Ducati 851 no sparking

motolaco

Hi all. Iam new owner of Ducati 851 1990 Superbike.
I bought bike from private collection and old owner told me that befor stop it was fully running bike.

But of cource i bring bike home and it is not spark on any spark plug.
I read some threads here about no sparking and i checked these....

Both position sensors SEN8T i put out clean and check resistance....both arround 0,7kohm so it looks ok...i chcecked if they works according this video https://www.youtube.com/watch?v=ct8tiy6d68A&t=5s

and it works both of them. Both sensor are powered arround 0,5V, i do not know if these are right value.

Voltage to both of coils are ok, neutral light is showing, fuel pomp is working, rellays looks working, ON/OFF switch is working, both coils has the same resistance....

When i starting bike is no spark at all or for very short period very poor spark, but when i release start button sometime it flash one or two nice sparks...but not during starting....

One thing when i bring bike home, i clean it by water and when i disconnect plugs for position sensors they were full of water, so i clean all plugs and put bike to heated room but nothing...

Thanks

griff851

could be a number of things unfortunately, including a flywheel about to fall off. First off KISS. (Keep it simple stupid), check plugs on things like ECU to make sure they are engaged properly and not all corroded. Easy job. Then check the kill switch, they can sometimes give you hassles. Could be the ecu, if you pull the cover off, a black burn mark pretty much says it all.
Be patient and methodical you'll find the issue.

motolaco

So yesterday i found problem.
I measure all wires, plugs, pins.....but solution is simple... previous owner change one relay R47, of course it fit there but was switching different pins! not right model! Crazy.
Now is question if ECU will be not dameged due to different voltage to pins from relay..

So now one cylinder is sparking nice, second not....yesterday i had no more time for investigating..