Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Supersports: SS / SuperSport / Supersport 950 > Backfire & poor running

[crash]

Help.

Rode to the Ally Pally show today, and my 1993 900ss (carb model obviously) was backfiring all over the place (on the over-run, and also on a neutral throttle at low revs).

I have never suffered this problem before. Also, low speed running is very rough, and she will barely tick-over at idle. Every time I stop at lights and pull the clutch in - it stalls.

Anyone got any clues please?

[900SL Pete]

A mate of mine has a 900 ss and it did the same once and then nothing for ages and then it did the same again. He found the problem to be his fuel breather pipe filter was blocked. Simple but frustrating. Take it out of the line and blow through it. It should blow through free if not its blocked.
It creates a vacuum i suppose, which stops the fuel being pumpped properly!
May be the same.

Other wise can't help.

[Redruth]

So, what is the show like and are Augusta there?

[crash]

Originally posted by Redruth
So, what is the show like and are Augusta there?

Augusta were not there directly, but there were a few tasty MV's in the "Italian" exhibition section (but only one Duke - a fairly standard 998s)

Show was very busy - go on a weekday if you get the chance.
Dave.

[crash]

Originally posted by 900SL Pete
A mate of mine has a 900 ss and it did the same once and then nothing for ages and then it did the same again. He found the problem to be his fuel breather pipe filter was blocked. Simple but frustrating. Take it out of the line and blow through it. It should blow through free if not its blocked.
It creates a vacuum i suppose, which stops the fuel being pumpped properly!
May be the same.

Other wise can't help.

I nailed it all the way down the A1(M) from Stevenage to the North Circular, at speeds well over the ton. Fuel starvation would have showed up then wouldn't it?

Thx anyway.
Cheers
Dave.

[FiscusFish]

Carb Icing.

Felt like it wanted to cut out or a spark plug had gone bad? Fairly nippy out but not freezing and a bit dampish? Bike felt OK with throttle wide open?

Slkoline Pro FST or other such stuff.

Darren

[monstermob 998]

thats exactly what my 600ss does in these conditions goes really well when its being throttled hard but runs poor at lower revs and back fires on the over run -sounds great--i changed to ultimate unleaded and all but alleviated the problem except in extreme cold conditions - went one stage further and added FST and problem solved!! also experienced the low tickover and stalling in really cold conditions

[monstermob 998]

i take it that the bike hasnt got carb warmers?not sure what year ducati started to fit them

[Iconic944ss]

Carb kit became available in 1992 but was not fitted as standard until 1997.

Sadly the Mikuni Carbs are well known for icing - tank vent is still worth checking out as well.

Frank

[Edited on 31-1-2005 by Iconic944ss]

[FiscusFish]

I've got carb warmers fitted to my bike but they're as much use as a chocolate teapot...

Darren