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Offline Itswatto

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Stalling engine
« on: 04 November, 2019, 08:58:16 AM »
Hi all,
I need some help please.  My Biffer will stall when I brake heavily with the clutch in.  If I brake normally it won’t stall.  I have a new battery, bike is an 08 with 10,000km.  Runs perfectly otherwise. It will start ok when it stops.  No fault lights show.  Could it be a tilt sensor?
Regards
Steve

Offline Fair Weather rider

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Re: Stalling engine
« Reply #1 on: 04 November, 2019, 12:59:36 PM »
Don't know much about Biffers as I have only just had mine, but I would say you are on the right track with the tilt sensor.
The symptoms you describe, certainly point in that direction.
I am sure some one else will answer your query, with a more definite and resounding YES!!!! it' the sensor.

Regards, Mike.

Offline Art

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Re: Stalling engine
« Reply #2 on: 04 November, 2019, 01:45:10 PM »
To give the 'tilt sensor' its proper name 'Bank Angle Sensor' and you'll realise the clue is in the name. The Bank Angle Sensor cuts the engine when the motorcycle is over on its side. Note here I've had mine resting on the engine crash bungs and that was not far enough over to cut the engine. I've also had it properly over with the tyres off the ground and it did what it does on that occasion and cut the engine.

I'd start off by checking, inspecting and testing the clutch switch, its wiring and connectors.

Offline FLIZ

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Re: Stalling engine
« Reply #3 on: 04 November, 2019, 02:31:07 PM »
Ditto, suspect clutch switch, or it’s wiring circuit, connectors.  Try braking, but only pull the clutch in just as you stop to prevent engine stall.

Offline Shed

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Re: Stalling engine
« Reply #4 on: 04 November, 2019, 02:35:24 PM »
Given this is happening when the bike is under linear momentum, I'd be looking for loose things first.

Check battery - is battery itself secure, all lead connections clean & securely tight?
Lift the tank, on the right hand side at the front there is a group of ground wires bolted to frame, are these all clean & securely tight?
Check side stand switch/connection/wires, if its bouncing/moving with g force when you lash on the brakes this could cut engine.

« Last Edit: 04 November, 2019, 02:40:52 PM by Shed »

Offline Itswatto

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Re: Stalling engine
« Reply #5 on: 04 November, 2019, 07:48:57 PM »
Thanks for the quick responses so far.  I have a new battery and all secure, so one thing off the list to check.   I will dig further. Does sound electrical and probably going to be interesting to find! 


Offline Itswatto

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Re: Stalling engine
« Reply #6 on: 05 November, 2019, 09:40:37 AM »
Progress this far:
Bank angle sensor bypassed - stalled
Kickstand switch bypassed - stalled
Checked clutch switch - working and stalled
Earth connection under tank all good

What other options do I have left?  Could it be something in the linked braking system?  Frustrating.

Steve

Offline Art

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Re: Stalling engine
« Reply #7 on: 05 November, 2019, 11:00:56 AM »
So back to square one
Normal (moderate) braking with and without clutch engine does not cut out.
Heavy (emergency) braking without clutch engine does not cut out.
Heavy (emergency) braking and clutch engine cuts out.

I'm assuming its an ABS model since the symptoms appear to narrow it down to clutch + heavy braking (ABS). The engine appears to be cutting out only when the ABS is activated (heavy braking) and the clutch lever is pulled. Therefore suspect a short between the clutch switch wiring and the ABS wiring.

« Last Edit: 05 November, 2019, 11:03:17 AM by Art »

Offline Itswatto

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Re: Stalling engine
« Reply #8 on: 05 November, 2019, 11:42:08 AM »
Moderate to heavy braking from 40-50km/h and above, when coming to say an intersection.  Clutch in, revs go down to 1100 then engine stalls just at about stop. Using hand and foot brake.  Abs has not kicked in.  Fuel tank full and clean fuel.

Offline g5guzzi

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Re: Stalling engine
« Reply #9 on: 05 November, 2019, 09:56:31 PM »
It may be worth checking the idle air control valve  as this regulates the air for
idle speed. It will be located somewhere on the inlet manifold. I have had the iacv
valve play up on my wifes 1200 sportster.
Another suspect to check would be the throttle position sensor  in case this is
giving incorrect signals to the ecu

Malc
« Last Edit: 05 November, 2019, 09:59:56 PM by g5guzzi »

 


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