Yes, I've replaced everything short of a new motor.
Next test will be to take off the front and rear drive shafts and run the motor to try and hear what the clutch is doing without load.
The clutch shoes are brand new and come with the spring already around them. All you do is separate them slightly and slip them over the pilot shaft.
Is there a better clutch shoe set-up for this Mini Inferno 09?
May be coming ever closer to a shelf queen or a donation to a fellow racer of these. Somebody has already put in his 1st dibbs for the donation, sorry.
Will try and post up with the final solution, good or bad.