TrikyTrev

I bought a 2004 (54 plate) Yamaha Dt125X (the supermoto one) and I am wanting to fully derestrict it. I have had a full DEP exhaust fitted to it, which has made a difference. I have been looking on the net, especially www.dtr125.net and it says to cut the green and black wire that goes into the speedo. I when through the wires and found the 4 pin connecting block (the 1 with 4 wires going in and only 3 coming out) and cut and earthed the Green and brown wire to the frame, I did the green and brown wire as there was no green and black wire. Firstly I did the end that comes from the loom which made no difference so then I tried the other end (Speedo end of the wire I cut) which just seemed to put on the red engine temp light, still which no gains in speed so I just reconnected the two ends and left it for now. Am I just an idiot and got the wrong wire or does this mod not actually do anything??? Please, any help on which wire/wires it is would be a massive help. Regards Triky