Focer font of knowledge - cage spark plugs

[coffee]

take the plugs out ,turn it over a few times and most of the crap will come out ,then stick a plug in the ht lead ,turn it over and see if you've got a decent spark,if you have it's probably a petrol problem or some crap out of the tank collected around the pick up in the tank they were a bastard for that back in the day,especially if you've a tendency to run it low on fuel.