Quote:
Originally Posted by prestondrnek
well this system is on alot of new bikes that are still carbureted, vacuum from the carb is used to power that "mistery" device you guys are speaking of, it gulps in tiny bits of air and injects it into the head near the exhaust port.
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Are you thinking of an Exhaust Gas Recirculation valve ?? High vacuum at idle would hold the valve closed and it would open up with less vacuum and more RPM to help burn off unburnt gases from the cylinder. This was a bandage solution on 70's cars and most folks pulled the vacuum line off and plugged it with a golf T.