SE 1150 stalling

[Nin]

Hi all

Some guidance please. I set of for Cornwall and after filling up with normal unleaded (I've been using Super til now).

A few miles in the bike starts to stall at tickover - rolling up to junctions for example. Thumb the starter and she fires up no problem.

At full revs it runs ok but not quite as much punch as before.

I'm thinking stick coil or leaking inlet manifold.

Nin


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[Nobby]

I always had a difference between fuels on power and smoothness. Never cutout.

 

[Jamieboy]

Stick coil I reckon. I had the same symptoms. Would occasionally cut out when coasting to a stop. Looked into more complicated things then realised I was overlooking the obvious.

 

[DrFarkoff]

leaking inlet manifold usually causes them to rev up

Worth sticking a spare plug in the secondary plug lead and grounding it, as that's an awful lot of energy to be going no where ( personal opinion and taught to me by my grandfather and father some people just let them hang )

Also check the rubber diddies on the vac take offs while you are checking stick coil

 

[Nin]

Cheers all. My reasoning on manifold was that To get the TBs balanced I've got very different settings of the BBS = a leak somewhere.

A new symptom of occasionally misfiring at normal road speed is turning me more towards the coil. Is there a way of testing them?


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[topcat2006]

I had similar on my 1100 - it was the "O" ring on the bottom of the brass adjustment screw for the throttle body balance.

You can test for air leak with a lighter refill spray. Just spray it where you think there's a leak - if revs rise you've found it.

Hth.

Tom

 

[DrFarkoff]

A new symptom of occasionally misfiring at normal road speed is turning me more towards the coil. Is there a way of testing them?

You can either unplug both lower plugs (and stick old plugs in them and ground them out on exhausts or using jump leads plug nut to exhaust usually is a good one) or you can take the tank off and unplug the 12 volt connector at the coil itself

When you start the bike if it is running on one you have a duff coil

leave it running 10 to 20 seconds and the hot exhaust header is the good stick

Actually if you have a few miles on the bike its good practice to change them for the more modern 1200 ones that seem to have both better ooomph and the materials are less prone to corrode

 

[Nin]

Cheers Dr. I shall do that.


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[DrFarkoff]

Tom that's quite a fire risk right there all you need is an errant spark and wooof you have a fire

WD or any NON spirit/ethyl alchol, based looseoil will work much safer

You can test for air leak with a lighter refill spray. Just spray it where you think there's a leak - if revs rise you've found it.

 

[DrFarkoff]

THE BBS Get clogged up with Oily deposits

It's worth removing them cleaning them and replacing the o rings and spray a few squirts of carb cleaner gently in the recess whilst running the motor it'll splutter and smoke but its doing no harm

Refit BBS with a LIGHT smear of red rubber grease N.B. if you put too much grease on it will hydraulic and split the threaded part!

Also Make sure you have free play on the cables! If you have no free play and the butterflies are being held open for whatever reason BBS will make feck all difference

Worth looking at the adjuster up under the throttle side switch gear in case some cnut was phaffing with it

Cheers all. My reasoning on manifold was that To get the TBs balanced I've got very different settings of the BBS = a leak somewhere.

 

[Roadcaptain]

did you make Cornwall?

I am in Devon and have some sticks you can try.

 

[Nin]

Many thanks Roadcaptain. I baled out and took the Audi A2 in the end. I had to visit my very elderly uncle on the way down so had no time to fettle.

Thanks for the offer though.


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[Steptoe]

Pull off the lower plug caps from the plugs and see if the bike runs on just the main plugs. Simple test takes seconds and instant diagnoses.
Don't worry about having to attach other plugs in the leads and all the bollox about earthing them. They only need to be disconnected for a few seconds, you're not riding around europe to test them.

 

[Nin]

Cheers Neil.


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[Nin]

Right chaps - update. Both coil sticks have been replaced with know good ones even thought the diagnostics trick showed the others weren't failing.

I'm still getting the problem.

It seems to be on the transition from idle mixture to picking up on the butterfly. A number of things to note:

The injectors have been off, been cleaned and had new 'O' rings fitted.
Throttle cables and Bowden box have been replaced - the lhs cable adjuster is screwed right in as far as it will go and barely gives 1mm of play, but ...
The TBs are balanced at 3k revs and at tickover but at quite big difference in BBS settings.
Plugs, air filter are new, valve clearances are newly done
The heads and barrels have been off and on again, with all valves out and back in.
It has a GSJohn stage 10 chip, y piece and standard exhaust.
Plugs look ok but then this is a low revs thing I reckon

My next avenue of investigation is the throttle cables and Bowden box - welcome any advice, banter or piss-taking.


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[tuftywhite]

What about the lower coils?

 

[Nin]

What about the lower coils?

Yep, runs on just them as well.


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[Ian J Hartley]

Was the bike running OK before you chipped it?

For what it's worth.

I'd be sticking the original chip back in to confirm it's not the chip.

At the same time, it might be worth removing the plug to the motronic and make sure none of the sockets are pushed back into the connector, sometimes the contact does not lock into the plug housing so you end up with a poor connection.


Ian

 

[Nin]

Hi Ian

Yes it was doing this before I chipped it - but interestingly it stopped when I ran it on a tank of super-unleaded, which makes me think it's a fuel related issue now.

I'll do the work to eliminate TBs and cables from the equation and see where we get to - if that doesn't do it I wonder if there's something going on with the ECU or sensors - it only does this when the engine is hot.



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[daveg]

Hi Nin. I had a problem on a trip recently, same bike as yours. After exploring everything including replacing the stick coils it was still there.
I eventually took it to Steptoe who plugged it in to his analyser and diagnosed an intermittent TPS fault. Seems to be ok now I've replaced it but I haven't been on a trip and got it really hot since.
I'd never have found the fault without the analyser.
http://www.ukgser.com/forums/showthread.php/434740-Cough