you will find this within the mini/junior classes rather than the seniors. This is because the fully open position isnt the richest. Coming of the throttle a little will make it richer and when goging down a straight, quicker.
Dont know why, hopefully someone will say but..
take off the air box. push the trottle you will see the slider move up and down. on the front of the slider, you will se a brass circle/
On full throttle, you will not see it as it moves up wards but an ideal position may be so you only see half the circle on full throttle. This can be altered with how far the pedal travles.
Is something you may need to play with on a test day
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