Peugeot SV 50 1993 Pulls great up to 40 then closes

Hello! And I have a little problem with my Peugeot sv 50, the scooter jumps great and also attracts great! from 0 – 40 it goes great, but then nothing goes on, that’s funny.. have a peugeot there is such a new racing cdi in it! have the times out and that has 5 pole, but the plug from the scooter has only 4 cables, so they can’t work properly, or do I get this wrong now? but find in the internet also only 5 pole cdis.. hm, As info: Air filter is clean and carburettor also maybe knows who the problem is!