The 9T at 4300KV and unsensored may have been part of your problem with little grip considering it was cold & damp, the wheels are spinning up to fast.
Hobbyking do a 13t unsensored (which should be allowed) for as little as £14.00 I have one in my car with a 60A and its fine. Your boy will be fine running his standard motor.
We have to start somewhere with rules and the 13.5T rule is so its a level playing field for everyone. After speaking with all the TC clubs in the area the 13.5T motor is what most people are running as are the BTCC, BRCA and SICC so thats why we took that on as the "club" motor spec. If everyone is running the same spec motor we will have one class which will make it all more competative for everyone.
Hope this helps.
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