Hi all In the last 12 months ive had a problem with my 2005 GT 125 that occurs every 3-5 months. Odd i know! Its so odd that even my Vespa garage are perplexed. In short... Start vespa, idles fine, take off, after about a minute it idles rough and feels as if its going stall. I turn the throttle, it revs and then before it even takes off it sort of splutters and doesnt move. I turn the throttle again, it revs and then splutters and doesn't move and sounds like its going to stall. It has happened 3-4 times this year. Each time I have had the jets and carb cleaned just to make sure but it reoccurs every few months. I recently had it fully serviced and had the diaphragm replaced. The recovery people that have come to save me have all stated it seems like its over fuelling which doesn't make sense as its not a daily or weekly issue. Every time this has occured it has been towed to the garage but by the time it gets there it works! So tonight i left it sitting there for an hour and then started it and it worked. Granted it semi spluttered and slightly struggled during my ride home but half way home it was back to normal and working fine. My conclusion is that its definitely a fuel issue, as leaving it to settle for an hour sorts the issue but why is it a monthly fault as opposed to a daily or weekly fault? Could it be that im turning the throttle too much when i start it and therefore flooding the engine? Any ideas????
Have you changed the fuel tap at all? Could be a sticky diaphram in there. Or maybe a small pin hole in the vacuum pipe that closes up again when the engine gets it warm? I hate niggly problems like these, so difficult to put your finger on the cause.
when my bike gets low on petrol it some times splutters to a halt , fill it with petrol ,but it wont re start ive left it over night a nd it starts straight awsy, turned out to be the fuel tap leaked air in so cocking up the vacuum
