O2 Sensor Help

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Dec 30, 2019 | 11:51 AM

Craigbrawler

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6th Gear

Joined: Dec 2019

Posts: 11

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From: United Kingdom

O2 Sensor Help

Hi All,

New member here!

I’ve recently bought a 1200 Sportster (it’s a 2004, Carb model. Rubber mounted).

I’ve just recently changed the pipes from the stock ones (the bike was pretty much stock all these years) and (what I believe to be) the o2 sensors seem corroded and not in good shape.

my questions;

1) do I actually need to run these sensors on an older carbureted bike?

2) if not, what do I have to do except plug the holes in the new pipes?

any help and advice appreciated! Thanks.

Dec 30, 2019 | 12:20 PM

rigidthumper

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Joined: Jul 2007

Posts: 3,723

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From: Bates County MO

Plug the holes with O2 bung plugs, using anti seize on the threads in case you ever decide to use O2 sensors to check how well the carb is doing.

Dec 30, 2019 | 01:06 PM

Midpegs

Outstanding HDF Member

Joined: Apr 2019

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From: Coventry , England

I also have an 04 carburettor model ( Roadster ) with a Vance and Hines system that has no O2 sensors at all, so clearly there's no need for them . I assume that these things are fitted to the exhaust headers somewhere .

Dec 30, 2019 | 01:23 PM

Craigbrawler

Thread Starter

6th Gear

Joined: Dec 2019

Posts: 11

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From: United Kingdom

Quote:

Originally Posted by Midpegs

cheers!

however, the bike does have the sensors already in situ. Reckon I should just plug them then see how I get on?

Dec 30, 2019 | 02:18 PM

Andy from Sandy

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Joined: Sep 2017

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From: England

O2 sensors are only any good for closed loop fuel injection system.

Dec 30, 2019 | 02:59 PM

WKNDS

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Joined: Nov 2012

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From: Newport,TN area

Remove the O2 sensors & plug the ports. Most likely they are 18mm, but will
depend on the year of the pipes you used, they could be 12mm.

Something like this is what you're looking for;

Amazon

hth,

T.

Dec 30, 2019 | 03:06 PM

Craigbrawler

Thread Starter

6th Gear

Joined: Dec 2019

Posts: 11

Likes: 1

From: United Kingdom

Thanks all.

I’ll give it a try and report back any issues/successes!

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Dec 30, 2019 | 06:37 PM

Imold

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Joined: Jul 2011

Posts: 27,096

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From: Frozelandia, Minnysota

My 1200 had drag pipes when I got it, replaced those with later model nightster pipes that had o2 sensor holes. Just put plugs in them, no further issue.

Dec 30, 2019 | 07:04 PM

#10

Midpegs

Outstanding HDF Member

Joined: Apr 2019

Posts: 2,180

Likes: 1,125

From: Coventry , England

Quote:

Originally Posted by Craigbrawler

cheers!

however, the bike does have the sensors already in situ. Reckon I should just plug them then see how I get on?

I wonder why I haven't got any surplus wiring then. Where exactly are these sensors ?
Here's a page from the 04 manual and I'm not seeing any sensors. I would have thought that 2007 EFI models would be more likely to have them .