Join Date: Nov 2007
Location: Oregon, Chile, Alberta, Texas
Dry fouling means that the plug tip is coated with a black fluffy and sooty carbon that is completely dry. That is always from gasoline fouling, which is the result of more fuel than the incoming air will support for clean combustion.
The advice you got on setting your valve lash is good. However, I would pull the coil and have it tested to be sure it is not breaking down under load.
A weak coil will not generate enough spark to completely ignite the fuel mixture at the proper time, and will result in dry fouling. It is like running with severely retarded timing, the fuel ignites so late that it just soots the works. A coil going bad will also generally start to fail completely after it has run a while and starts to build heat load.
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