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Scooters - 50cc => Super 8 => Topic started by: complex on March 28, 2013, 03:28:29 AM
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This is on a 2012 Super 8 50 T. I removed the restrictive rubber hose from within the air-box, opened surrounding air intake on the plastic filter cover panel and now it won’t throttle past mid-range without hand choking the air flow. If physically choked (minimally) the motor screams to high end. The stock Main is a #70. Does anyone have any first-hand experience with jetting on this year/model/carb before I start experimenting?
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DO NOT WIDEN THE FACTORY AIR BOX INTAKE. With it open, the motor would die after 3/4 throttle. Increasing the Main from a #70 Jet to a #85 didn't help. I left the #85 main jet, restored the opening to original (with runner tube in place, and it runs fine. Will do 34 MPH on a flat road. I will leave it like this for now.
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As you have found the intake is tuned as is the exhaust. This chart shows you the length
that the intake must be (to the first restriction) to tune to different RPM's;
(http://members.modernvespa.net/modnrod/uploads/intake_tuning_lengths_chart_477.jpg)
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By removing parts of the air box, it's possible that you have increased air flow into your engine. Fine if you have fitted a sports exhaust, if not though, your mixture will be cocked up now. Probably lean. The fact that it don't rev as much, figures.
Have you experienced any speed gain or loss since your modification ?