About the Study Guide

You are looking at a preview of what’s in the timed Idaho Offroad Ed Course. Feel free to look around, but you’ll need to register to begin progress toward getting your Idaho OHV Safety Education Certificate.

Learn More Register for the Course

Muffler and Spark Arrestor

A muffler with a USDA Forest Service–approved spark arrestor is required on all OHVs. The muffler must prevent engine noise in excess of 96dB when tested at the half-meter test according to the SAE J1287 sound-testing procedure.


Make sure your brakes can control and stop your OHV.