Changing to Dual motors E-scooter loses power

Hi,
I have a problem where my scooter comes almost to a stand still about 10 to 20 secs after changing from single drive to dual mode. The power seems intermittant making the wheel movement jerky or jittery. Testing each wheel and controller in single mode, each work as normal. If i power off the scooter then turn it back on everything is fine until i change to dual mode, again the motors misbehave after anywhere from 10 to 20secs. The controllers are 48v 25A and wheels are 48v 1000w.

A problem that’s reared its ugly head recently?

One that’s developed progressively over time, becoming more frequent?

You bought a used scooter with the problem already apparent?

Or you pieced together this system yourself?

Are you using the original battery and controllers?

Does the same occur with the scooter propped up on a bench, chair, or stand without wheels touching the ground?

Do you know the BMS specifications?

Are you able to measure current draw?

It is a secondhand scooter but i am friends with the previous owner so am aware of its history to a small degree. For all intents and purposes the problem appeared over night but could have happened anytime in the last 3months as it hasnt been ridden much and when it has, not often in dual wheel mode

Additional info.
I have tested with different wheels and problem still exists, essentially eliminating the motors.
Im not 100% but the original battery and controllers are still being used
The problem still exist with scooter on a stand and both wheels in the air.
I have a multimeter and can use it in a hobbiest/intermediate capacity. Point me in the right direction and i should be good to go.
It is an Aikez 1000w dual wheel e-scooter

Best guess is your battery pack is old and tired. It's sagging under the increased load and then the BMS steps in. Try to monitor the pack voltage while you ride.

A minimum of 48v 30ah or 52v 15ah (*50A continuous*) lithium pack is required to operate your new setup.

A single motor under full load draws far more current than two motors unloaded, so there’s nothing to suggest battery issues.

There’s interference with the controllers. Could be a wiring fault, so you’ll want to inspect the wiring thoroughly, but I suspect the cause will be in the control system.

I happen to have one those scooters at the moment, but not in working order. (Needs new controllers, better battery, road tires, and I’m trying to convince the customer to start over with a different platform).

The two controllers are asymmetrical, one with additional wires, but they are linked, and it’s non-obvious how the system works. Probably not as complex as a master and slave arrangement, but is more troublesome to troubleshoot than two independent controllers. I’ve done no research or real testing it on it, since I’m trying to talk the customer out of repairing it.

Since each of your controllers work happily in isolation from each other, it’s likely the problem is in the display/throttle unit. I presume yours is NJAX-T?

And the controllets are Nanjing Aoxiong Electronics?