Hi Shaun,
I had the same problem with an older sanwa exzes transmitter and found the the potentiometer (electronic component with 3 wires connected to it) inside on the throttle had worked loose.
To reset it, you need set all trims to center and end point settings to 100%.
Once thats done, move the pot to the point where you just lose full throttle at full forwards movement on the stick and then move back a tiny amount to gain full throttle again and lock it into place at that point.
When that is done, recalibrate your speedo and it should give you a full linear feel again.
Hope this helps,
Tony
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