Question re. swapping cat-exhaust on an 1100

[motobiker]

My bike was originally an import and so has a catalytic converter in its original exhaust. I have managed to acquire nice and cheaply an almost unused UK spec (non Lambda) exhaust and want to get them swapped over.

The garage who will do this for me say I need a 'special' nut welding to the new exhaust to fit - i guess - the lambda probe to. Or they tell me the engine wont run correctly.

Is this true? Or is there some clever way to fix this? without all this 'welding' palaver??

If so.. what should be done with the lead that runs to the lambda probe (see pic)

Can it be disconnected at both ends and removed completely?

And what if anything should be done with - I guess the 'cat code' socket to tell the motronic how to work correctly once its 'catless'? (its currently 'empty')

many thanks.

BTW - I have no intention whatsoever of putting a remus or similar on the bike.. I really do prefer the looks of the original stainless steel exhaust system.

 

[Dragon Master]

Hi Tony,

You've got the same 'problem' as me. Mine was a German market machine originally and so had a cat. The Remus that was fitted when I got it had the hole/bolt for the lambda to screw in to, but the original I've just obtained doesn't.

I had a word with Roy at RGM near Preston. Told him the problem, and he found a coding plug on the parts list that codes it for non-cat running. It probably works in a similar way to Steptoe's 'two sapdes and a bit of wire' system for altering the coding on 1150s. I did ask Steptoe, but he's never had problems with 1100s, and so has never tried it on these. Just received mine today. I haven't tried it yet, 'cos the bike is still in bits, might try it when I put it back together.

The motronic is programmed to get information from the lambda, so just unplugging it won't work, it will look for the information, act on what it receives (nothing in this case) and set the engine accordingly. Just what 'accordingly' would be with an un-plugged lambda I don't know, and wouldn't want to try.

The coding plug does seem to fit the description of those Steptoe talks of in his 1150 'fix'; i.e. it has just two pins, which connect two different terminals, depending on the setting required. Apparently on the 1150 plugs, the two pins are just connected inside the plug, hence his bit of wire and two spades does the same job.

Not sure if there's anything inside the plug fro 1100, when I set it up I'll note the terminals it connects, and try the bit of wire method.

Why not give Roy a ring and have a word? (01772 603781), he seems a good bloke, and is highly recommended by many on here. (See 'Servicing in Manchester?' thread...). He should know what you're talking about, it's only last week he ordered mine.

Cheers,

Dave.

P,S. Er, what you planning with your original catted exhaust if you fit the new one successfully? I might be interested...

 

[motobiker]

Thanks for that.. I'll wait and see what others have to say.

seems remarkable to me that UK exhausts dont have the lambda wotsit and function quite happily - must be a simple way to convert my bike to UK spec without the welding palaver i've been told needs doing.

as for the original exhaust.. according to pidcocks its kernackered - hence the change over. my mpg is atrocious - pidcocks blamed the exhaust after plugging the bike into their diagnostic gadget and advised me to change it. They CAN do it - only i dont want to be forced to pay their highly inflated 'labour' charges.

 

[Dragon Master]

seems remarkable to me that UK exhausts dont have the lambda wotsit and function quite happily - must be a simple way to convert my bike to UK spec without the welding palaver i've been told needs doing

From my understanding, the lambda is there to keep the exhaust gas composition at the optimum for the cat to operate at its most efficient. So if no cat was fitted (as on UK market machines) no lambda circuit is needed.

I was told by Allan Jeffereis that the lambda reduces considerably the options for 'tweaking' when tuning the engine; mine used to pop and fart a lot when I first got it; they managed to reduce this, but not eliminate it entirely. But what remains could simply be down to the characteristics of the Remus.

as for the original exhaust.. according to pidcocks its kernackered - hence the change over.

That should have been obvious really; otherwise why would you be changing it?

Dave

 

[Steptoe]

Just what 'accordingly' would be with an un-plugged lambda I don't know, and wouldn't want to try.

...

I runs on fault mode. You'll hardly notice any difference. I know of a couple of 1150's that ran without any lambda probes, one a despatch bike, without any problems.


Your endowing the the 1100 motronic with more thinking power than it actually has.

 

[motobiker]

I runs on fault mode. You'll hardly notice any difference. I know of a couple of 1150's that ran without any lambda probes, one a despatch bike, without any problems.


Your endowing the the 1100 motronic with more thinking power than it actually has.

Thankyou Sir.


So the replacement exhaust can be fitted without any fuss?

Can or should the lambda probe cable be removed or disconnected at the top end.. where - i suppose it goes into the motronic?

 

[D6]

my 1150 runs without, and a techtronic, its spot on

 

[motobiker]

I still need to know before I proceed.


Can or should the lambda probe cable be removed or disconnected at the top end.. where - i suppose it goes into the motronic?

 

[davegs]

Lambada

Why not just tape it out of the way? save an awful lot of messing about.

 

[Dragon Master]

I runs on fault mode. You'll hardly notice any difference. I know of a couple of 1150's that ran without any lambda probes, one a despatch bike, without any problems.


Your endowing the the 1100 motronic with more thinking power than it actually has.

Cheers Steptoe! Story of my life, finding problems where there aren't any. I blame too much interference from Dr Sod for making me paranoid...

Dave.

 

[Steptoe]

.


Can or should the lambda probe cable be removed or disconnected at the top end.. where - i suppose it goes into the motronic?

Unplug it from the loom.

I'll let you work out how to find the plug at the other end of the lambda. example - think of it like your shoelace, you have hold of one end, and you desperately need to know where the other end is. Discuss.

 

[Noddy]

think of it like your shoelace, you have hold of one end, and you desperately need to know where the other end is. Discuss.

Can somebody help me with this please, i'm wearing flip flips

 

[motobiker]

Unplug it from the loom.


I'll let you work out how to find the plug at the other end of the lambda.

MARVELLOUS - Thankyou !!

I didn't know there was a 'plug' - for all I know it could easily have been wired directly into the Motronic. Thats great though, MUCH easier than I feared.