Here are my plugs after a full tune on my 71 750:
Valves- .002 intake .003 exhaust
Points- .015
Stock coils and new honda tec points, condenser and plate.
Hondaman transistor installed- plugs look like this with or without the ignition installed.
Plug caps are NGK 5kohm and are on tight.
4 to 1 exhaust (unknown brand)
K&N air filter in stock air box
Cleaned grounds and wires
Spark on all four plugs
Float bowl setting 23mm on all four and vent tubes are clear.
Timed spot on static and with light.
What else could I check to get the fowling to stop?
There is a slight backfire at idle. No color to exhaust.
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