Hay Fred welcome to the forum, humm a couple of thing for you to check, have you checked the dash pot for oil? this is quite often over looked and you will be amazed at the problem a dry dash pot can cause... flat spots and misfires are common worth a check! the dash pot is on top of the carb! undo the black screw in cap and top up with a good dash pot oil! don't use 3in1 or light oil it will last about 2 seconds and make the car smoke...lol I use Penrite dash pot oil GGL9035X good stuff...at a push you can use engine oil but it's a little heavy really. The orange spark at the plugs could be a few things! what year is your car and what colour wire's go to the coil?
Let me know I can probable help!
Oz
Oz Cooper
Classic Mini Product Manager UK
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