timmsy Posted October 1, 2013 Share Posted October 1, 2013 Hi all I have a 1500 1978 spitfire and recently it failed its mot on the emissions the mechanic said that the carbs needed adjusting another mechanic who helps me out told me that he couldn't adjust the carbs as the are done through the dash pots with a special tool I was just wondering if this is true as I thought I read somewhere that it's done via a screw on the side of the carb Sorry I don't know what sort of carbs they are Any advise would appreciated Quote Link to comment Share on other sites More sharing options...
gfiandy Posted October 1, 2013 Share Posted October 1, 2013 We can't really help without knowing what carbs you have. Could you take a picture of it?Normally you would have HS4 SU carbs and they are adjusted by the jet screw which is on the bottom of the carb. However it could be other things that are causing the problem such as wear in the jet, needle or spindles.Regards,Andrew Quote Link to comment Share on other sites More sharing options...
Rich_s Posted October 1, 2013 Share Posted October 1, 2013 if they are std then they are hs4's, adjusting mixture is easy as said above - just a screw on the bottom of the carb body to wind the jet in a bit.i had mine fail last year on emissions and one side running too rich, turned out to be the choke was not shutting off properly!if you can get a pic up then should be able to help more as andrew says. generally quite simple to adjust though.rich Quote Link to comment Share on other sites More sharing options...
rotoflex Posted October 1, 2013 Share Posted October 1, 2013 Over here, a 1978 Spitfire would have come with CDSE Strombergs. Those are adjusted from the top with a tool: Quote Link to comment Share on other sites More sharing options...
junkuser Posted October 1, 2013 Share Posted October 1, 2013 That does sound like the situation Bill. Quote Link to comment Share on other sites More sharing options...
timmsy Posted October 2, 2013 Author Share Posted October 2, 2013 Thanks guys I tried to take a pic but it was always too big to fit on here I think my guy may be confusing the storm bergs carbs as everything else on my car is original so presume the carbs are too ie hs4 and I also checked the choke return rich_s and it doesn't seem to be closing down properly and maybe just that simple hope so thanks guys for your thoughts Cheers Quote Link to comment Share on other sites More sharing options...
MadMitch82 Posted October 2, 2013 Share Posted October 2, 2013 stick the photo on photobucket or similar and post a link here, no size issues then :) Quote Link to comment Share on other sites More sharing options...
rotoflex Posted October 2, 2013 Share Posted October 2, 2013 US Spitfires came with one or two Stromberg CDSE carbs.Here isa a single Stromberg CD150 carb. It will adjust through the top with that tool:http://www.triumphexperience.com/phile/8/2072/IMG_1980_2.JPGSU HS4 carbs look like this (notice the aluminum tops are taller):http://www.vtr.org/maintain/spit-carbs/suf1.jpg Quote Link to comment Share on other sites More sharing options...
timmsy Posted October 2, 2013 Author Share Posted October 2, 2013 I have the SU HS4 carbs and I believe they are straight forward to adjust Thanks to you all for your advice Quote Link to comment Share on other sites More sharing options...
Sheepy Posted October 2, 2013 Share Posted October 2, 2013 Don't forget to synchronise them also! Quote Link to comment Share on other sites More sharing options...
BrendanD Posted October 2, 2013 Share Posted October 2, 2013 Thought this was a post about diet.... ;D Quote Link to comment Share on other sites More sharing options...
Sheepy Posted October 2, 2013 Share Posted October 2, 2013 BrendanD wrote:Thought this was a post about diet.... ;DOoh you are naughty! But I like you! ;) Quote Link to comment Share on other sites More sharing options...
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