Cutting out

I have a 2023 Zhongneng ZN50 QT 11B which has been derestricted by remapping the ECU.However at about 38 mph it cuts out and I have to back off the throttle for it to pick up again.The dealer told me this is the way my bike is can anything be done about this

 

Check spark plug colour, it should be a nice chocolate brown, if it's a bit grey put a slightly bigger main jet in carb. How has it been derestricted ?

 

The dealer remmaped the ECU once it was run in but he is saying that nothing can be done but I would like to get it sorted

 

I've never heard of a ecu being re mapped on a chinese 50cc, ask how it's done.

 

I will do I'll phone them tomorrow thank for your help I'll let you know

 

All I know is that is fuel injection and apparently they use an ecu and on this bike it is the ECU that is restricted and has to be remmaped.

 

ECU is a rev rpm limiter, was there a spacer on the front pulley ? EFI models are very restricted and it maybe all the speed it will ever do ?

 

I don't mind it only doing 36 to 37 mph if it stayed there but when it cuts out then back in after a couple of seconds doesn't seem right but I can't find out what to do to fix it

 

It could be running weak at high rpm ?