Yoshimura Full Exhaust Fumes

[CIP57_imp]

Folks,

I installed a full Yoshimura system on my bike just as soon as I bought it. I love the exhaust. It sounds great, it looks good, it’s very light, easy to install, and it definitely helps in the power department.

I have it running with the O2 sensor installed.

My dilemma is that the exhaust is quite fumey. I miss the cat. My wife is sucking fumes the entire time she rides with me. I use the bike to commute to work so I don’t want to show up smelling like the track.

Would a tune help? Flash or PCV? I was under the impression most bikes run lean from the factory and a tune would enrichen the mixture. In my mind a richer mixture would make the problem worse. Do I need to eliminate the O2 sensor? Some sort of wind deflection?

Thank for the help guys!

I have the same exhaust with a flash and map. You are correct, not so much the flash but putting a map to correct the lean condition of the bike will increase the fumes. My bike runs at a perfect 13.2 A/F ratio throughout the range. If you do the pair mod to eliminate farting on decel you will get a stronger odor of unspent fuel. Its not a problem for me as a solo rider, i don't smell anything.

When i warm the bike up it smells like a dual exhaust high performance car of the late 60's, i sat behind many of them while working in a gas station in the early 70's.

As far is the O2 sensor i have mine hooked up, I'm sure the ECU reads off the sensor. Someone here with more knowledge will chime in soon regarding weather that would make a difference or not. I don't believe disconnecting the O2 will do anything to reduce or eliminate the unspent gas.