Ducati backfire through exhaust on start up

**750sf** · 21st June 2009, 15:15

I have a ducati 89 900ss with the weber carb. When I start it it makes a hell of a bang through the exhaust. Its loud enough to get the AOS called out and is also embarrasing. Has anyone out there had a simalar problem with there ducati? Keen to find a solution.

**98tls** · 21st June 2009, 16:43

Had an 89 myself,the Webers a nasty thing though not necessarily the problem in this case.Might be something useful for ya here,http://au.wrs.yahoo.com/_ylt=A0oGkzH...ff=2%26p=26189 or hopefully someone else on here comes along with some useful info.

**CookMySock** · 21st June 2009, 17:52

My hyo 650 vtwin does the same. I was told not to touch the throttle AT ALL on cold starts. Full choke only - no throttle. Sometimes it will still give a wee pop, but not the hellava BOOM that you are talking about.

Steve

**wysper** · 21st June 2009, 17:58

My SV650 has done that on occasion too. I am not sure what causes it.
Doesn't do it every time, and hasn't done it for a few months now either.

I was thinking it might be fuel related?

**98tls** · 21st June 2009, 18:16

To be honest mate i would myself just log onto one of the many Duc forums,as with any brand specific forum the members are pretty clued up,with my one i had a few problems with both the carb and the electrics.I have no doubt many of the old hands on one of the Ducati forums could get you sorted double quick.

**CookMySock** · 21st June 2009, 18:20

My guess is it's the unburned fuel/air being ignited by the wasted spark when the exhaust valve is open. It's a fooken massive KA-POW thats for sure. I clear the area behind me on all cold starts.

Steve