TC, ABS and engine stalling during random downshifting

[joebwebb]

Originally Posted by JohanD

you were able to remove it completely? both ends?

Yes, both ends- it helps to have smaller hands. Remove the coolant reservoir, then unfasten the bracket which holds the MAP sensor, held on by a torx bolt. I was able to get the tube off of the exhaust manifold by gently pulling straight down in line with the nipple.

Reinstallation was a struggle. Warming up the tube to soften the rubber helped. Those with bigger hands might need to do some more disassembly.

Originally Posted by MotoJB

That's really interesting and good evidence to help explain the problem. Please let us know how you find the engine runs on the road and if and when it stalls again in the manner we've been seeing. How old is your bike and how many miles on the odometer? What fuel have you been using? 

Mine is a 2022 purchased in July of 2022 with just over 9000 miles on the odometer. I use regular 87 octane unleaded (E10). I've filled up with ethanol free a couple times but did not notice any change in character.

I will see how she behaves and report here if I notice any other changes.

[MotoJB]

That's really helpful. We are beginning to build a useful information base that could determine the cause of this abnormal behaviour. I suppose your 2022 bike has been updated with the most recent software version at its annual service.

I hope other members how have experienced the problem will provide similar reports.

Please keep us posted. 

[joebwebb]

Originally Posted by MotoJB

That's really helpful. We are beginning to build a useful information base that could determine the cause of this abnormal behaviour. I suppose your 2022 bike has been updated with the most recent software version at its annual service.

I hope other members how have experienced the problem will provide similar reports.

Please keep us posted. 

Mine has not had any of the software updates, as I have performed all maintenance myself so far.

[MotoJB]

Will be interesting to see if we can find a consistent pattern in the information about other bikes that have had the problem.

Good work Joe. 

[fred_jb]

Mine has just starting doing this today.  When slowing on a closed throttle, if I pull the clutch lever to feather the clutch or change down the engine cuts out.

It has also started feeling like the engine is about to die at very slow speeds with the bike reluctant to pick up speed, feeling almost like the clutch is slipping.

I had just done about 800 miles on a trip to Brittany with no hint of this engine stalling problem, though I did experience shunting or pulsing at slow speeds, but just thought maybe the chain needed adjustment, but it doesn't.

After being back for a week or so, I took the bike out today for a local ride, about a 50 mile round trip, and it started doing this on the way back.

Very strange, almost like fuel starvation, but only at low speeds, it runs as normal at high speeds and always restarts immediately after it dies.

[joebwebb]

It's very odd that the ECU allows the engine to drop below idle speed under no load.

[MotoJB]

Originally Posted by fred_jb

Mine has just starting doing this today.  When slowing on a closed throttle, if I pull the clutch lever to feather the clutch or change down the engine cuts out.

It has also started feeling like the engine is about to die at very slow speeds with the bike reluctant to pick up speed, feeling almost like the clutch is slipping.

I had just done about 800 miles on a trip to Brittany with no hint of this engine stalling problem, though I did experience shunting or pulsing at slow speeds, but just thought maybe the chain needed adjustment, but it doesn't.

After being back for a week or so, I took the bike out today for a local ride, about a 50 mile round trip, and it started doing this on the way back.

Very strange, almost like fuel starvation, but only at low speeds, it runs as normal at high speeds and always restarts immediately after it dies.

Have you any ideas about what might be the cause? Does the engine stall only occur after you pull in the clutch lever with the throttle closed? Do you intend to inspect the inside of the vacuum tube for the presence of a potential blockage? What fuel have you been using?

[MotoJB]

Originally Posted by joebwebb

It's very odd that the ECU allows the engine to drop below idle speed under no load.

Has the stalling problem or any other strange engine behaviour occurred since you cleaned out the vacuum tube?

[joebwebb]

Originally Posted by MotoJB

Has the stalling problem or any other strange engine behaviour occurred since you cleaned out the vacuum tube?

I've only ridden on a few short errands since cleaning the sensor tube. No stalls yet, and it's still starting on the first crank though not instantly.

[fred_jb]

Originally Posted by MotoJB

Have you any ideas about what might be the cause? Does the engine stall only occur after you pull in the clutch lever with the throttle closed? Do you intend to inspect the inside of the vacuum tube for the presence of a potential blockage? What fuel have you been using?

The engine cuts as soon as I pull the clutch lever, and 've no idea what is causing this, unless I disturbed a connection or breather tube during some work I did recently.  I was replacing the wiring to the 12V socket I have put on the right side of the bike to upgrade it to thicker wire and also making sure that part of the wiring loom is not rubbing on the shock as has been found on some bikes.

To make it easier to get at I removed the battery and airbox, so the first thing I will check is that the various tubes on the airbox have been put back properly, and that no electrical connections have been disturbed.

I also rerouted the clutch cable recently, so may put that back in case it is involved though I doubt it.

If there is a problem with the vacuum tube, if that is what it is called, then I would talk to the dealer about that.  I have also noticed the bike not starting on the first attempt recently, and sounds like that may be part  of this issue.