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Tier Ratings
The engine tier depends on the model year and horsepower
rating of the engine. You will need the engine manufacturer, model
year, and family name to determine the tier rating for the engine.
Off-Road certification
database and Executive Orders (EO).
As of January 1, 2011,
engine manufacturers are required to produce engines certified to the
following levels:
Engines rated 50 to 74 bhp:
Interim Tier 4.
Engines rated 75 to 174 bhp:
Tier 3.
Engines rated 175 bhp and
over: Interim Tier 4.
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