Winter storage

iwilson said:

SCS Delta 400. Remove the entire idle air system and stick a plug in the hole of the ‘balance’ pipe to prevent any air or fuel transferring between each cylinder. Adjust the idle air control screw on the butterfly assembly just enough to achieve a stable idle at cold but not enough to give a high idle when warm. Job done!.

End result is an engine capable of starting from cold without any choke or idle control.

800rpm cold, 1,200rpm when warm. Plugs are now three years old and no reason to suggest they need replacing.

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Bernhard said:

This confirmed my suspicion, half the parts designed to improve the engine don't even have to be there!

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MAK said:

One last question..
What did you do with the plug to the IAM.
Can you switch it off at the ECU
Or just tape it up out of the way.

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iwilson said:

Swinging in the breese so to speak... (the plug). Honestly cannot remember what I did in terms of the ECU. I had a lot going on with dyno runs and mapping the engine. It may be possible with the stock ECU to just get rid of it all and see what if anything happens error wise. I suspect nothing will happen. At the time I was battling multiple fires and as much I documented changes there are only so many hours in the day! Mixed up with kids vids in my YouTube channel there’s a ton of Norton vids, many are unlisted as they were directed at Norton and Jenvey. Water under the bridge now so I might just make them public, although they might not make much sense without context.

It only takes 20mins to disable it all, plug the pipe and adjust the idle screw. I’m not selling anything, just sharing what I’ve learnt and I’ve spend thousands in diagnostic equipment because I just love buying tools!

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MAK said:

Like the saying goes..
Get the kids interested in motorcycles and they will have no money for drugs

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iwilson said:

Kids are more interested in Fortnite.... No bad thing when I think what I got up to. Yamaha RD400 was an interesting introduction to the world of mental 2 strokes!

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iwilson said:

Swinging in the breese so to speak... (the plug). Honestly cannot remember what I did in terms of the ECU. I had a lot going on with dyno runs and mapping the engine. It may be possible with the stock ECU to just get rid of it all and see what if anything happens error wise. I suspect nothing will happen. At the time I was battling multiple fires and as much I documented changes there are only so many hours in the day! Mixed up with kids vids in my YouTube channel there’s a ton of Norton vids, many are unlisted as they were directed at Norton and Jenvey. Water under the bridge now so I might just make them public, although they might not make much sense without context.

It only takes 20mins to disable it all, plug the pipe and adjust the idle screw. I’m not selling anything, just sharing what I’ve learnt and I’ve spend thousands in diagnostic equipment because I just love buying tools!

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MAK said:

Could I remove the IAM unit on a 2016 961 with an Omex ECU fitted.
Could be quite keen to try this if I have any further idle problems.
Also would you recommend a Delta 400 for future consideration.
Cheers

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iwilson said:

Just unplug it, if the ECU doesn't go silly then you're good to go. It's only a 20 minute job to do the conversion. Be careful to ensure and check the injectors are seated in the fuel rail. I had fuel squirting everywhere on a few occasions (just key the ignition on and off a few times to pressurise the fuel rail without starting the engine).

Once you've removed the IACV assembly you need to set the idle with the throttle position screw. It needs to be carefully adjusted so the hot idle is not to high and the cold idle not to low can be a fit fiddly to get right but only needs to be done once . In doing so the ECU will see the throttle as being open a little bit, whereas this is actually the new zero position. Don't know if the OMEX has an auto zero function. If you have the Delta 400 then you can just make the adjustment in the software.

Here's the original thread from a few years ago. Just had a quick refresh and noticed I'd observed the engine running quite rich at idle with the IACV removed, but I had also disabled the o2 sensors. On a bike with them the ECU would have been able to trim the fuelling, but as I have the Delta 400 I just trimmed it myself.

Idle problem solved

New thread to make the topic a little easier to find in the future. As some of you know I've been trying to understand and fix the idle problem in this Thread. Short story, discovered cylinder 2 steals fuel from cylinder 1 at idle via the IAC pipe that links both throttle bodies. This can cause...

www.accessnorton.com

The Delta 400 gives you the freedom to do whatever you want and the ability to tweak to your heart's content every single parameter and you'll find a mind boggling number of settings that seem to fly in the face of what should be a simple four stroke internal combustion engine! Bear in mind if you have an OMEX ECU you will need to purchase the adaptor harness from SCS as well.

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MAK said:

Thanks for the information,must have taken a lot of time to compile this.
I owe you a pint. Cheers.

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TonyA said:

I have some good news from SCS Delta :

Hi Anthony,



I hope you are well.



Yes, we actually purchased an EU3 Omex bike so that we can confirm full functionality of our kit. We have a full wiring translation for EU4 bikes, however because of Covid we have not yet tested this on a bike although have no reason to think that it wont work.



A full kit made of ECU, adapter loom and comms lead will be £833.



Best Regards



Matthew

Matthew Payne
Sales and Marketing Director
Specialist Control Systems Ltd
+44 (0) 1603 881558

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