Catalytic converter in muffler

[CROSSBOLT]

Can anyone steer me to what effect removing cat converter will have on our EFI bikes? No problems here, not yet anyway but curious about just running without one. Like having to replace muffler means huge dollars as opposed to cutting open, repairing, welding shut. Minus cat converter.

[scooterfan]

For what it’s worth - to my understanding it all depends on the location of the 02 sensor in the exhaust system.
My previous bike was a Honda NC700. Cat removals has been discussed at one of the NC 700 forums and owners started removing cat convertors without having any problems. At some stage somebody mentioned that the reason for not having problems, is the specific location of the 02 sensor. So I decided to remove the cat on my Honda as well, and I never experienced any problems.
Unfortunately I can not remember at what spot the sensors are located at the Hondas - but I guess cat removals on these scooters should also not cause problems if the sensors are located at a specific position.
As far as these scooters are concerned - I guess unless somebody remove a cat, or somebody install an aftermarket muffler without a cat - nobody will know whether a modification like this will work.

[CROSSBOLT]

Saw some discussion on Advrider.com about this. The O2 sensor on these is ahead of the muffler/ cat so it does not know anything but mixture.

[Stig / Major Tom]

Saw some discussion on Advrider.com about this. The O2 sensor on these is ahead of the muffler/ cat so it does not know anything but mixture.

Yep, my LIKE's O2 sensor is bolted in well ahead of the muffling stuff.
(thread reminds me of my first Honda bike - inherited when my buddy went back to finish his degree at Tehachapi St. Prison. I used a Hunt's tomato can for the muffler. 1967, no O2's in those days - though goodness knows SoCal could have benefitted from them!)

Stig

[CROSSBOLT]

Finish his degree! Har, har!

The reason I ask is hopefully I will get beyond 22000 miles on this DT and if the muffler rust out or the cat converter plugs up I might rebuild or replace muffler without the cat if no downside.