So my 83 big red works, always fiddeling with "something" thought rebuild of carb = same issues.

1. New plug, runs all day. (next day wont start) with out a brand new plug!
2. Blows a little smoke when you start and even back fires from time to time, not much.

My mechanic is questioning why it runs if it has bad rings, bad rings = no workie!

So could it be the spark cable or a short or the coil ?

Some black and gas smell on the plug but my thought if its not getting "Hot" spark then it also could be causing the black plug?

No cleaning of the plug will return the machine to working shape, = new plug and runs all darn day.

Bad oil? Oil getting into motor?

I will make a video this time! you guys know your shit and I dont.