geoff121 Posted July 24, 2015 Report Share Posted July 24, 2015 Hi, I have a 1966 Herald convertible 1200 with a Solex B30 carb and it runs really rough, missing etc, up to 1500 rpm. I have checked everything I can think of. I have fitted a re-conned carb from The Carb Hospital, whole new ignition system and even checked the compression pressure which was very high, so fitted a re-conned head which bought the pressure down but though this has made the over 1500rpm much better below this it still runs rough. I have check the cam timing by bringing No1 to TDC on the firing stroke and both valves are rocking, is this the right way to check? This is driving me mad, not to mention the money side, and makes the car pretty un-driveable, I will be very grateful for any ideas. Thanks, Geoff 1 Link to comment Share on other sites More sharing options...
Roger Posted July 24, 2015 Report Share Posted July 24, 2015 Hi Geoff, What kind of "new ignition system" did you fit? Might be worth to double check the ignition timing? Regarding ignition systems there are some poor quality items on the market, like crappy rotor arms etc. Just a thought... Regards, Roger 1 Link to comment Share on other sites More sharing options...
geoff121 Posted July 24, 2015 Author Report Share Posted July 24, 2015 Hi simonbbc electronic, but it is on a points dibby at the moment as it is easier to time statically . the timing has been checked by men and a friend who is a retired motor engineer. You are right, there is a lot of crap on the market these days, mostly from China. Cheers, Geoff Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 24, 2015 Report Share Posted July 24, 2015 To check cam timing with the tappet gaps you set 7/8 in on the rock /balance , inlet opens and exhaust is closing, Now set 1/2 tappets to 0.060" Then turn crank to number one firing stroke TDC check the gaps on 1/2 doesnt matter what the gap is but both should be the same pete 1 Link to comment Share on other sites More sharing options...
geoff121 Posted July 24, 2015 Author Report Share Posted July 24, 2015 OK, thanks for that Pete. It will give me something to do in the morning. Cheers, Geoff Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 24, 2015 Report Share Posted July 24, 2015 some manuals spell this out differently but this will give you a result pete Link to comment Share on other sites More sharing options...
geoff121 Posted August 20, 2015 Author Report Share Posted August 20, 2015 Hi Pete & others who helped, The Herald is now running beautifully, a combination of too much compression, a totally knackered "re-conned" carb from The Carb Hospital and a fuel pump pushing out far too much petrol. All running great and I cannot stop driving her! Many thanks for all the replies, Geoff Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 20, 2015 Report Share Posted August 20, 2015 great its now OK , now the smile is returning next time try the carburetor exchange , happen to be close to me they are in leighton buzzard and do lots of work putting right what many other companies have got quite wrong, small place with lots of experience old time rules . do everything from a combine harvester to triple body mercs. http://www.carbex.demon.co.uk/ 1 Link to comment Share on other sites More sharing options...
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