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It's a standard battery and coil systemPoints 1-4 are arcing excessively - the spark is much the same as at the plug and it causes a misfire, which clears for a while when the points are cleaned.The condensers are new pattern DS parts; I've tried swapping them over with the 2-3 set and also returned the original (40 years old) one. Whilst you can convince yourself that there is a marginal difference, before long it's points 1-4 that are troubling.The LT resistance of the coil is 4.2 ohms (same as the other coil). I can't yet see how it can be caused by the HT side but nevertheless it has a resistance of 30.9k ohms (only 23.4k ohms for coil 2-3). The plug caps are 8.3k & 8.6k (4.3kx2 for plug caps 2-3 - which are a longer reach type).New set of NGK plugs.Any thoughts on what is causing the arcing would be most welcome
Thanks to all. I accept the condenser is the most likely culprit, and I'll check again. It's just that having tried three separate condensers, I was looking for another possibility.The plug caps could be renewed; at this stage I can't quite see how an issue on the HT side can cause a problem on the LT side - but maybe it can!
In THEORY it should not matter where on the points lt lead they are fitted and if you fitted an extra in parallel the total capacitance increases so should be better, i tried it on the 500 i sold Ted with 2 rover v8 ones at the coils and the bike did not like it so i disconnected them but as Ted noticed it was too much of a fiddle to remove them!