sp motor
 

My SP v3.0 7.5t motor needs a push start to get going? I know it's not the speedo because I have tried it with a 5.5 and it works. Sometimes it goes sometimes you need to push it. Does anyone know what to do?

Sensor board or sensor wire. When my board failed it would move on it's own, but had very little torque at low speed. Is the 5.5 a SP as well? If it is you could swap the board over to be sure?

I sold it. How much are they, I also noticed that sometimes i had full power sometimes I had half.

I think they are around £30, you may be better off sending back to Schumacher to get them to diagnose properly. if beyond repair they may discount a replacement for you. That was the option i took.