They put those on so little kids don't hold it wide open till it does damage! The way mine worked was that if once it got to a certain rpm it would just start cutting out. Like how auto's are made now with rev limiters etc.
I had a baja 90 and under the back left rear fender the rev limiter was located. It was even adustable on mine. Also If you unplugged it , quad would still run... but with no rev limiter. Some models I think it was built into the ignition module and you couldn't play with it.
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2008 Yamaha Kodiac 350
2007 Jetmoto 150
2005 Honda 250ex
2005 Ducar 110
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