Yamaha Grizzly 660 Specs and Review 2022

Yamaha Grizzly 660: The last millennium witnessed the rise of V belt transmission four-stroke, fuel injection, and The Yamaha Grizzly 660. 

In close proximity to that of the Raptor, this nearly-big-bore machine tackled its predecessor’s weaknesses when it made its debut on the ATV scene back in.

Yamaha Grizzly 660

It was sporty in appearance and a powerful engine and a functional design that was as enjoyment on the ranch, just and in the dirt.

The Yamaha Grizzly 660 was a spin-off of the Raptor 660, produced from 2001 until 2006. Fondly known as The Bear or Grizzly it was a four-wheeler that featured a more sporty appearance as well as the Ultramatic transmission, as well as an enhanced suspension. 

These distinctive features made the quad the ideal vehicle for outdoor activities and chores.

Execution is everything and Yamaha has done a great job on this front by introducing the Yamaha Grizzly 660. 

Together with its most difficult rivals like its rivals the Ranger, Sportsman, and Rincon The machine consistently offered the most thrilling riding experience to the trail and aggressive riders. 

It’s possible to consider it outdated or a bit shabby by modern standards however when it first was first released it was a truly unique 4×4. Read on to relive the glory times in the Grizzly.

Yamaha Grizzly 660

The Mega ATV, Overhauled

The Yamaha Raptor 660, considered the ultimate sport quad gained the prestigious reputation it has earned that Yamaha thought it was best to come up with a different model with its engine from this legendary vehicle. Thus in 2002, the Yamaha Grizzly 660 was born. It was different from its predecessor.

The Grizzly was not equipped with dual carburetors. It did however have the robust 44-millimeter Keihin carburetor, a five-valve cylinder head, an independent double-wishbone suspension as well as hydraulic disc brakes, instantly making it among the top four-wheelers of its class.

The vehicle was manufactured from 2001 until the year 2006 (for models manufactured between 2002 and 2007) the rec-utility vehicle was on the market for six years. 

It came with a completely constructed chassis that was specifically designed to fix the largest flaws of its stablemate which was the Raptor. 

Double-A-arm independent suspension on all fours and sway bars replacing the old front MacPherson struts with better struts as well as back swingarm suspension. 

The model also featured the option of a front differential lock that was pushed and a piece of improved equipment.

Yamaha Grizzly 660 Models

The Grizzly featured a variety of trims throughout its production, including:

Year Model
2002 Yamaha Grizzly 660 YFM660FPE
2002 Yamaha Grizzly 660 YFM660FHP Hunter
2003 Yamaha Grizzly 660 YFM660FR
2004 Yamaha Grizzly 660 YFM660FS
2005 Yamaha Grizzly 660 YFM66FAHT (4WD, Camouflage)
2005 Yamaha Grizzly 660 YFM66FASET Special Edition (4WD)
2005 Yamaha Grizzly 660 YFM660FAT (4WD)
2006 Yamaha Grizzly 660 YFM66FABGHV Outdoorsman Edition (4WD, Camouflage)
2006 Yamaha Grizzly 660 YFM66FAHDV Ducks Unlimited Edition
2006 Yamaha Grizzly 660 YFM66FAHV (4WD, Camouflage)
2006 Yamaha Grizzly 660 YFM66FASEV Special Edition (4WD)
2006 Yamaha Grizzly 660 YFM66FAV (4WD)
2007 Yamaha Grizzly 660 YFM66FGHW (Camouflage)
2007 Yamaha Grizzly 660 YFM66FGW

Yamaha supplied the Grizzly 660 to such a high standard that it remained among the quads that had the highest sales and popularity despite the advent of multi-cylinder beasts in the rivals. 

It wasn’t until the rapid advancement of technology in 2007 that Yamaha needed to upgrade the Grizzly to incorporate an ECU that was 32-bit that could power the steering system, as well as a 44mm throttle body for fuel injection and a bigger displacement of 700 cubic centimeters. 

Furthermore, cost-efficiency as well as the desire to reduce weight led to the Grizzly changing to a four-valve piston head, a revamped frame, and suspension. It also lost the pull-starter that was mechanically attached to it.

Yamaha Grizzly 660 Price

Yamaha Grizzly 660 Price

The initial list price at the time of 2002 was $6999 and $7,299 in The Hunter Edition. The base model’s price just increased to $7,199 in the last year of production. 

The price was only slightly higher in trims that were Hunter Edition trims $7,949 (2006 Outdoorsman Edition) and $7,699 (2006 Ducks Unlimited Edition). 

The Special Edition for 2006 Special Edition cost $7,599, which was a more sleek appearance and just $50 more expensive than the 2007 camouflage trim.

Kelley Blue Book values are between $2,275 and $4,000 with the 2006 models having the highest value due to the variety of trims that were released during the year. 

Values for trade-ins are $1,990 to $2,700 for vehicles in good shape and with normal mileage. Modifications and other accessories can boost the value of the vehicle. However, second-hand Grizzlies vary from $1,700 to $2,100.

However, they are rare on auction and trader websites. Certain units available for bidding are shipped for free. Beware of quads sold at less than $1500, because they could have shafts that aren’t working batteries that are weak, or plastics that have deteriorated.

Yamaha Grizzly 660 Specs

  • Engine The engine is a four-stroke, liquid-cooled single-cylinder SOHC engine. The forward-inclined engine has a bore-stroke ratio of 84 millimeters (3.94 3.31 inches). 3.31 inches). It has a displacement of 660 cubic centimeters a compression ratio of 9.1:1 and a lubrication system that is a wet sump. 
  • A 42-mm Mikuni BSR42/1 carburetor and an air filtration system that is wet manage the air-fuel mixture. The horsepower of the vehicle is 40.9 horsepower (as of 2010) The maximum speed is 70 mph as of the stock model, and estimates of fuel efficiency are 14 percent (16.8 Liters/100 km).
  • Fuel to use: Use unleaded gasoline that has a pump Octane count of at least 86 and a research Octane value of 91 or greater. To prevent damage to your engine ensure you use an alternative fuel that has at least 10% of ethanol, and less than five percent Methanol.
  • LubricationYamaha Grizzly660’s capacity for oil differs depending on whether or not there is changing the oil filter. When draining, it’s 2 US quarts/1.9 Liters. After disassembly, it’s 2.2 US quarts/2.3 liters and the change of the oil filter capacity of 2.1 US quarts/2 liters. 
  • Use SAE 5Wor 10W-30, 20W-40 Yamalube 4 4-stroke oil, or comparable motor oils for the highest performance. Ensure that it also has an API service classification of at least SJ (manufacturer-recommended API grades of SE/SF/SG are already obsolete) with no anti-friction modifiers.
  • Drivetrain The Ultramatic V-belt shaft drive and an awe-inspiring, centrifugal, wet clutch (L/H/N/R/P) operate with left-hand control and deliver force to the wheel. The sub-transmission ratio for low of 37/15 (2.466) The maximum ratio is 29/19 (1.473). The 10.5-feet turning radius makes for more comfort during the riding.
  • ignition: It uses a DC-CDI ignition that has an electrical start system as well as an auxiliary mechanical recoil backup. It comes with an F4T496/MITSUBISHI AC-magnet generator that powers electronic devices. 
  • This requires a 12V 18 Ah, 300-CCA (Cold Cranking amps) battery with dimensions of 6.88 3.44 x 3.44 6.12 inches. 6.12 inches and a 10 amp fuse.
  • tires: Tubeless, Dunlop KT131 AT25 8-12 front tires, and Dunlop KT135 AT25 10-12 rear tires are mounted on steel rims. The recommended the pressure of the front tire ranges from 32-38kPa (0.32-0.38 kgf/cm2, 5.5 psi) and rear tires are 27-30 kPa (0.27-0.33 kgf/cm2, 4.8 psi). Don’t exceed 3.9 27kPa/psi (0.27 kgf/cm2) and 36 psi/250kPa (2.5 kilograms/cm2) when you place tires.
  • Brakes Two disc brakes that operate right-hand, as well as right-hand and left-hand operated single-disc rear brakes, give a Yamaha Grizzly 660 its stopping power.
  • Suspension An aluminum tube frame is enclosed by double-wishbone independent front and rear suspensions that have preload adjustment, and 170 mm (6.69 inches) and 225mm (8.86 inches) in wheel movement. Shocks for both are of a type of coil spring/oil damper.
  • Dimensions The overall dimensions of HTML0 include 82.1 x 45.3 and 47.6 inches (2,085 1150 1210 millimeters L x W and H). The minimum clearance on the ground of 10.8 inches (275 millimeters) which is the same as the wheelspin measures 50.2 inches (1,275 millimeters). 
  • Its curb weight is 299. kg/639 pounds, which is heavier than those of the Yamaha Raptor 660. Its seat is 34.6 inches. In 2004, the Yamaha Grizzly 660 has a dry weight of 272 kilograms/600 pounds.
  • Capacity: Its fuel capacity is 5.3 US gallons/20 liters with a capacity of 0.92-US gallons/3.5-liter reserve. The capacity of the radiator is 1.90 quarts/1.8 Liters. The final capacity of the gear case oil is 0.32 quarts/0.30 milliliters as well as 0.35 US quarts/0.33 liters for differential gear case oil. 
  • The maximum load limit for the quad is 485 pounds/220 kg (including the rider, cargo, and other accessories).
  • Exterior The exterior features a tube frame made of steel (with an angle of 5deg for casters and a trail of 26 millimeters) and a plastic body material. The four-wheeler is equipped with handgrips along with rear and front footrests, fenders, and bumpers on the front and rear. 
  • Dual headlights with a power of 30W are located in the front of the fenders. A five-watt taillight, as well as a 21-watt brake light, offer superior lighting distribution. The remaining warning indicators on the center console are LED lights.

How Fast Is a Yamaha Grizzly 660?

The top speed for the stock Yamaha Grizzly 660 is 70 mph. The speed may vary depending on temperature, altitude as well as humidity, weight of the rider as well the terrain, changes, and general condition of the vehicle.

Pros and Cons

It’s crucial to look at the advantages and disadvantages of a four-wheeler before you make the purchase decision. Here are a few points to take into consideration:


  • This single carburetor produces tons of power and delivers outstanding performance on roads that are hard to access.
  • It is equipped with one of the top 4WD locker switches on an ATV.
  • Radial tires greatly improve the handling.
  • The overall design that the vehicle has makes it an excellent option for leisurely rides as well as heavy hauling.
  • The high surface clearance is easy for riding on rocky or bumpy terrain.
  • This machine is great for riding all day long due to its comfortable suspension and smooth handling.
  • Riders are unanimous that it is the most effective belt system in its class.
  • Snorkels are higher than the majority of ATVs, making them ideal for deep-water fishing.
  • Power-to-weight is acceptable and makes the Grizzly a sturdy machine.
  • It offers more extensive aftermarket support when compared with its competitors.
  • Larger racks and a more towing capacity make it a quieter utilitarian vehicle.


  • The difficulty of finding the reverse as well as IRS squat decreases the Yamaha Grizzly’s performance as a work vehicle.
  • The park position could be accidentally engaged when trying to shift into the reverse.
  • Obstacles that are off-camber and uneven aren’t part of its strengths.
  • The rear axle appears to pop out every time from the differential at the rear.
  • In the garage for a time can result in the engine not receiving any fuel.
  • The fuel efficiency and mileage are among the lowest among its competitors (only improved from the model year 2014 from then on).
  • Cylinders found on Grizzly aren’t coated with Nikasil (which could mean additional cost for Boggers who mud).
  • Aesthetics may not be the prettiest or most appealing in the marketplace.
  • It’s not recommended for riders who are young because they might not be able to handle the weight and force of the machine.

Other Drawbacks

In addition to the previous problems, here are a couple of other issues that are known to the Grizzly worth mentioning:

    • Poor front driveshaftElongating the holes that mount the differential within the frame as well as moving the differential 1/8 ” farther away from your engine may fix this issue.
    • Excessive burning of oil: This problem links to 2002-2004 models. Several factors could result in the vehicle burning oil in excess. Doing a leak test and compression tests can help you find the right spot to investigate. The accompanying symptoms can also aid. 
    • For example, smoke in cold starts could be a sign that valve stem seals are worn or rings have become damaged. Smoke-free conditions typically suggest an oil leak.
  • The rear differential that is moving is well-known in that it can be able to twist or move within the frame. Thus, checking this area of Grizzly is essential particularly when older models are used. Examining for bent or damaged mounts is also recommended.
  • The problem is that it’s overheated. The most common symptoms are an oily scent, white smoke, and a sluggish start-up. 
  • It could be due to a blowing gasket, or seals or guides to the exhaust valve (if not used for long periods of time such as cases for the snowplow Grizzlies).

Many of these problems are self-inflicted or in the form of circumstantial. As with the rear axle breaking others have been rectified via factory adjustments (as in the year 2003 Yamaha Grizzly 660 onwards). 

Naturally, the flaws will not bother the experienced mechanics and owners since they have proven to receive more than they pay for the worth from an old Grizzly. 

However, for those who desire more, they must keep in mind that regular maintenance and a few tweaks are required to get the most value from this beast.

Yamaha Grizzly

How to Make the Yamaha Grizzly 660 Faster

Most often, the main reason for the endless attempts to customize your Grizzly is the riders’ need to speed. 

Over time experts and mechanics have fitted these bikes with a variety of Yamaha Grizzly 660 parts to boost the top speed of the four-wheeler. Here are some recommended upgrades that will increase the speed of your quad:

  • 27″Vampires” are on C-Series type 4
  • 26 589s and 29.5 Outlaws as well as Kenda K587 Bear Claws (view on Amazon) as an alternative
  • 1.5-inch spacers on the wheel front and 1-inch wheel spacers back
  • Pro Flow K&N filter
  • HMF complete pipe
  • Slip-on exhaust
  • EPI clutch
  • Full aluminum skids
  • PROCOM CDI & Rectifier
  • The AT-Steeler shocks of Works Performance
  • Dyno Q415 Jet Kit (view on Amazon)
  • Machined clutch sheave
  • 14-gram weights made of greaseless
  • 2-mm shim

About Yamaha

Yamaha Motor Company Limited, the top company in sales of water vehicles, is the producer of the Yamaha Grizzly 660. 

The Japanese company was founded as an organist and piano maker in 1887. It wasn’t until after World War II that the firm began producing motorcycles. 

In the end, it split from the parent company in 1955 to form Yamaha Motor Co., Ltd and developed the ATV industry over two decades after. 

The products of this market leader range across motorsports to offroad cars, personal watercraft, speed boats, to outboard motors.

Conclusion – Yamaha Grizzly 660

It is a shame that the Yamaha Grizzly 660 can conveniently be lost in the superlatives of its competition, such as its rivals like the Prairie, Rincon, and Vinson. 

However, it’s still a powerful machine that is at the forefront in its class in the ATV scene. Driving the vehicle can boost confidence and feels almost like being part of the vehicle.

For those who aren’t confident, the Grizzly’s habit of unloading its suspension at mid-corner nerve-racking, particularly when trying to negotiate the switchback. However, its responsive engine, brake system, and CVT transmission will never let you down. 

It has provided many riders with joyful moments as well as difficult situations and will continue to provide them with joy for many futures.

Are Yamaha Grizzly good?

The Yamaha Grizzly 700 is a highly durable and reliable quad. Thanks to its sturdy frame, it can withstand extreme conditions and reckless riding styles. However, it’s not perfect. A lot of owners have encountered problems regarding the Quad.

Is the Yamaha Grizzly 660 Automatic?

California green sticker is compliant. The only industry-exclusive, fully automatic Ultramatic(r) transmission is the most sophisticated ATV driving system. An automatic centrifugal clutch ensures an unbroken belt tension to ensure less wear on the belt, unparalleled endurance, and secure all-wheel downhill engine brakes.

What is the most reliable ATV?


According to consumer polls on ATV.com, Honda is the most trusted ATV brand. The second spot in the polls is Yamaha.

Is the Yamaha Grizzly good for mudding?

If you construct the bike correctly, it’ll be a stable bike. Like the majority of Yamaha’s. Even in mud-ridden conditions. That’s why Yamaha has built a trustworthy name today, even among people who ride in the mud.

Is a Yamaha Grizzly 660 a 4×4?

The Grizzly 4×4 660 comes with an Independent dual wishbone front suspension with 7.1 inches of travel. Meanwhile, an Independent Double Wishbone Rear suspension features 9.5 inches of movement. This Grizzly 660 4×4 has front disc brakes with dual hydraulics, and disc brakes mounted to the rear shaft.

How fast is a Yamaha Grizzly 600?

60 60 mph

The vehicle’s horsepower is 37 hp/27.59 Kilowatts (short by 3.9 horsepower compared to Grizzly 666). The maximum speed is 60 mph in stock. The fuel efficiency estimates are 23 mpg (10.23 100 km/liter).

How much oil does a 660 grizzly hold?

A Yamaha Grizzly 660 is an all-terrain vehicle with a 654-cc liquid-cooled engine. This ATV runs on the standard Yamaha four-stroke oil. It also holds three and three-quarter quarters inside the crankcase. You’ll need just the tools needed to clean the oil and the filter on the fat of this ATV.

How much horsepower does a Yamaha Grizzly have?

50 HP

The horsepower of the vehicle has been set at 50 horsepower (as of the year 2016, an increase of 6% from the 47 horsepower from earlier models), the maximum velocity is 64mph in stock, and the estimated fuel efficiency at 21.44 mpg (10.97 100 km/liter).

What ATV has the least problems?

Honda ATVs are the fastest quads. They have an explosive-proof transmission and are equipped with metal gears. They can withstand challenging terrains, are rugged, and continue to kick even after enduring a lot of abuse. Other reliable brands are Kawasaki, Polaris, Yamaha, Arctic Cat, Argo, SYM, Can-Am, and CFMoto.

How long will an ATV last?

Quads that are well maintained and regularly serviced will last more than ten years with no issues, and many last wells into their 20s. More robust models should offer a minimum of 6-8 years of reliable service before they begin to disappoint you.

Yamaha Grizzly 660 FAQ

1. Is it a Yamaha Grizzly 660 4×4?

Independent double-wishbone front suspension on the Grizzly 660 4×4 is 7.1 inches in travel, while the Independent double-wishbone back suspension has 9.5 inches. The Grizzly 660 4×4 features front dual hydraulic disc brakes, as well as the rear shaft, mounted disc brakes.

2. Is the Yamaha Grizzly reliable?

The Yamaha Grizzly 700 is a sturdy and reliable quad. It can withstand harsh riding styles and extreme conditions thanks to its sturdy frame.

3. Where is the VIN on a Yamaha Grizzly 660?

It will be located on the left-side lower frame. It is approximately 6 inches from the lower a-arm mount.

4. How fast does a Yamaha Grizzly go?

64 mph is the top speed for a stock Yamaha Grizzly 700. Some 2015 Yamaha Grizzly 700 owners have claimed to be able to reach 70 mph.

5. How fast does a grizzly 600 go?

The vehicle’s horsepower is 37 hp/27.59 kW (shortened by 3.9 hp compared with the Grizzly 660). Its top speed at 60 mph is stock. The estimated fuel economy is 23 mpg (10.23 liters/100km).

6. Is the Yamaha Grizzly good for mudding?

Grizzlies are excellent platforms for mud bikes. They are not the full-throttle mud bike with 30-inch mud tires. They will be more suitable for a fine-tuned mud bike. The Grizzly is no exception. It’s hard for any bike to withstand full-throttle mud hole riding.

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