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Did you or shop reset the computer after changing parts? Kinda simple. Look here for a lot of good information on these and other engines. https://chinariders.net/showthread.php?t=15675 Look at post #5 "Rebooting the ECU Perform the following steps to reboot the ECU. 1. Turn off the ignition for 15 seconds. 2. Turn the ignition on/off for 5 cycles. Make sure each cycle lasts about ½ second, verifying the start of the fuel pump for each cycle. If the fuel pump doesn't start during any cycle, begin the entire reboot procedure from the beginning. 3. Turn off the ignition for 15 seconds. __________________ Spud" The Motorcycle Doctor has another procedure for resetting the ECU but I think the above procedure is safer.

Try disconnecting the gear position switch on the transmission. Mine was messing up and thought it was in low. Don't really need it unless you like the BEEP!

Sounds like an adjustment issue to me. I don't know if it's a cable or levers that control the transmission, but definitely something is out of adjustment.