Bung size on Yoshi R77?

[Forrest20 0]

Does anyone know if the bung on the yoshi R77 is wide-band? 

[mossrider 3,050]

The stock O2 sensor threads in. (Whatever size that is)

[blackout 1,136]

For what it's worth, narrow band is 12mm, wide band is 18mm.

[Forrest20 0]

@blackout thanks, I currently have the R77 on my bike with the stock O2 sensor in it. However, I was wondering what size bung it is because I’m getting my bike dyno’ed and tuned this week and my tuner said it needs to be a wide band bung. Seems to be it’s a narrow band bung, therefore he’s going to have to drill and weld in a wide band one  

[blackout 1,136]

7 hours ago, Forrest20 said:

@blackout thanks, I currently have the R77 on my bike with the stock O2 sensor in it. However, I was wondering what size bung it is because I’m getting my bike dyno’ed and tuned this week and my tuner said it needs to be a wide band bung. Seems to be it’s a narrow band bung, therefore he’s going to have to drill and weld in a wide band one "> 

Usually dyno tuners feed a wide band sensor pickup into the muffler outlet.  Most all bikes will not have a wide band sensor.

[mossrider 3,050]

Just now, blackout said:

Usually dyno tuners feed a wide band sensor pickup into the muffler outlet.  Most all bikes will not have a wide band sensor.

Exactly what we did many times to tune mine. 

[Forrest20 0]

@blackout yeah. I’m having the narrow band bung cut off and a wide band welded on. My tuner was just wondering before I drove an hour over to him. 

[blackout 1,136]

1 hour ago, Forrest20 said:

@blackout yeah. I’m having the narrow band bung cut off and a wide band welded on. My tuner was just wondering before I drove an hour over to him. 

That's a good way to do it.  You'll be able to get an adapter to run the narrow band in an 18mm wide band bung after the tune if needed.