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« on: October 30, 2011, 09:50:22 AM »
Hi Matt,
This is what I found out,
"A black dry fluffy colored plug is caused by deposits from a carburetor that is running too rich (too much gas),or excessive idling on some engines.
Black smoke coming from the exhaust is a sign of a rich air/fuel mixture. The rich air/fuel mixture must be repaired before installing a new spark plug.
Common causes for a rich air/fuel mixture are:
dirty air filter.
air mixture screw or carburetor needs adjusting.
choke is sticking.
carburetor float height is out of adjustment or float is sticking open."
Just installing carb wont help, you need to adjust CO levels.
By looking your pictures, it looks like running too rich - either too much petrol OR less air.
LATERS