As a result of regulations and pro-active actions, snowmobile manufacturers
are introducing cleaner, quieter, four-stroke snowmobiles to the marketplace.
Selling, purchasing and/or renting these snowmobiles, creates a market for cleaner
machines and is the most important action that can be taken to reduce the impact
of snowmobiles on the environment. EPA estimates that over the life of the snowmobile,
the savings in fuel and lubrication oil will be greater than the initial increased
cost of a four-stroke engine. All four major manufacturers make four-stroke
Arctic Cat's 4-stroke "touring" and four-stroke snowmobiles were
available for model years 2002, 2003, and 2004, including a turbo-charged
version. The non-turbocharged models were certified by NPS as meeting their
“best available technology” standards for cleaner, quieter, snowmobiles,
cleaner then the EPA 2012 regulations.
Polaris Industries 4-stroke snowmobiles are available for model years 2002,
2003, and 2004. The models were certified by NPS as meeting their “best
available technology” standards for cleaner, quieter, snowmobiles, cleaner
than the EPA 2012 regulations.
Bombardier and Yamaha both make four stroke snowmobiles. The Bombardier
four-stroke snowmobiles were cleaner than the NPS “best available technology”
standards, cleaner then the EPA 2012 regulations.
Here is what snowmobile dealers, tour operators, fleet managers,
and snowmobilers can do TODAY to reduce the pollution from snowmobile
fleets and personal snowmobiles:
Adjust the snowmobiles for local conditions and altitudes, including:
Use the proper jet size for the elevation. Carburetor jets
with smaller orifices should be used at higher elevations. Use of
the smaller jets results in more complete fuel combustion.
Adjust Clutches. Installation of proper jets for higher
elevation also improves engine performance, and snowmobile clutches
should be adjusted to match performance.
Keep the engine tuned properly.
Use oxygenated fuels, such as 10 percent ethanol blend, in the snowmobile
to reduce emissions.
Use synthetic low-particulate lube oils to reduce particulates and
Use low emission lube oils to reduce potential impacts to health and the
The SAE Clean Snowmobile Challenge is a student design competition
formed to encourage the development of cleaner and quieter snowmobile
technology while simultaneously providing a hands-on educational experience
to college students (www.sae.org/students/snow.htm).
The fifth annual Clean Snowmobile Challenge was held in Houghton,
Michigan in March 2004. Positive results of the Challenge include
using data collected to develop final regulations and employment in the
industry for engineering students to use their expert knowledge in reducing
emissions from all types of recreational vehicles.