P.S. thanks for the cold CT advice by the way. I do always warm the bike up before riding. I can't imagine what this bikes like if you treat it badly!!! Kill me

Are you sure the battery and charging system are OK? the ecm relies on the battery voltage being ok for it to receive the correct inputs from all of the sensors.

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

I wasn't offering to teach you how to use EcmSpy

I offered to hook your bike up and see if we can find a problem, I can even hook up a palm and send you for a ride to get a data log. I've got loads of spares too, so we can try fix by substitution if all else fails. Can even give you a better set of maps to try.

There are a few unanswered questions though that might help pin things down.
You say you had 400 trouble free miles, in one hit? A round trip 200 each way?

When you did short trips to attempt diagnosis, did you ride from cold each time, everytime?

And do you have a stock ecm to try?

Having to blip the throttle on start up is plain wrong. Even my race bikes start on the button with no throttle. On open pipes,big injectors and far from stock mapping. On E85 I had some issues but have mapped most of them away.
Dodgy plugs would cause trouble all of the time, as would a knackered idle valve.
Cold start issues would only be a problem when the engine was truly cold.

There are plenty of electrical gremlins lurking to catch us poor unsuspecting 1125 owners. Sensor grounds, ignition switches, dodgy charging systems et al.

However the only similar stalling issue I have come across was also on an EBR race ecm.

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Nige...1125d 9.43@140mph

Hi Guys,

Right, just went out for an hour or so (bloody freezing by the way!) and the bike did seem to behave better. I could tell that it was stumbling a little around the 2000-3500 rpm section of the rev range but didn't cut out. I have gone and bought some new spark plugs merely to eliminate that possibility, I will try to install them tomorrow if I can get back from work a little earlier.

Kevmean, I could well have a charging issue mate. I certainly have to put this bike on a charger far more frequently than any other bike I have owned. Using the display, the bike does seem to be charging the battery (14.1 volts) but certainly not much at idle after warming up. Charges at idle when cold but not once warm. If I go on a long journey it seems to be okay.

Nige, that is incredibly kind of you! I will try and find a few dates that I could make it to Birmingham and get back to you. Obviously, most importantly, let me know when it is convenient for you. The 400 miles covered at Christmas were mainly made up of 4 long trips and a couple of back road blasts, Didn't put a foot wrong.

All the best,

Harry

Sorry, not that good at this yet............

The short diagnostic trips were mostly from cold I think.

Sorry again,

Unfortunately, I don't have a stock ECM, the bike came with the race ECM from previous owner.

Also, Battyone, I called you Nige! Sorry about that

That's ok, it's in my signature after all

How long have you had the bike?

I think some of this is the normal 1125 lean fuelling, I've had two road worthy 1125r s -both turned into drag bikes- and neither were happy below 4k.
Been talked to death plenty of times on here. They certainly don't ride like a normal grunty V twin.

I have a simple cure and a few members on here have already reported the great results.

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Nige...1125d 9.43@140mph

Maybe the lack of charge at low revs when hot is just the relay mod that was done by Harley to stop them from frying the stator kicking in, which just makes me wonder if the race ecm is set up correctly for this. It uses a combination of temperature and revs to decide at what point it drops the alternator from 3 phase down to single phase to prevent the windings overheating.

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

Mine ran very smooth from very low revs (but not as smooth as my Honda), however I am very aware of ones that run like a pig.

I keep toying with the idea of buying another, but a clunker, and getting to the bottom of the problems.

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08 Specialized Langster

Yep

Must get back up to you for the new map at some point

We've spoken about yours before and from my experience you were definitely one of the lucky ones.
My 09 just couldn't be ridden at less than 4k, which made 30 - 40mph zones a real pain. If I shifted 1st to 2nd too early hitting 2nd below 4k then it felt like I'd gone straight to 6th.
The 08 wasn't quite as bad,but I still wouldn't want to commute on it.

Turning the O2 sensors off and adding more fuel makes a huge difference. Such big bores simply cannot burn smoothly at such lean mixtures.

You certainly can't ride them like old fashioned twins. But then old twins don't rev to 11k+ and make 140+ hp
But it's a shame, my bonnie will pull away at tick over. Makes it easy to ride in the wet. The 1125s were plain lethal on damp roads. Good job I only wanted them for drag racing

As far as charging goes I thought this was an 08 bike??? If so then the parasitic drain will be an issue, so a battery tender is the best fix for that. If it had a stock ecm fitted it would rev it's tits off if started with a low battery. Scary the first time it happens, but necessary as there's so few spare amps at idle.

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Nige...1125d 9.43@140mph

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Nige...1125d 9.43@140mph

Hey guys,

Have had the bike since June last year I believe and yes it is an 08 bike. Moreover, I think it does have the Harley charging harness fix thing. Battyone, sounds like are definitely the man for the job!!! Really looking forward to being able to get over to Birmingham.

Managed to get home a little early so just changed the spark plugs. Both old plug gaps were way out of spec and the rear one looked dark and corroded (white thread) - maybe a little water ingress stopped it sparking correctly? Need to get some high temp grease.

Anyway, this seems to have had a very positive impact on driveability. Still grumbly at about 2000-2500 revs but much, much better.

Still had to give the bike a blip at first idle to get over that hurdle I have mentioned before. By the way I should probably explain this a little better. I don't have to open the throttle to start the bike. The bike (usually ) starts perfectly and idles fine. But, if I don't blip the throttle once before setting off it will stall. After that it's fine for the rest of the ride. When I start it again, however........... and so on.

The strange thing is this bike has always been really quite smooth at low revs especially since EBR remapped my race ECM for the HMF exhaust (certainly no Honda!). This problem has been very recent.

Anyway, thank you all very much. What weekends are you free Battyone? Please pick sunny warm ones

Sunny warm weekends I'm mostly away racing

But not till the end of March/beginning of April.

If it's an 08 it shouldn't have the extra charging harness! Check the cable from the alternator, it should go direct to the regulator/rectifier. The HD fix was only needed for 09 and up but may have been fitted in error as yours was registered later.
Although as remedial work is normally based on VIN no. it shouldn't have happened.

As you have an EBR ecm it might be worth trying a tps reset everytime you fire up.
Was a necessity on the TwinMotorcycles ECM, bike ran like a dog if you didn't.

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Nige...1125d 9.43@140mph

Maybe simple Nige, but boy what a huge difference.ps hope your feeling better mate