Hello!

I`am trying to change my original exhaust to fmf q4 exhaust. But now i am thinking what i have to do this hoses/cables when i put my new fmf q4 exhaust?

E: My bike is yamaha wr250x :P







Just i remove all or what are you doing...?

The EXUP valve and cables can be safely removed, but leave the EXUP servo (or get a servo sub) so you don't throw any codes. As for the O2 sensor, our bikes in the USA don't have them. You really need to keep that, so you will have to have a bung welded into the Q4 to accept the O2 sensor.

O2 sensor!? wow I had to pay good $ to get that capability via DynoJet autotune hardware.

EXUP servo is on the other side of the bike, you will see it under battery if you remove left side cover. Take plastic cover off, and you should be able to remove two exup control cables from the servo. (Unhook exup valve first)

Nex said:

If you bought your bike in Finland like he did, you would get the O2 for free from the factory. It comes stock on the Euro models.

So Euro has closed loop FI system? Is it any good, i.e. does it map itself?

mwakey said:

I have the Euro version of the WRR and installed Q4 plus header and simply disconnected the O2 sensor. Makes zero difference. Just tape the loose cables up and stick em under the seat. Does not change performance in any way and also does not light up any codes.