pccapri Posted May 2, 2013 Report Posted May 2, 2013 My mk1 fiesta 950 keeps failing mot on emissions. I now have 10 days to sort them out or I pay for a 4th test! Its got a weber 32ich carb which im told is a direct replacement part. Ive tried adjusting the air/fuel mixture etc. But still kicks out too much fuel through the exhaust. Its a leaded head and im using redex additive. Not sure what else I can do. Hoping someone can point me in the right direction!
SmokeEm Posted May 2, 2013 Report Posted May 2, 2013 Why don't you take it to Eddie at Motest by the footy ground and get him to set it up. He would've sorted it the 1st time if you'd taken it there for the MOT? He is proper oldskool. Got a 105e
pccapri Posted May 2, 2013 Author Report Posted May 2, 2013 Thats who has it now. Hes just called to say it is choking up his machine. The way he made it sound was that he didnt know how to set it up.
katana Posted May 2, 2013 Report Posted May 2, 2013 Back to basics - you say the carb is a direct replacement but is it spec'd for that engine? Could be spec'd for something bigger - it could bolt on fine but be fuelling your ickle 950 like it was an 1100 or 1300? If the thing is not burning the fuel, its either TOO rich or its ignition related - either way it'd be running like crap!
pccapri Posted May 2, 2013 Author Report Posted May 2, 2013 Ive stripped the carb down now. Just going to look up on net to see what jets are supposed to be in. Does anyone know what there supposed to be?
SmokeEm Posted May 2, 2013 Report Posted May 2, 2013 http://www.triumphspitfire.com/jets.html#ich The jet sizes are listed here for a 34 ICH but they wouldn't be wildly different.
pccapri Posted May 2, 2013 Author Report Posted May 2, 2013 Excellent. Looks like none of the numbers match up or close to what I got. Now I need a diagram showing me which jet is called what!
SmokeEm Posted May 2, 2013 Report Posted May 2, 2013 What? Like this one? http://www.bitsofitaly.com/uploadedFiles/1275048119109-2233.gif
pccapri Posted May 2, 2013 Author Report Posted May 2, 2013 Cheers dave. Your doing your modding job very well! But doesnt help as all the jets have a lower rating than whats on my carb? So surely this just means its tje setting up of the carb that isnt right? The idle jet # is 40, the main jet # is 115 and the needle valve is 150
SmokeEm Posted May 2, 2013 Report Posted May 2, 2013 I'm no expert on jetting I'm afraid but possibly the idle jet is too large? w.AYNE would know?
pccapri Posted May 2, 2013 Author Report Posted May 2, 2013 Ah the air correction thingy has 170 on it when its supposed to be 150. But dont know what that is or what it does!
SmokeEm Posted May 2, 2013 Report Posted May 2, 2013 Oh the old air correction thingy. That'll be the thing that corrects the air that will
silverstreak Posted May 2, 2013 Report Posted May 2, 2013 is ya fiesta 1978 onwards if so it dont have to have a emission test just a visual test
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