My 9053 violation heli has RPM surges at all throttel settings. What is problem and what parts are required to repair?

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Lift is a function of the aerofoil. See that heptr blades are not bent or you or someone else have not tried to straighten the blades. They are at a specific angle to provide the required lift.

I'd check exhaust backpressure to see if you have a clogged catalytic converter

Hi Fuel pump pressure test and Flow test (a wine bottle (75cl) should fill in less than 30 seconds).
ECU could be in limp home, my advice ask a technician for his help. Kind regards David

Have the same problem with my S107 heli. I determined it's in the speed control hooked to the gyro control. This control feature helps keep heli
from turning in flight caused from tork. The lower blades are the ones
that speed up slow down to keep heli orientated. I'm replacing the control board.

The receiver is not binding to the transmitter. Make sure the batteries are in good shape in transmitter. I'm assuming it's a 2.4GHz radio frequency.
When you are about to fly, turn transmitter on first after 4-5 seconds turn
heli on or plug battery in on heli. In the manual there should be a page describing radio binding. It will describe on what gimbles to move and
in certain sequences to complete the process. When the light on transmitter stops flashing means the binding process is complete.
Hope this helps.

it might be the controller that is broken. but it might be if he crashed it too much it could be broken. i had the same problem with my heli but i crashed it a couple times and now it does the same as yours hopefully im some help for u

I own this heli also. The problem is that the tail rotor does not apply enough push to tilt the heli forward. It is this forward pitch that moves the heli forward. Aside form buying a stronger tail motor, upgrading your battery etc, the only thing you can do id this:

Get a credit card, a pair of scissors and some tape. Cut a couple of strips from the credit card about 2 1/2 - 3 times wider thhan the tail rotor blades and the same length. Now tape the strips to the top of the tail rotor blades. Make sure you don't increase the length.

This will help a little by providing more air push when the tail rotor in engaged. Without some serious modding, this heli will never be great.

I have more fun flying my micro size syma helicopter in the garage then I have flying my volitation. If there is even the slightest breeze, the volitation will float in the direction of the breeze and will not fly against it.

if the blades are turning and it wont rise check the top blade turn with you hand and hold the lower gear if it spins its loose the clue inside dont hold the turn blades.
solution: get a small drill bit not to big and a drill at the middle of the shaft by the black part make a hole down to the metal shaft and a littel bit into the shaft know get a small screw that woul fir the hold you just made and in to the shaft and it will hold and wala its fixed

all depends on your load and speed, at full throttel
from rest, should be about 3800-4000rpm, how ever if the kick down cable is not set correctly you may find gears taking long to up shift or kick down coming in to soon.