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If the O2 sensor is disconnected when trying the other exhaust wouldn't that potentially cause problems with fuel mixture, especially cold when the 'choke' would be applied.
Airhead-
According to the garage above the o2 sensor does nothing, so honda were just fitting them for fun.
I haven't said but it did run with it disconnected and then just cut out and wouldnt restart again. I dont know why yoshi didnt have a fitting on the pipe out the factory tbh. Its a royal pain in the arse
konastab01
My standard zoomer (Polini varitor) is my only upgrade. I’ve got a carbon Yoshimura pipe for it and had the o2 blanking plug for but the bike ran like shit when I fitted it. I was going to get a plug fitted to the yoshi pipe so I could use the o2 sensor on it but a local shop says they can map it out apparently.
Last week I couldn’t get it to start with the yoshi pipe fitted when it was booked into the shop to get mapped out (They then said they could get it to start) but I took it away and as soon as I put the stock pipe back on it runs again.
Anyone got an idea why it’s doing that with other pipe fitted