Hi all,

I have a 2007 Yamaha XT660R with twin Wrex exhaust Cans on. The bike sounds amazing with these fitted, although they are making the bike run too rich on fuel. I have been experiencing a lot of popping on the roll off sound and I need to find a way of making the fuel/air mixture leaner.

I have been advised by a dealer that the bike needs to have a power commander in order to temper with the ECU, but appears to be very expensive

Can anyone help?