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

[KeefyB]

Fuel tank breather partially blocked??

[phillc]

Originally Posted by KeefyB

Fuel tank breather partially blocked??

Now there's an idea........

I had this blocked once before and it caused this:

http://www.kapital-sales.co.uk/desmo...Tank%20001.jpg
http://www.kapital-sales.co.uk/desmo...Tank%20009.jpg

I'll check the breather pipe because I did notice this afternoon a "hissing" coming from around the fuel cap. I did think perhaps it was something I'd done in not putting it back together correctly after changing the filter.

Any thoughts on the best way to clean/clear the breather?

[KeefyB]

Cant remember how the breather is routed on the I.E bikes,but when my wife had a carbed SS,I cleaned out a blockage by pushing a lengh of 4mm electrical cable down it.

Oh yeah,I remember those pics.Incredible!

[phillc]

Originally Posted by KeefyB

Cant remember how the breather is routed on the I.E bikes,but when my wife had a carbed SS,I cleaned out a blockage by pushing a lengh of 4mm electrical cable down it.

OK, maybe I'll try a twisted piece of lock wire or similar. Thanks for that.

I should also mention that I spent some time this evening checking that the fuel line wasn't kinked anywhere, thus reducing the flow of fuel.

Any further ideas?

Had similar issues before on a 900SS was an HT cable breaking down under load, finally traced it by spraying water onto leads via a greenfly killer in the garage in the dark and seeing the break down, I know 'how those long winter evenings must fly by', but bl**dy found it eventually !!!

[phillc]

Originally Posted by DaveB916

Had similar issues before on a 900SS was an HT cable breaking down under load, finally traced it by spraying water onto leads via a greenfly killer in the garage in the dark and seeing the break down, I know 'how those long winter evenings must fly by', but bl**dy found it eventually !!!

Perhaps I'm being ignorant - very possible - but I don't quite understand. Please excuse me, but what is an "HT cable" and how did spraying water on it in the dark help you to see the break down?

HT cable is cable that goes on spark plug, you can see it arcing to heads or frame depending where the insulation is breaking down, hence it discharges there and no spark at plug = misfire tends to happen under load and more if damp.

[Jools]

Originally Posted by KeefyB

Cant remember how the breather is routed on the I.E bikes,but when my wife had a carbed SS,I cleaned out a blockage by pushing a lengh of 4mm electrical cable down it.

Oh yeah,I remember those pics.Incredible!

I dunno about SSie's either but on the ST the breather is a little round can about the size of a 10p piece and about half as deep with an air inlet sticking out the side. It's a one way valve and it sits on the bottom of the fuel pump assembly.

[skidlids]

how about getting it plugged into a diagnostic machine in case its a sensor of some kind.
The guys from MotoRapido were kind enough to plug theirs in to Dallas's bike on Monday at the trackday and it revealed a rpm sensor fault.

[Jools]

Originally Posted by skidlids

how about getting it plugged into a diagnostic machine in case its a sensor of some kind.
The guys from MotoRapido were kind enough to plug theirs in to Dallas's bike on Monday at the trackday and it revealed a rpm sensor fault.

Bugggerit...if I'd known they had one of those at the trackday