Fast Idleing / Hunting

pingu-nz · Nov 19, 2017

Yes Tony correct

The power commander requires the resistors or plug to disable the oxygen sensors.
They are a common 330 ohm resistor from any electronics shop, or you can buy a special plug at 100x the cost .
The resistor stops the check engine coming on .
I also have the resistor in my triumph tiger 1050 ,it doesn't have a power commander ,but it use to surge at low revs around town.disable the oxygen sensor and steady fueling.

cheers
Paul

contours · Nov 19, 2017

pingu-nz said:
I also have the resistor in my triumph tiger 1050 ,it doesn't have a power commander ,but it use to surge at low revs around town.disable the oxygen sensor and steady fueling.

That's very interesting. My S3 1050 also surges at low RPMs. Pretty annoying, but I've come to tolerate it.

With the Triumph the O2 sensor is located on the exhaust header, right? Same with the Norton?

BPHORSEGUY · Nov 19, 2017

In regards to adjusting the idle screw, the ECU basically controls the idle. That screw that we all call the "idle screw" actually controls how quickly or hard the throttle bodies snap shut when we backoff the throttle. On my bike there was a very narrow window, maybe 1/8 of a turn, where the bike would either stall at stoplites or the idle would hunt and go up to 1800-2200 RPM when hot after a hard run! In "the sweet spot" it runs perfectly! The engine must be at normal operating temperature to adjust. Basically if your bike stalls when hot adjust the screw clockwise until it doesn't and then take a hard run to make sure your idle doesn't go to 2000 RPM after a hard pull! I would only go in 1/8 turn increments since the adjustment is so critical.

I played with the adjustment a lot when my bike was new but after going to map 91 it seemed to not idle at 2000 RPM or more after a hard run or it had a "bigger sweetspot!

And remember as Richard says add a nut to the bottom of the screw or I use loctite. Once you find the sweet spot you don't want it to creep under vibration! I think the screw is 3MM IIRC.

pingu-nz · Nov 19, 2017

contours said:
That's very interesting. My S3 1050 also surges at low RPMs. Pretty annoying, but I've come to tolerate it.

With the Triumph the O2 sensor is located on the exhaust header, right? Same with the Norton?

Yes pull the plug and install a resistor ,you will notice a big difference

LEXngton · Nov 20, 2017

pingu-nz said:
Yes pull the plug and install a resistor ,you will notice a big difference

I would love to do just that because after just installing a new MAP my 2016 961 is once again hunting when it gets hot

Problem is I have no idea how to actually install the resistor. Any chance a step-by-step manual could be made by someone???

BritTwit · Nov 20, 2017

Not sure if the O2 sensor eliminators are the same for the 961, but here the units for various Jap sportbikes.

https://www.ebay.com/i/330866352998?chn=ps&dispctrl=1

pingu-nz · Nov 20, 2017

LEXngton said:
I would love to do just that because after just installing a new MAP my 2016 961 is once again hunting when it gets hot Problem is I have no idea how to actually install the resistor. Any chance a step-by-step manual could be made by someone???

Have a read of this page

Broken link removed

This is how i installed mine ,so it can be reversed if needed.

cheers
Paul

TonyA · Nov 20, 2017

pingu-nz said:
Yes Tony correct

The power commander requires the resistors or plug to disable the oxygen sensors.
They are a common 330 ohm resistor from any electronics shop, or you can buy a special plug at 100x the cost .
The resistor stops the check engine coming on .
I also have the resistor in my triumph tiger 1050 ,it doesn't have a power commander ,but it use to surge at low revs around town.disable the oxygen sensor and steady fueling.

cheers
Paul

Thanks for the reply .

961Story · Nov 22, 2017

Can I ask, why do you need a resistor?
Simply unplug them. No resistor needed.
Or remove your cylinder head and cylinder as Richard has suggested .......?

pingu-nz · Nov 22, 2017

961Story said:
Can I ask, why do you need a resistor?
Simply unplug them. No resistor needed.
Or remove your cylinder head and cylinder as Richard has suggested .......?

If you simply unplug the oxygen sensor you will get a engine light on the dash .
The resistor send a voltage back to the ecu so it does not activate engine light
Cheers
Paul

Fast Eddie · Mar 24, 2018

So, to simply test this to see what the difference is, we don’t need the resistors, so long as we accept the dash light will be on?

MxMartin · Mar 24, 2018

Fast Eddie said:
So, to simply test this to see what the difference is, we don’t need the resistors, so long as we accept the dash light will be on?

In theory... but if the ecu detects a faulty sensor it might apply other 'limp mode' settings. I'm not saying, just second guessing.

gchoppin · Mar 27, 2018

pingu-nz said:
Richard
Both my tiger 1050 and Norton have oxygen sensors disabled and 330 ohm resistors installed.
This stops the check engine light comming on and smooths out the fueling around town at lower revs.
You can buy a fancy $30 plug to install or a 30 cent resistor from jacar .
Cheers
Paul

OK the O2 sensor is a four wire harness. Which two wires did you connect the resistor to?

Fast Eddie · Mar 27, 2018

I’m still VERY unclear here too.

The earlier picture showed two relays per plug. Two different relays at that.

The plug has four wires.

The 961 has at least 3 different wiring schemes, with different coloured wires at the plug.

It would be great if someone could step in with clear instructions and pictures from a 961...

Welshrugby · Mar 28, 2018

BPHORSEGUY said:
In regards to adjusting the idle screw, the ECU basically controls the idle. That screw that we all call the "idle screw" actually controls how quickly or hard the throttle bodies snap shut when we backoff the throttle. On my bike there was a very narrow window, maybe 1/8 of a turn, where the bike would either stall at stoplites or the idle would hunt and go up to 1800-2200 RPM when hot after a hard run! In "the sweet spot" it runs perfectly! The engine must be at normal operating temperature to adjust. Basically if your bike stalls when hot adjust the screw clockwise until it doesn't and then take a hard run to make sure your idle doesn't go to 2000 RPM after a hard pull! I would only go in 1/8 turn increments since the adjustment is so critical.

I played with the adjustment a lot when my bike was new but after going to map 91 it seemed to not idle at 2000 RPM or more after a hard run or it had a "bigger sweetspot!

And remember as Richard says add a nut to the bottom of the screw or I use loctite. Once you find the sweet spot you don't want it to creep under vibration! I think the screw is 3MM IIRC.

Simon Skinner has warned us not to adjust the idle screw, I did mine slightly and now the throttle bodies have to be recalibrated. I believe the main concern is that the screw could vibrate loose but best to read his posts on I think it was the 50th anniversary thread and states it in the downloaded manual he let us have.

richard-7 · Mar 28, 2018

Welshrugby said:
Simon Skinner has warned us not to adjust the idle screw, I did mine slightly and now the throttle bodies have to be recalibrated. I believe the main concern is that the screw could vibrate loose but best to read his posts on I think it was the 50th anniversary thread and states it in the downloaded manual he let us have.

Did you get my email about that i sent out a few weeks back?

Welshrugby · Mar 28, 2018

richard-7 said:
Did you get my email about that i sent out a few weeks back?

You sent an email to me? i was following the conversations about it here on the forums but cannot recall any email.

richard-7 · Mar 28, 2018

Welshrugby said:
You sent an email to me? i was following the conversations about it here on the forums but cannot recall any email.

Are you on my email list?

richard-7 · Mar 28, 2018

Welshrugby said:
Simon Skinner has warned us not to adjust the idle screw, I did mine slightly and now the throttle bodies have to be recalibrated. I believe the main concern is that the screw could vibrate loose but best to read his posts on I think it was the 50th anniversary thread and states it in the downloaded manual he let us have.

Hope you’re not paying for this “recalibration”

TonyA · Apr 5, 2018

Hello , Ok just got in the O2 sensor eliminator plugs . I am not telling you to eliminate your O2 sensors ! I just wanted to finish this thread with a little more clarity. The Norton 961 uses a 4 wire O2 sensor , 2 white and a 1 black and 1 grey wire . The white pair is a built in heater that Norton may NOT use and the black and grey pair is the signal with grey as signal and black being return. The eliminator plugs have a 330 OHM resistor across the signal pair. That is the grey and black , a 330 ohm resistor across grey to black. The white pair has a 1 Megaohm resistor across white to white. This is viewed from the O2 sensor plug end . Both resistors are 1/2 watt. The eliminator I ordered is the model that has the correct end plug like Aprilia ETV 1000 and fits Norton 961 . This was the ebay link that nopdog or pigunz sent . Just look up WHEELZ CONNECTORS UK he sells on ebay.