Many of today’s sport quads have the crankcase breather tube running up into the airbox. In extreme racing situations, the breather tube can blow crankcase oil all over the air filter. To remedy this, many race mechanics run a longer tube up past the airbox and toward the back of the ATV by the grab bar. A tiny aftermarket filter is used to keep dirt from coming in as well as to keep the majority of the oil from coming out.

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