I've got all sorts of NSR cars running well on Sport track with magnets in place.
As said earlier, you need to space the guide a fraction to gain a bit of clearance, and I also stiffen the chassis by gluing a 50mm or so long bit of Scaley track rail either side of the chassis, as the magnet tends to pull/flex the chassis toward the track making the motor bottom out as in your photo. Works for me.
As said earlier, you need to space the guide a fraction to gain a bit of clearance, and I also stiffen the chassis by gluing a 50mm or so long bit of Scaley track rail either side of the chassis, as the magnet tends to pull/flex the chassis toward the track making the motor bottom out as in your photo. Works for me.