29-08-17, 08:58 PM
It maybe at tickover, but a crack in the plug cap may not show up until higher rpm or under load.
If you swap leads and the fault follows it's electrical - a simple and easy tests. Same for removing the plug and looking at it. As every Haynes manual used to point out, you could tell the mixture by the spark plug colour. Block jet or air leak = weak mixture . Electrical fault means unburned fuel.
I'd start with stuff like that before pulling the carbs.
If you swap leads and the fault follows it's electrical - a simple and easy tests. Same for removing the plug and looking at it. As every Haynes manual used to point out, you could tell the mixture by the spark plug colour. Block jet or air leak = weak mixture . Electrical fault means unburned fuel.
I'd start with stuff like that before pulling the carbs.