‘97-‘98 Ski-Doo MXZ 670 Specs and Review [Video]


The Ski-Doo MXZ 670 was a high-performance trail snowmobile marketed in the late ‘90s. It was powered by a 2-stroke, 669cc ROTAX twin rated at 118 horsepower. This lively Ski-Doo twin was the predecessor of the more powerful MXZ 670 HO, as well as the MXZ 700 and MXZ 800.

If you want to find out more about this classic 2-stroke sled, this post is for you.

We at PowerSportsGuide have compiled all you need to know into this Ski-Doo MXZ 670 review!

Ski-Doo MXZ 670 Review

Ski-Doo released the MXZ 670 in 1996 as a limited edition model which went into full production the following model year. The closest competitor of this sled was the Yamaha Vmax 600 XT, so choosing between the two was not an easy decision!

The official name of this Ski-Doo was MX Z 670, but it was commonly known as MXZ 670. (Because of this we’ll also stick with this name.)

This model inherited its S-2000 chassis from its MXZ predecessors, but was powered by a more powerful, 670cc twin engine.

This power source debuted in the 1993 Mach 1 670 but to the greatest regret of many trail riders, it found its way into the MXZ chassis. In 2000, it was phased out by the more advanced 698cc Rotax engine.

In terms of specifications, the MXZ 670 engine was a liquid-cooled, 2-stroke, 669cc, rotary-valve, “ROTAX 670” twin that delivered 118hp on the dyno.

This high-performance power mill enjoyed many advanced technologies, including:

  • Rotax Adjustable Variable Exhaust (RAVE) valves
  • Liquid-cooling system
  • Dual 40mm Mikuni caruretors
  • NGK BR9ES spark plugs,
  • Cushion drive T.R.A.C. clutch
  • “Two-in-one” tuned exhaust pipe with spiral muffler

Thanks to its advanced features, the Rotax 670 generated great mid-range and peak power along with a lot of torque. On top of that, it built its reputation on excellent reliability and durability.

Ski-Doo built every MXZ on the S-2000 chassis from 1996 through 1999 and the MXZ 670 was no exception.

Regarding dimensions, the sled was 107.3 inches long, 44.1 inches high, while its ski stance was 41 inches.

Its dry weight was only 502 pounds, which ensured a great power-to-weight ratio.

On the front, you could find a DSA trailing arm front suspension system inherited from the MXZX 440 snowcross machine that offered a remarkable travel of 7 inches.

On the rear, the 121” track was mounted on a Ski-Doo exclusive SC-10 Cross-Country suspension, which had a travel of up to 10 inches.

According to SnoWest.com, the standard features of the MXZ 670 included:

  • 95 US oz. oil tank
  • 10.7 U.S. gallon fuel tank
  • Front shock absorber kit (HPG)
  • Acceleration and Control Modulator (ACM)
  • Straight handlebars
  • Carbide runners
  • Heated grips and throttle lever
  • Well countered seat
  • Side padding
  • Bremo disk brake
  • Hi-beam indicator
  • Injection oil level indicator
  • Mechanical fuel gauge

The top speed of the MXZ 670 was roughly 100-110 mph on the radar (or 110-120mph on the speedo) depending on environmental conditions.

Besides its remarkable top speed, it also offered arm-stretching accelerations of between 50-90mph.

Despite its great performance, the MXZ 670 never became as popular as its successors like the MXZ 700 and MXZ 800.

Ski-Doo MXZ 670 Problems

Even though the MXZ 670 was one of the most reliable classic Ski-Doos, it had some minor design flaws, including:

  • Head gasket issues:  For example, some of the ’98 models had problems with the head gasket, but aside from this the engine of the 670 was bulletproof. (Unfortunately, the ’99 MXZ 670 HO was much less reliable.)
  • Suspension issues: Another problem of the MXZ 670 was the poor performance of the SC-10 rear suspension; with a light load the rear arm was prone to “kicking back.” This issue was fixed with the introduction of the second-generation SC-10 II suspension, which debuted for the Millennium.
  • Lack of reverse and electric start: Unfortunately, the MXZ 670 was designed without a reverse and electric start.

Ski-Doo MXZ 670 Specs Chart

For your convenience, we’ve listed the key specifications of the 1997 Ski-Doo MXZ 670  in these charts.

(Note that this sled was manufactured for three seasons, and the specifications may be different in the other model years.)

Ski-Doo MXZ 670 Dimensions and Weight

Dimensions1997 Ski-Doo MXZ 670
Overall Length107.3 in
Overall Height44.1 in
Ski Stance41 in
Dry Weight502 lb

Ski-Doo MXZ 670 Engine Specs

Engine Specs1997 Ski-Doo MXZ 670
Engine typeLiquid-cooled, 2-stroke, w/ Rotary valve
Cylinder Arrangement2-cylinder
Engine stroke2
Cooling systemLiquid-cooled
Maximum power engine speed7700 RPM
Displacement669cc
Spark Plug TypeNGK BR9ES
Spark Plug Gap0.45mm (.018 in)
CarburetorMikuni 40mm carbs x 2
TurbochargedNo
Throttle OperationHandle lever, right-hand operated

Ski-Doo MXZ 670 Liquids

Liquids1997 Ski-Doo MXZ 670
Fuel Tank Capacity10.7 US gal
Recommended FuelRegular unleaded gasoline (with less than 10% of ethanol). Octane number (R + M)/2 of 87 or higher
Oil Tank Capacity95 US oz
Recommended OilBOMBARDIER SNOWMOBILE INJECTION OIL (P/N 496 0133 00 – 1 liter)
Chaincase Oil Capacity8.5 US oz
Caincase Oil TypeBombardier Chaincase Oil (P/N 413 8019 00 -250 mL)
Cooling System Capacity160 US oz
Coolant TypeEthylene-glycol antifreeze for aluminum engines mixed with water (3 parts of antifreeze for 2 parts of water)
Brake System FluidDOT 4

Ski-Doo MXZ 670 Track

Track Features1997 Ski-Doo MXZ 670
Length on ground121.0 in
Width15.0 in
Pitch2.52
Track tension45-50mm (1-3/4 – 2 in)
Track AlignmentEqual distance between edges of track guides and slider shoes.

*Measure gap between slider shoe and bottom inside of track when exerting a downward pull of 7.3 kg (16 lbf) to the track.

Ski-Doo MXZ 670 Transmission

Transmission1997 Ski-Doo MXZ 670
Primary reduction systemBelt
Belt Number414 9182 00
New belt width35.2 mm (1-3/8 in)
Wear limit width32.5 mm (1-9/32)
TypeAutomatic centrifugal engagement, infinitely variable
DriveChain enclosed in oil bath

These charts are for informational purposes only! For exact specifications, please refer to the factory manual.

Ski-Doo MXZ 670 For Sale

Interestingly, you can still find many MXZ 670s on the used market.

If you are considering buying one, you may want to visit Ski-Doo snowmobile forums and social media groups.

Also, you may find a lot of used Ski-Doo MXZ 670s for sale on Craigslist, eBay, or snowmobile classified sites.

If you are considering other brands as well, you can’t go wrong with a Yamaha VMAX 600.

Takeaway – FAQs About the Ski-Doo MXZ 670

What year did the Ski-Doo MXZ 670 come out?

Bombardier launched the Ski-Doo MXZ 670 for the 1997 model year.

What years was the Ski-Doo MXZ 670 made?

The Ski-Doo MXZ 670 was marketed from 1997 to 1998 and phased out by the 670 HO in 1999.

What size was a Ski-Doo MXZ 670?

The Ski-Doo MXZ 670 measured 107.3 inches in length, and 44.1 inches in height, and its ski stance was 41 inches.

What was the track size of the Ski-Doo MXZ 670?

The track of the Ski-Doo MXZ 670 was 15 inches wide and 121 inches long.

How much did a Ski-Doo MXZ 670 weigh?

The dry weight of the (1997) Ski-Doo MXZ 670 was 502 pounds.

What kind of engine was in a Ski-Doo MXZ 670?

The power source of the MXZ 670 was a liquid-cooled, 2-stroke, 669cc, rotary valve Rotax 670 engine.

How much horsepower did a Ski-Doo MXZ 670 have?

The Ski-Doo MXZ 670 produced 118 hp on the dyno.

How fast did a Ski-Doo MXZ 670 go?

The top speed of the Ski-Doo MXZ 670 was 110-120 mph on the speedo or 100-110 mph on GPS/radar.

Was the Ski-Doo MXZ 670 a 2-stroke?

The Ski-Doo MXZ 670 was powered by a 2-stroke engine.

Did the Ski-Doo MXZ 670 Have a Reverse or Electric Start?       

The MXZ 670 came without electric start and reverse systems.

How Much Oil Did a Ski-Doo MXZ 670 Hold?

The MXZ 670 enjoyed an oil injection system featuring a 95-oz oil reservoir.

How Much Fuel Did a Ski-Doo MXZ 670 Hold?

The fuel capacity of the MXZ 670 was 10.7 US gallons.

How Much Does a Ski-Doo MXZ 670 Cost?

The asking price of a used Ski-Doo MXZ 670 averages between $1,000 and $3,000 depending on the year and condition. (Fun fact: the MSRP of the ski was $6,999 in 1997.)

References:

SnoWest

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