Help with race bike

[Shabba57]

First post and a desperate one!

Hi just building gen 3 bike for racing.

Had to join up 2nd gen wiring loom after original hacked to death after street fighter attempt on bike.

Problem is engine fires up fine accelerates to 6000rpm and just splutters and won't rev out.

Carbs stripped checked , fuel pump ok.

Have checked ignition module and instead of 12 wires it has 13!  colour is orange/blue line any ideas what it's for please.

Race coming up so desperate to get ready.

Thanks Steve

[Shabba57]

All sorted turns out 13th orange and blue in cdi is jap spec and is a speed sensor. If disconnected it won't rev out. Just need to put resistor in to a power source to trick cdi.