1199 drops onto one cylinder

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PaulC996

Joined
Jan 30, 2021
Messages
27
Location
Alexandria, VA
Riding along on the 1199R yesterday and after 100 miles of running fine, I see the engine warning light flash on and it appears to drop onto one cylinder, for maybe 2 seconds, then it's fine again. Get a few miles down the road and I'm nearly home and it does it again, but does not kick back in. Tried changing maps just in case, but no luck. Tried what my brother calls an 'italian tune' by getting revs up, but would not pull past about 5k and no improvement. Still running for a bit until I get off the highway and have to stop at some lights, and it dies. Looks like fuel/oil coming out of the exhaust pipe from the rear cylinder and over the rear mudguard. Haven't started pulling apart to diagnose yet, but any good ideas? Was fresh fuel from a gas station I've used multiple times before, and plug was only changed 600 miles ago. Bike has only done 2500 miles. No bad mechanical noises, and oil level appears fine, no evidence of coolant in the oil etc, but I haven't dropped the oil to see if any issues. I'm hoping maybe just a blocked injector?
 
Yeah first thing I would look at make sure one of the primary injectors is not plugged if that's not it then make sure the spark plug cables and coils are ok.
 
Bad MAP sensor can cause revs to max out around 5k- each cylinder has one- cheap and easy to replace- both on left side.


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Parts ordered to run melcodiag, as I think it will be a useful addition to the toolbox anyway. Will then see what it tells me and go from there.
 
Decided I'd give the easy option a go, replaced the rear spark plug. New plug in and turned it over, fired straight up. Appears to be running cleanly.
 
Follow up - took the bike for a run. Topped up with a couple of gallons of fresh Shell 93 premium and then on to open road so I could open it up a bit. Appeared to be running smoothly, pulling well. After 10 miles and nearly home, did the same, dropped on to one cylinder. Grrr!
 
I’d swap coils and see if it still happens on the same cylinder. If the failure moves to the other cylinder then it’s the coil.
 
Sounds like you are fowling a plug, fixed with new plug and worked fine.
I would go back to the injector theory.
Pull the injector, does it look normal?
I had one go and it gave me normal power to about that same rpm, it would go past it but then studder under full throttle.
 
A map sensor can also cause lots of revs. I had that problem on my 1199, and I replaced both map sensors , bike runs fine now.


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So given my local shops can't get the bike in for a few weeks, I thought I'd try the coil option. Ordered a new one in and fitted it. Bike started fine, no engine warning light, so went out for a ride. Stayed close to home doing short legs out and back, where I could open it up a bit though. Appeared to be running smoothly, but after 30 minutes did it again, dropping the rear cylinder. Wait to the next morning and engine warning light is out and bike will start, but now running a bit rough. Cant get the MelcoDiag to work despite trying a few different things, but if the engine warning light is clearing would it even have a fault code to look for??
 
PaulC996 said:
So given my local shops can't get the bike in for a few weeks, I thought I'd try the coil option. Ordered a new one in and fitted it. Bike started fine, no engine warning light, so went out for a ride. Stayed close to home doing short legs out and back, where I could open it up a bit though. Appeared to be running smoothly, but after 30 minutes did it again, dropping the rear cylinder. Wait to the next morning and engine warning light is out and bike will start, but now running a bit rough. Cant get the MelcoDiag to work despite trying a few different things, but if the engine warning light is clearing would it even have a fault code to look for??
Click to expand...
My 899 did this exact thing and I ended up riding it 60 miles home IN THE RAIN on one cylinder. The front coil wire was arcing across to the radiator, and it was way worse when it was wet out. I have a video somewhere but not uploaded to any sites except FB.

Check to make sure your coil wiring (front and rear cylinders) aren't contacting anything they shouldn't be. Mine happened after a 15k valve service, and the zip tie holding the wire to the plastic piece was missing, allowing it to get closer than normal to the radiator.

edited to add: I just ordered new wires and replaced both, never had the issue again.
 
So having changed the coil and not being able to easily get my hands on a set of spark plug leads (really, they need to order them in from Italy!), replaced the MAP sensor. Got out for another ride and after 90 minutes and 60 miles it appears to be OK now. Who'd have thought a failed MAP sensor would have you stranded on the side of the road!
 
My failed MAP sensor didn't stop the bike from running, but prevented revs above 5k. Easy and cheap fix-- I replaced both---
 

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