Yesterday I b ought my 11 year old a new eton viper 90 quad. Great machine but rev limiter kicks in way too early. Only doea about 8 mph max. Ive read that newer than 05 machines have an adjustable cdi screw for the limiter but I cannot find it. What I assume is the cdi is located right under the front fairing and it is mounted to a little metal tab by a rubber sleeve. I have no idea how to adjust the limiter but I nees to. Cam anyone help? Again it is a new eton viper 90.