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It aint rocket science
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You are on the right track. 5 minutes of run time and black already, definite problem. Like mentioned it could have the wrong jet, broken mixture screw, high float level, leaking float valve or heavy float. Float levels could all be off seeing how mixture screws are all on the lean side. If anything on an older engine they would like to be a little on the richer side. OEM fuel pump or something else?

After resistance checking your wires it should then put the ign. system in the clear. One other item which could cause a black plug is low compression in that cylinder. From your description engine seems to run OK, but seeing how you are in for the long haul a compression test would be in order just to eliminate that possibility.

You might be able to get around a compression test by noting a similar RPM drop when running with plug wire removed compared to the other 3. The rich running cylinder might skew the results though.
 

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It aint rocket science
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3,970 Posts
Ign. and compression OK for the age.

Your pics dont clickey so we can't see nothing.

You do know to adjust float setting just touching the spring loaded float valve. If done otherwise with float resting on valve it will be rich.:)

Are float valves all the same style or has one or more been replaced.
 
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