PH,
Thank you.
Yes there is a Boost under there.
Once I've finished a decent set of panels I'll take some detailed photos.
Thank you for the suggestion regarding the motor.
I went out today and bought a 70T which has done exactly what you said.
The Jeep now travels a lot more slowly.
At least with the original 20T fitted I got to test how robust the KNex frame and foam card panels are!
Once again thank you for the tip/solution,
Bern