660 one of the pound-for-pounders in the off-roading arena.
Does the Yamaha Grizzly 660 Have Models?
Yamaha consistently released different models of the Grizzly 660 during its brief production run of six years, which began in 2002 and ended in 2007. Alongside those base units, the years 2002 and 2005 to 2007 also saw different trims of the Grizzly. Overall, Yamaha came up with more than a dozen units during the Grizzly 660’s brief yet successful run.
| Year | Model (Base) |
| 2002 Yamaha Grizzly 660 | YFM660FPE |
| 2003 Yamaha Grizzly 660 | YFM660FR |
| 2004 Yamaha Grizzly 660 | YFM660FS |
| 2005 Yamaha Grizzly 660 | YFM660FAT (4WD) |
| 2006 Yamaha Grizzly 660 | YFM66FAV (4WD) |
| 2007 Yamaha Grizzly 660 | YFM66FGW |
| Year | Model |
| 2002 Yamaha Grizzly 660 | YFM660FHP (Hunter) |
| 2005 Yamaha Grizzly 660 | YFM66FAHT (Camo, 4WD) |
| 2005 Yamaha Grizzly 660 | YFM66FASET (Special Edition, 4WD) |
| 2006 Yamaha Grizzly 660 | YFM66FABGHV (Outdoorsman Edition, Camo, 4WD) |
| 2006 Yamaha Grizzly 660 | YFM66FAHDV (Ducks Unlimited Edition) |
| 2006 Yamaha Grizzly 660 | YFM66FAHV (Camo, 4WD) |
| 2007 Yamaha Grizzly 660 | YFM66FGHW (Camo) |
How Much Is a Yamaha Grizzly 660?
The suggested price for the Yamaha Grizzly 660 varies depending on the year the unit was made. The same concept applies to the low and average retail values, which may range from $1,560 to $3,658. These rates are based on www.nadaguide.com.
As for trade-in values of used Grizzly 660, the rates may range from $2,025 to $2,540. These values are dependent on the condition and mileage of the vehicle.
For more information on the current prices of the Yahama Grizzly 660 on the market, you may turn to the list provided below. This information is based on www.nadaguide.com and www.atv.com.
| Prices Based on www.nadaguide.com | ||
| Models | Suggested List Price | Warranty |
| 2002 Yamaha Grizzly 660 | $6,999 | — |
| 2003 Yamaha Grizzly 660 | $7,099 | — |
| 2004 Yamaha Grizzly 660 | $7,099 | 6 months |
| 2007 Yamaha Grizzly 660 | $7,199 | 6 months |
| Prices Based on www.atv.com | ||
| Models | Suggested List Price | Warranty |
| 2005 Yamaha Grizzly 660 | $7,199 | 6 months |
| 2006 Yamaha Grizzly 660 | $7,199 | 6 months |
Specifications and Features of the Yamaha Grizzly 660
Engine
The Yamaha Grizzly 660 sports a four-stroke, single-cylinder single overhead cam engine, with a bore of 3.94 inches (100 mm) and a stroke of 3.31 inches (84 mm). The liquid- and air-cooled engine, which has a displacement of 660 cubic centimetres, uses a BSR42/1Mikuni carburettor that’s 42 mm in size. The Grizzly 660 utilizes an oil bath air filter to screen out particles for a better air-fuel mixture.
Lubrication and Fuel Requirement
The Yamaha Grizzly 660 uses unleaded gasoline with a grade of RON 91 or PON 82 or higher. Also, you’ll be wise to avoid gasohol—or gasoline alternatives—that contain more than 10% ethanol to maintain satisfactory engine performance. Moreover, stay away from gasohol with methanol because, according to Yamaha, this type of fuel can cause severe engine damage and other major issues.
As for the oil requirement, the Grizzly 660 uses SAE 5W30 for extremely low outdoor temperatures. On the other hand, you may use Yamalube SAE 10W30 and 20W40 when the outside temperature goes up to 10 degrees to 90+ degrees and 50+ degrees Fahrenheit, respectively.
As for the recommended oil classification, API service SF, SG, and SE can be used on the Grizzly’s engine. Meanwhile, the recommended oil classification for the final and differential gears is SAE 80 API GL-4 Hypoid gear oil.
Ignition
This quad is equipped with a push-button starter, which is connected to a CDI ignition system. It also has a recoil starter which serves as a backup. In addition, this vehicle uses a magneto generator to power up its electronics. The correct battery and spark plug types for the Grizzly 660 are a YTX20L-BS battery (with a capacity of 12 V, 18 Ah) and an NGK DPR8EA-9, respectively. The spark plug has a gap of 0.8 ~ 0.9 mm in size (0.031 ~ 0.035 inches)
Drivetrain/Transmission
The Grizzly 660 has a left-handed operation for its Ultramatic transmission and clutch systems. This four-wheeler uses a V-belt and shaft drive for the former, while a wet, centrifugal automatic for the latter. What makes this utility off-roader different from the other ATVs is its gearshift which is located on the left side of the vehicle, directly above the left front wheel. The Grizzly has a low and high range transmission, as well as a reverse gear.
The Grizzly 660 has a secondary reduction ratio of 39/24 x 24/18 x 33/9 (7.944). Additionally, the gear ratios for the reverse and sub-transmission range are as follows:
- Low Sub-transmission — 37/12 (2.466)
- High Sub-transmission — 28/19 (1.473)
- Reverse — 25/17 (1.471)
What’s more, the Grizzly boasts the On-Command™ system, which allows riders to drive in 2WD, limited differential, or 4WD mode with a quick push of a button. This feature adds convenience and practicality to a driver’s trail-riding experience.
Tyres and Brakes
The stock Grizzly 660 is fitted with tubeless Dunlop tyres—AT25 x 8-12 (KT131) for the front and AT25 x 10-12 (KT135) for the rear. The standard front tyre air pressure requirement for the 2002 Yamaha Grizzly 660 should be 35 kPa (0.35 kgf/cm2, 5 psi), and 30 kPa (0.30 kgf/cm2, 4.3 psi) for the rear. For a minimum tyre air pressure requirement, the front tyre air pressure should be 32 kPa (0.32 kgf/cm2, 4.6 psi), while the rear tyre should have 27 kPa (0.27 kgf/cm2, 3.9 psi) of air pressure.
As for the brakes, the Grizzly has a dual disc brake system, which is operated using the right-hand lever. Alternatively, a single disc brake is situated in the rear and is operated using the left hand or right foot lever. When in 4WD mode, in which the rear and front wheels are connected, using any of the aforementioned brakes will effectively stop the ATV.
Suspension
The Yamaha Grizzly 660 has front and rear independent double-wishbone suspension systems, which provides it with exceptional manoeuvrability. Both suspension systems have adjustable preload designs, which allow riders to have higher ground clearance if needed. This quad is fitted with spring coil/oil damper shock absorbers for a smoother ride.
The front and rear wheels of the Grizzly has wheel travel of 7.1 inches (180.3 mm) and 9.5 inches (241.3 inches). This feature gives this four-wheeler a decent turning radius of 10.5 feet.
Dimension and Weight
Overall, the Yamaha Grizzly 660 has a length of 82.1 inches (2,085 mm), a width of 45.3 inches (1,150 mm), and a height of 47.6 inches (1,210 mm). It has a wheelbase of 50.2 inches (1,275.1 mm) and an awesome ground clearance of 10.8 inches (275 mm). The seat height is 34.6 inches (878.8 mm). The stock Grizzly has a curb weight of 639 lbs. (290 kg), while the dry weight is 600 lbs. (272 kg).
Load and Tow Capacity
As a heavy-lifting workhorse, the Yamaha Grizzly 660 can tow a massive 1,212 lbs. (549.8 kg). Its tongue hitch can also withstand and pull the same amount of weight, which is not as surprising, considering how much this juggernaut weighs.
The Grizzly 660 has a sizable tank that can take in 20 litres (5.3 US gal) of fuel and a reserve fuel tank with a 3.5 litres (0.92 US gal) capacity. Moreover, the overall oil quantity required for this quad is as follows:
- For oil filter change — 2 litres (2.1 US quarts)
- For draining — 1.9 litres (2 US quarts)
- For disassembly — 2.3 litres (2.2 US quarts)
External Features
This one-seater utility ATV has a steel tube frame and durable plastic material. The frame has a trail of 26 mm and a caster angle of 5 ̊. The Yamaha Grizzly 660 also comes with a digital display that’s equipped with an odometer, speedometer, trip meter, fuel gauge, gear position, and an hour meter. The display also features a temperature warning indicator and a clock.
The switches on the left handlebar are composed of the rear brake lever, light switch, engine stop switch, and start switch. On the other hand, the front brake lever, the buttons for the 2WD/4WD differential lock and the On-Command™ system are located on the right handlebar, with the inclusion of a lever selector switch. It also has a rear brake pedal on the left side of the vehicle.
The Grizzly 660 comes complete with front and rear fenders and bash plates. As if those were not enough, this vehicle is also protected with a front bumper and a full-length skid plate that covers and protects the underside.
What Is the Top Speed of the Yamaha Grizzly 660?
The Yamaha Grizzly 660 has a top speed of 70 mph. This quad has a horsepower of 40.9 hp. Some owners, however, claim that the Grizzly can go up to 42 horsepower, which is as mentioned in the Grizzly’s manufacturer’s certificate of origin (MCO).
That number is highly exceptional, considering the size and weight of the Grizzly. However, if you want to increase the horsepower of your TV, there are some tricks can turn your Grizzly 660 into a charging behemoth of metal and machine.
Air Filter
Cleaning the air filtration system regularly can help improve your quad’s horsepower. Alternatively, purchasing a high-quality aftermarket air filter, like a Pro Flow K&N air filter. There’s a study that claims air filters of superior make can improve a vehicle’s performance as compared to OEM brands.
Slip-on Exhaust
Let’s face it: the Grizzly 660 indeed sports a neat muffler. However, that does nothing to improve its power. The idea behind this method is that a better slip-on exhaust eliminates air resistance which prevents your quad from gaining the power it needs. For that matter, you can procure an aftermarket mufflers-only or slip-on exhaust to turn your Grizzly into a real legend, which it already is.
Lighter Tyres
There is a wide variety of selections when it comes to choosing lighter, durable tyres for your Yamaha Grizzly 660. Some Grizzly owners attest to using tyre brands, like a 25” PitBull Growler or a 26” Maxxis Bighorn. The 21” and 25” Kenda Bearclaw HTRs may also do the trick.
What Are the Pros and Cons of a Yamaha Grizzly 660?
There’s no doubt that the Yamaha Grizzly 660 performs well as a robust workhorse, especially in seemingly impassable terrain, like deep mud and snow. However, even something as grand as the Grizzly 660 has its own limitations. Below are the pros and cons of this all-terrain vehicle, as well as some add-ins.
The Good
Remarkable Differential and Suspension System
Apart from the easy, push-button design of the On-Command™ system, the Yamaha Grizzly 660 has a responsive differential locking system that provides great handling and smoother driving. Also, the independent double-wishbone suspension damps any unwanted vibration. So whether you’re driving across icy terrain, hard packs, mud trails, or swamp holes, the Grizzly 660 is sure to give you an amazing ride, thanks to these features.
Excellent Ergonomics
When it comes to ergonomics, the Grizzly 660 tops it all. The handlebars are just of the right height. The controls, such as the locking differential and driveline selector, do not require a huge amount of effort to operate. Apart from that, the seat isn’t stiff, nor it is too soft; it offers the right amount of comfort and convenience to the rider. For that matter, the Grizzly may be a mean machine, but it has a soft spot for the driver.
Complete and Easy-to-Read Gauges
The digital display immediately provides the rider with the information they need as it comes with a speedometer, fuel indicator, odometer, trip meter, a clock, and a gear position indicator. Putting the indicator and gauges in a single location isn’t just practical and convenient, but it also lessens the likelihood of getting distracted.
The Bad
Stability
The Yamaha Grizzly 660’s high ground clearance can be perfect for some drivers. However, that feature can be a tradeoff in terms of stability. Unlike lower ATVs, the Grizzly may tend to get tippy when moving across extremely uneven terrain, such as berms or arroyos.
Selective Gas Requirement
Every engine performs and runs smoothly if given the right type of fuel. In the case of the Yamaha Grizzly 660, though, having the correct fuel type for this ATV may require a little more extra, which can become a hassle at some point for some riders. Unless you have quick access to the gasoline with the correct octane grade and alcohol content, you may want to keep a tank or two handy for your ATV.
Gas Guzzler
There are ATV owners who have complained that their Grizzly 660s consume a lot of fuel while trail riding. They have observed that their 660s have yielded low mileage even after using up the entire fuel tank. Some riders attribute this issue to the mods and other upgrades they have put on their ATVs. Apart from that, driving in high gear while traversing steep elevations may also affect gas consumption.
And the Add-Ins (More Benefits and Disadvantages)
Additional Benefits
- The double-wishbone suspension system provides superior manoeuvrability and reliability.
- The suspension comes with an adjustable fork preload, which enable riders to adjust the height of the ATV without turning to aftermarket alternatives, such as lift kits or larger tires.
- The high ground clearance allows riders to ride through bumpy, uneven trails without a hitch.
- Unlike most ATVs, the Grizzly is perfect for traversing muddy terrains or areas with shallow waters because it doesn’t stall.
- A full underside skid plate protects the crucial components underneath the quad.
- Its powerful engine can create a lot of torque.
- It can haul twice the amount of its entire weight.
Additional Disadvantages
- Gauge glares—or bright light reflecting from the display to the rider’s eyes—can distract or inconvenience the rider while driving.
- The turning radius can be an issue to trail riders, especially when making tight turns.
- Older models of the Grizzly 660 tend to burn oil more.
What Makes the Yamaha Grizzly 660 an Ideal Outdoor Vehicle?
As one of the few to join the pack of big-bore ATVs, the Yamaha Grizzly 660 packs quite a punch in terms of power. The amount of horsepower and torque this quad produces with its four-stroke, 686-cc, single overhead cam engine is astonishing.
Also, the independent double-wishbone suspension works like a charm for this heavy-lifter. With its high ground clearance, the Grizzly can make any seemingly unpassable terrain passable.
The On-Command™ driveline and differential-lock system enable this quad to traverse whatever terrain you put it on. Plus, its driveline system makes this four-wheeler a reliable machine. Therefore, whether you love riding on snow, muddy, or swampy trails—or whatever outdoor terrain you can get your hands on—the Yamaha Grizzly is sure to get the job for you.
About the Manufacturer
Yamaha Motor Company, Limited is one among several companies under the Yamaha Corporation, which is one of the largest manufacturers of pianos worldwide. The multinational firm focuses on the production of musical instruments, motorcycles, and other electronic equipment. The Yamaha Grizzly 660 is one among several of its noteworthy ATVs. Headquartered in Naka-Ku, Hamamatsu, Shizuoka, Japan, Yamaha is known for developing some of the world’s firsts: a digital synthesizer and a CD recorder. Currently, the Japanese company produces snowmobiles, fishing and utility boats, semiconductors, industrial robots, and automobile engines, among others.
Final Takeaway
Though the Yamaha Grizzly 660 may appear average beside its strong competitors, such as the Rincon, Ranger, or Outlander, its impressive qualities and reliable capabilities are not that ignorable. The power this quad yields—thanks to its big-bored, 686-cc engine—makes the Grizzly not just a perfect workhorse for hardworking folks, but the 660 is also a fantastic outdoor vehicle for trail enthusiasts.
With its exceptional handling and damping features, the Grizzly 660 can take on muddy or swampy terrain, making it a suitable ride for forest trail explorations. Coupled with its remarkable braking system, superb drivetrain and differential-lock system, the Yamaha Grizzly 660 is, overall, a classic champion on ATV innovation.
