[SteveThackery]

I think it's a good bet that the blued area is the one where the reducer extends to 

That's gorgeous!  I love that blue colour.

[caricabasso]

This is the exhaust valve of my bike, after 40.000 kilometer.

[Arizoni]

Is that with a carburetor or with fuel injection?
If it is with fuel injection, do you have an O2 sensor on the exhaust pipe?

[caricabasso]

Is that with a carburetor or with fuel injection?
If it is with fuel injection, do you have an O2 sensor on the exhaust pipe?

Is with  fuel injection and with the 02 sensor on the exhaust pipe.

[JVS]

I haven't seen it. I just read from users that it was there. It may or may not be the same as the earlier header from H.
Anyway. If there is some length inside the header that continues the same port exit diameter for some length, that would be a good thing for tq.

I thought hard about this, and I remember noticing that the starting of the new header pipe's ID? did match the exit diameter of the port, before I installed it.

No, no!!  This is a Royal Enfield we're talking about.  Your contribution to the greater good is to keep installing stuff until it doesn't work any more.  Every RE owner knows this.   

 

This is the exhaust valve of my bike, after 40.000 kilometer.

Seems like yours is running good also. Does your commute involve a lot of start/stops, short trips?

[High On Octane]

This is the exhaust valve of my bike, after 40.000 kilometer.

That looks like a nice healthy burn there. 

[caricabasso]

Seems like yours is running good also. Does your commute involve a lot of start/stops, short trips?

On winter there are  short trips and the  engine does not reach the optimum operating temperature.

[JVS]

Cheers.

Thumping in Italy must be heavenly 

[caricabasso]

Cheers.

Thumping in Italy must be heavenly 

Yes:

https://www.facebook.com/pages/Thumping-Italy-Mille-miglia-con-la-tua-Royal-Enfield/622872331093585

[gremlin]

......... Just wanted to ask what you guys/girls think of the condition of the exhaust valve, as shown in attached pictures........

That's exactly what mine looked like three thousand miles ago, after running the stock exhaust for the first 2500 miles.

I havn't looked at it since....  but, B5 is still running