Hi guys,
Thanks for all your help, I really appreciate it.
So I've changed the belt finally, took me a while not having done it before, but its done
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With regards to what caused the problem I went through all your advice, one reply at a time and I learned tons about the car in the process.
It turns out though that if I wanted to fix the cause of the belt flip, I should have looked at the last post first.
A couple of weeks ago, the pinion gear came loose at the track. While trying to get it on again I lost the original set screw for the pinion gear.
I really did not want to go home at that time, so I searched through my pit box in search of a replacement set screw.
I finally wound up unscrewing one from a Robinson pinion gear I had lying around.
As it turns out that particular set screw was about 2mm longer than the original one, but it fit into the hole.
I didn't even consider the fact that the protruding screw could cause a problem, so I screwed it in at kept on racing...
A few weeks later the belt flipping problem started and the belt teeth also seemed to have been worn down in a funny way.
It was like a line had been cut down the middle through the entire length of belt and the teeth were worn down on the "inside" towards the motor side.
D'oh!!!! (Courtesy of Mr. Simpson, Springfield, America)
Long story short, I have now changed the set screw to a shorter version, so hopefully now with a totally refurbished car, belt flipping will be a thing of the past...
Once again thanks to all the people who replied to this thread, this is why the internet rules
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