Well Brad - if it had been running good and the problem's junk in the carb, remove and disassemble the carb and give the parts a thorough cleaning. Reassemble with a new gasket kit - $25 or so - and you'll be good to go. (Keep in mind the SM carb is very simple and easy to rebuild...)
However BEFORE you get into the carb check your ignition timing! Could be the cam gear hub has broken and messed up the cam/spark timing. It's a common failure on the SM with live hydraulics. And it's consistent with the symptoms you describe. (Correct timing should be within a couple degrees of TDC.)
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Today's Featured Article - Measuring with Calipers - by Staff. The legs of inside calipers are curved outward at the extremities to facilitate measuring small holes, while outside caliper legs have a large curve inward to increase their capacity for large work. Firm-joint calipers are adjusted approximately by the hands and then set to the feel of the work by tapping them on a metal surface. It is a common practice when opening calipers by this means to tap the top of the joint. It is better, if possible, to tap the inside of the legs, as repeated blo
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