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O2 Weld On Bungs - (18mm + Radiused + Wide Coverage)


Product Description

Sold as singles or choose quantity 2 for twin cylinders.

Use these beautifully machined 304 stainless radiused and flanged O2 bungs when wide band 18mm x 1.5mm O2 sensors are being added such as an Auto tune from Dynojet. New model KTMs use 12mm ports that will not work with wide band O2s and necessitate the addition of these 18mm O2 bungs. (Note: the Auto Tune kit comes with 18mm bungs but they are mild steel and will rust. These are for someone who want's the best on their stainless headers) This flanged O2 bung has a wider coverage than our radiused 18mm O2 bung. This helps spread the load on thin tubing and looks like a faceted diamond with the way it is machined. If you want only the best, this is it.

Notes, suggestions and precautions: Newer model 1190 and 1290 engines come with 12mm narrow band O2s. If Dyno Jet's Auto Tune is also being purchased, it comes with 18mm weld on bungs but are of low quality and will rust after welded. Use a 3/4 (20mm) hole saw or good quality step drill to make the hole before welding. Once these stainless bungs or Auto Tune's 18mm wide band O2 bungs have been installed, the user has two options:

  1. Grind off the old 12mm ports in the exhaust and then add these or Auto Tune's mild steel 18mm bungs. You can then use our 12mm to 18mm O2 adaptors if for some reason you need to return to the stock narrow band O2s.
  2. Weld these 18mm bungs just after the stock 12mm narrow band O2s and use these 12mm plugs to plug the stock O2 ports if removing the now not enabled stock O2s is desired.

Product Reviews

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  1. Well made product 5 Star Review

    Posted by on 25th Jun 2018

    Looks OEM once in place so very well made.

  2. 2016 Husky 701 4 Star Review

    Posted by on 4th May 2018

    Nice option to avoid rust, but due to the curved location near the exhaust port on this bike, this bung doesn't fit as well as it would on a straight run of pipe. However, it's a nice CNCd piece and works fine with tweaking.

  3. Send your headers in 5 Star Review

    Posted by on 18th Mar 2018

    When I purchased these I had the intent of locating a local welder to have them welded locally, I am so glad I didn’t do that. I sent it in to Rottweiler to have them welded and I could not be happier with the final product, the quality of the welds are on par with Akrapovic’s in my opinion.

  4. bungs 5 Star Review

    Posted by on 9th Dec 2017

    well worth the price. I'm very happy I went with these.the standard auto tune bungs are crap.

  5. Ktm1190R 5 Star Review

    Posted by on 17th Sep 2017

    Nice bit of gear. These look good and are easy to weld in.

  6. o2 wide coverage, radiused, bung 5 Star Review

    Posted by on 12th Jan 2016

    quality product,
    the wide flange is nice for better connection to pipe. Looks awesome. Don't regret spending extra $

  7. 2015 ktm 1290 superduke r 5 Star Review

    Posted by on 20th Oct 2015

    Works good cut the smaller o2 off and wielded these on fifts good around the pipe.

Shipping Weight:
0.12 LBS
Usually ships within 24 hours
Calculated at checkout