May 16, 201016 yr Author Thanks to everyone who contributed. I have now done 2 club trials and the pre 65 2 day - all on 1 plug. A BPR5ES. I did get a supply of BP4ES (equivalent) plugs but never had to use them, as I try only to change one thing at a time. The solution, as jon v8 suggested, was ignition - new coil and HT lead. Now runs really well, and the carb adjusters from Billet Parts makes it so much easier. Thanks again Ross
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