Problems - Orion Vortex 10.5

[JonB]

Im running an Orion Vortex 10.5 with a LRP Sphere TC Spec Speedo in my touring car and am having a few problems.

The first week I ran the motor it was great - performed flawlessly. The next week I put the car down on the line and it didnt move - the speedo was suggesting a jammed motor (however it wasn't jammed). I had to install a brushed motor for the evening which worked fine with the speedo.

I stripped down the Vortex as far as possible and rebuilt it - I put the car down for practice the following week and it was absolutely fine (problem solved I thought ). Put the car down for the first heat and you guessed it, the car didn't move - the same fault showing on the speedo.

Have I just got a duff motor or could anyone suggest something I may be missing or should try? For information I have tried another brushless motor and an alternative sensor wire and everything is OK.

Cheers