Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Supersports: SS / SuperSport / Supersport 950 > Bike Lurching/Surging/Coughing Problem - Help!!

[Jools]

Errrrr...you weren't copying me were you?

I had exactly the symptoms you described on my ST2 for the whole of the first morning at Cadwell.

I changed the fuel pump, fuel filter, spark plugs...cleaned up the usual green connector suspects, drained the tank etc... almost exactly what you did.

I checked all the breathers as well, Still can't crack it

Pity, cos when it clears and pulls hard it's going like a train, better than I remember it ever going before.

thought about the TPS, but like your problem it seems to happen across the rev range not at a specific spot.

I'm gonna replace the battery next, because the battery is not holding it's charge. It's OK when you take it off charge, it'll start the bike no problem and it'll start the bike all day after that, but leave it overnight and the solenoid is clicking...I have a theory that if the battery or charging circuit is stopping the right voltage to flow across the TPS, or not providing enough voltage to the ECU then all sorts of crazy stuff could be happening to the fuelling or the sparks.

Don't know if this theory would explain why it's worse round right handers though

[phillc]

Originally Posted by Jools

Errrrr...you weren't copying me were you?

Well, I was hoping you'd reply with the solution ;-)

Originally Posted by Jools

Pity, cos when it clears and pulls hard it's going like a train, better than I remember it ever going before.

After I'd changed the plugs the engine somehow seemed to sound "crisper." Might have just been my imagination though.

Originally Posted by Jools

thought about the TPS, but like your problem it seems to happen across the rev range not at a specific spot.

I'll be honest, put my hand up and say I've tried changing the TPS (Yes I am that desperate) - quarter of a turn one way, quarter of a turn the other. No change to the overall problem, so the TPS is back where it started now.

Originally Posted by Jools

I'm gonna replace the battery next.....

My battery seems to be holding charge, as I don't have any starting problems. I did check that the connections were all fine though. Maybe I should try and find another battery just to check. Could be a busy day tomorrow....

Originally Posted by Jools

Don't know if this theory would explain why it's worse round right handers though

Mine happens mostly in a straight line, but then again I'm extremely tentative in the corners at the moment because I don't want to get thrown off the bloody thing!