Thanks Stephen. I had thought the same thing, but if the pins were opposed, I thought the servo pulley would still modulate at 2000-3000rpm as normal, but just in the opposite direction. If anyone has a part number for the correct motor, I can cross check, but the wiring is consistent with the loom it plugs into.

I also tried a spare TPS i had lying around today with no joy so it looks like the saga continues.

Also, has anyone heard of bypassing the secondary RC valve controller? I hadn't until I found this... http://88nsr250rsp.web.fc2.com/88rc.html but unfortunately I am unable to convert the web page from Japanese into English.

Thanks again for taking the time to respond guys. I am almost at my wits end.

Cheers,

Andrew