I have a 98 916 that has been troublefree for almost 90000km, but when I started it this spring it would only run on the horisontal cylinder. I have another bike (supersport) and have not had time to look at it before today. It has compression, spark, and the timingbelt is on its marks. Had the fuelpump out and checked the houses. Everything ok. I also measured the resistans on the injectors. The one on the front cylinder read 15 Ohm, the other one (that is working) read 17 Ohm. Haynes says 16 Ohm at 20 degrees celcius, I don`t no the exact temprature in my garage, but probably around 18. No cables are destroyed and I have cleaned most of the connectors. Has anyone any tips or trix to share? Is the injector something that breaks? Never experienced that before.
have you checked the ohm's readings on the coils? check or swap them over to see if the miss goes to the other cylinder..
you have a spark on vertical cylinder plug? was plug wet with fuel if removed immediately after attempted start? try swapping plugs/new plugs, also check for sparkplug lead shorting out intermittently, Once you determine whether electrical or fuel then you can start to home in on the culprit.
Could check the earths on the coils and plug holes, had a miss fire on a civic once that was down to a rusty plug.
Spark is fine, it fires on both if I dribble som fuel down the front inlet when it is running, so it has to be fuel. I will take the injector out and see if I find anything wrong. It is probably a filter screen there. Maybe it is clogged up.
Not Ducati or bike related my 4 cylinder Mercury boat motor had a miss, went out the beginning of the year and she was perfect, I went out 3 weeks later and developed bad miss and wouldn't rev over 3k, I though oh fowled plug or one has gone down.. Got a new set of plugs and fitted them and still had the same issue even tho every cylinder had a spark. I found the missing cylinder on 3. My next thought was fuel, so removed injector on 3 it seemed fine so just swapped injector 2 for 3, the miss was still on 3 so Tested all the Ohm's on the caps, leads then the coil packs and all seemed fine Only one coil was down 0.1 on No 3.. I am not auto electrician!! I swap 2 for 3 and the miss moved to 2 , then swapped 2 for 1 again moved to 1... New coil pack it was fine. I was advised to replace all four but at 160ish plus vat i risked just one...
Sparks can be ok outside the engine, but fail inside due to coil-pack inadequacy. You say that the coils & plugs are ok but have you swapped them to see if the fault moves to the other cylinder?
I have not switched the coils, but it fires and runs fine if i dribble fuel down the inlet so i don't think spark is an issue.
