Thanks ZXoltan! posted by TyTyIsFly27 on May 10, 2015 at 12:50 PM
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if you remove all of the oil core plugs (easy since you already have them tapped) as well as all four of the jets. Turn the engine upside down and clean out the passages that way, so the stuff goes out the top, rather than deeper inside. I suggest you block up the wheels on one end of the engine stand so the carb cleaner flows out the other side while you are brushing it.
Good luck. Be sure to post pics of all the crud you extract ;-)