Jordon T Posted July 20, 2011 Share Posted July 20, 2011 Hello There,Having rebuilt the engine and carburettors on my 1968 Triumph Vitesse 2 Litre Mk1, Everytime i even go near the choke Knob the car seems splutterr, and cough and dye!!!! However, the car seems to start nicely when i press the accelerator slightly. The car revs nicely and ticks over good at 700-800 rpm.What has caused this??Cheers Jordan T Link to comment Share on other sites More sharing options...
CharlieB Posted July 20, 2011 Share Posted July 20, 2011 Too rich a mixture? Link to comment Share on other sites More sharing options...
logicaluk Posted July 20, 2011 Share Posted July 20, 2011 I will be fettling my choke shortly ive got mk1 cds on my vitesse ( the one with the rotating bridge), mine had to be adjusted as they weren't level with each other i couldnt find any reference to where they should sit in the off position Andrew turner said the stop lever should be bent square,.It sounds like you maybe running rich,Have you tried adjusting the idle choke screw? to open the butterfly on the first part of the choke pull? im not sure what the gap should be I cant see it in the manuals but I probably missed it.Dan Link to comment Share on other sites More sharing options...
Jordon T Posted July 20, 2011 Author Share Posted July 20, 2011 I never thought it could be running rich! I thought it was running a bit lean as when lift the air piston slightly in the carb it starts to fumble and cut out, ?????Cheers, Jordan T Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 20, 2011 Share Posted July 20, 2011 fst idle on the choke needs to be around 1500+ rpmdoes the air piston drop whith a clunk...sounds like the jet needs centralizingPeter Link to comment Share on other sites More sharing options...
Nick Moore Posted July 20, 2011 Share Posted July 20, 2011 Not sure about Strombergs, but SUs have an adjustment so that when the choke is pulled out and the jet drops, the throttle is also cracked open to increase the idle. If this screw isn't set properly it won't idle while the choke is out, unless you hole the accelerator down slightly. Link to comment Share on other sites More sharing options...
mazfg Posted July 21, 2011 Share Posted July 21, 2011 http://www.pclarkson.plus.com/downloads/Buckeye%20Stromberg2.pdfPage 32 of 72, talks about setting the cam with a 5/16" drill bit whilst car at approx 1500rpm. This is for stromberg 175 CD's but parts of the set-up will apply to 150CD's Link to comment Share on other sites More sharing options...
Jordon T Posted July 21, 2011 Author Share Posted July 21, 2011 Thanks guys, Yes boith carbs fall with a clunk. However, one of them is slightly sticky when fully lifted to the top, I've tried and tried trying to get it any better but it still isnt brilliant, :( The spark plugs where all sutty and black, Its running rich! I've screwed the tunning nuts up to make it more lean, and the car reacts better to choke! However, its still a bit lumpy!I'm more used to Su carbs see, :'( Link to comment Share on other sites More sharing options...
Steve Cureton Posted July 21, 2011 Share Posted July 21, 2011 The fact it's improved suggests you're on the right tracks. It is possible your plugs are gunked up due to being over-rich so take it for a good run to burn them off. This will also be a good test for the mixture as the plugs should be a nice dark tan colour after a few miles of open-road driving. Do at least 10 miles on open roads and switch it off as soon after an open stretch as possible (eg pull into a layby) then check the plug colour. This will tell you a lot about the mixture, but won't be of so much value if the engine isn't thoroughly warmed or if driving through traffic. Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 21, 2011 Share Posted July 21, 2011 link to some good reading the buckeye site has brilliant photo's is for CD175 but principles are the same for 150worth a read up on a quite evening http://www.tssc.org.uk/index.php?option=com_fireboard&Itemid=55&func=view&id=44787&catid=219Peter Link to comment Share on other sites More sharing options...
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