Thanks! Yes the motor is original and it runs quite good. Also the old transistor ESC is actually nice to drive, vintage but cool. I don’t now how well a stronger motor is taken by the transmission. Even if it is now equipped with ball bearings, it seams to be fragile and sensitive to torque.
Also a weak point are the knuckles, it is certainly good to have one spare. The knuckles from the old Bruiser / Mountaineer fit also and are improved in stability.
The only bad thing is suspension, for a runner it is worth to replace the leaf springs with softer ones, and add the damper with the most hard oil.