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t5 vespa 172 kit
Posted: Fri Jan 04, 2013 2:09 pm
by mick fletcher
all of a sudden started back firerin changed plug looked in carb any ideas
Re: t5 vespa 172 kit
Posted: Fri Jan 04, 2013 3:39 pm
by cezeta
if you de exelerate then open the throttle does it back fire then?
Re: t5 vespa 172 kit
Posted: Fri Jan 04, 2013 4:55 pm
by Badwolfli225
Woodruff key?
Re: t5 vespa 172 kit
Posted: Sat Jan 05, 2013 12:12 pm
by cit205
Water in CDI ? Take the rubber boot off and have a look , if it's wet don't use wd40 just dry it out. Spraying wd40 everywhere can cause shorts too.
Re: t5 vespa 172 kit
Posted: Sat Jan 05, 2013 5:28 pm
by cezeta
my back firing was first a drive side seal faulure air leak, then a carb rattling loose air leak, then an exhaust downpipe crack air leak.
3 separate problems with similar symptoms.