Shaun Parkin Posted July 2, 2015 Report Share Posted July 2, 2015 My Mk IV 1300 Spitfire has been running lovely but over the last couple of days is wanting to stall at any opportunity, running rich and eventually stalled and would not restart. I fiddled with the carbs and pressed the petrol feed pipe coming from the bottom of one float chamber, don't know what I did but it clicked and the car is running great again. Any one know what I did and what the problem could be? Thanks. Link to comment Share on other sites More sharing options...
AndyCrews Posted July 2, 2015 Report Share Posted July 2, 2015 My car sometimes does this. Its caused by one of the chokes sticking in the open position. Its cured by pushing the choke upwards until it clicks back into place. Andy Link to comment Share on other sites More sharing options...
Shaun Parkin Posted July 2, 2015 Author Report Share Posted July 2, 2015 Hi Andy Thanks for the reply, under the float chambers are little red 'button' type things, I'm assuming this is what clicked, is that what you are referring to. I'm more used to a '72 VW camper, only had the Spitty since Feb proving to be a bit of a diva!! Thanks Shaun Link to comment Share on other sites More sharing options...
Darren Groves Posted July 2, 2015 Report Share Posted July 2, 2015 Sounds like you have sticky jet(s), when you use the choke these are pulled down to richen the mixture if they don't return when you push the choke back in the carbs will be running rich and you'll get the symptoms you mention. If it keeps doing it you'll need to take them off and clean them and along with the jet assembly they slide up and down in. Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 3, 2015 Report Share Posted July 3, 2015 Had the same with an area car this week, its pretty common on SU also have carefull look at the awful set of levers and angles of rods that connect the cable pull to the jet dropping action, its been reported that the small flexible tube to the jet base is 3mm too long and reducing the length is known to improve things pete Link to comment Share on other sites More sharing options...
Shaun Parkin Posted July 4, 2015 Author Report Share Posted July 4, 2015 Thanks for the input, since clicking back into place the car is driving lovely again. Now I know what it could be I can remedy it. Thank you Shaun Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2015 Report Share Posted July 4, 2015 big elastic band may help !!! its the delights of SU design, if it doesnt stick or leak there's something wrong. appologies Im not an SU fan and there's two of the contrivances on my Mk2 T2000 Grrrr!!! Pete Link to comment Share on other sites More sharing options...
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