I would measure the resistance of the plug leads. Good suppression ones when new are around 1.5-2K ohm, I bin any that are 5K or more.
I have measured many old ones where the resistance was infinite on my meter, this is not surprising- as cheap ones are just carbon impregnated string in the middle (not wire). OK when new but many die in 4 or 5 years.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.
