Well it's probably restricted so the little ones don't go too crazy on it.
It should respond to the standard derestrictions (IE Wedding ring on Variator, headed blockage,
upjet) but at 4000' you should be running rich (as there is less air) so I wouldn't start hacking
the airbox right off.
Here's some info I found somewhere on derestricting the 50cc scooters, it might work on your ATV!
"
CVT DE-RESTRICTION INSTRUCTIONS FOR KYMCO 49CC SCOOTERS
All KYMCO scooters powered by 49cc engines are restricted in order to meet the
state and local laws for moped classification. These restrictions can be removed,
but may change the registration requirements on the scooter. Each dealer must
check their respective state and local laws to determine how the vehicle can be
registered and operated in their local market.
Follow these step-by-step instructions to de-restrict the automatic continuously
variable transmission (CVT) on these models.
1. REMOVE 8 OR 9 BOLTS (8MM) FROM CLUTCH COVER. ON SOME
MODELS IT MAY BE NECESSARY TO LOOSEN BODY PLASTICS TO GAIN
ACCESS TO BOLTS.
2. REMOVE 17MM NUT FROM FRONT PULLEY.
3. REMOVE OUTER HALF OF PULLEY (DRIVE PULLEY FACE).
4. REMOVE DRIVE BELT FROM SHAFT.
5. WITH YOUR LEFT HAND, HOLD INNER HALF OF PULLEY (MOVABLE
DRIVE FACE), AND WITH YOUR RIGHT HAND REMOVE BOSS FACE DRIVE
(VARIATOR SPACER) CAUTION: HOLD INNER PULLEY HALF SECURELY TO
INSURE CLUTCH ROLLER WEIGHTS REMAIN IN PROPER POSISTION.
6. INSERT NEW SPACER.
7. INSTALL BELT.
8. INSTALL OUTER PULLEY HALF AND 17MM NUT.
9. INSTALL COVER.
CAPACITOR DISCHARGE IGNITION DERESRICTIONS
FILLY:
NO DERESRICTIONS.
ZX 50:
1. REMOVE CDI FROM BIKE.
2. 2. LOCATE LIGHT GREEN AND DARK GREEN WIRES.
3. 3. CUT LIGHT GREEN WIRE NEAR COUPLING.
4. 4. SPLICE LIGHT GREEN WIRE INTO DARK GREEN WIRE.
5. 5. REPLACE CDI.
COBRA RACER, COBRA CROSS, SUPER 9,AND YUP:
AFTER LOCATING THE CDI, YOU WILL SEE A GREEN WIRE THAT
COMES FROM AND THEN LOOPS BACK INTO THE UNIT.UNPLUG
THIS WIRE AND THEN REPLACE CDI UNIT.
PEOPLE 50:
ON 2000,2001,ANDEARLY 2002 MODELS, THE CDI HAS TO BE
REPLACED WITH A COBRA UNIT.THEN FOLLOW THE COBRA
INSTRUCTIONS.ON LATE 2002 ANDALL 2003 MODELS JUST UNPLUG
THE GREEN WIRE.
CDI LOCATIONS
FILLY:
UNDER THE SEAT BUCKET ON THE RIGHT SIDE OF FRAME.
ZX 50:
UNDER THE SEAT BUCKET ON THE RIGHT SIDE OF FRAME.
----------------------- Page 3-----------------------
COBRA MODELS:
IN THE BATTERY COMPARTMENT, WHICH IS LOCATED UNDER THE
FLOOR PANEL.
SUPER 9:
REMOVE STORAGE COMPARTMENT LID.REMOVE TWO SCREWS
FROM BOTTOM OF STORAGE COMPARTMENT.REMOVE STORAGE
COMPARTMENT.YOU WILL NOW SEE THE BATTERY.THE CDI IS
LOCATED IN FRONT OF THE BATTERY.
YUP:
UNDER THE SEAT BUCKET ON THE LEFT SIDE OF THE FRAME.
PEOPLE 50:
UNDER THE FRONT COWLING.TO REMOVE COWLING,
REMOVE THREE SCREWS, TWO IN BACK AND ONE IN FRONT,
AND LIFT UPWARDS ON COWLING
Call KYMCO USA technical department at 1-800-845-7007 Ext. 231 for any
questions regarding de-restriction instructions. "
I would imagine you want to break it in like other motors by accelerating then decelerating a bit
during the first 100 miles or so...
