Do not, repeat NOt turn the crankshaft AT ALL. If there's dirt in the engine, you may score the cylinder or piston walls, ruining the engine. Flush the carb out with clean fuel. Take it off and flush the intake port. Flush through the exhaust port. Carefully take the cylinder head off and flush the combustion chamber. Take the backplate off and the flush the crankcase. Now, slowly and carefully turn the crankshaft just a little. If you feel ANY grittiness, STOP!!! You'll have to take the cyliner liner and piston/connecting rod assembly out and flush the crankshaft journal. If there's no grittiness, turn the crankshaft completely a few times. If it's smooth, the engine is ok to reassemble, restart, and retune.

Some will recommend isopropyl alcohol. This contains water and may rust the steel parts in the engine. Others will recommend various methods and cleaning solutions. I've found this to work well. You won't use as much fuel as you might think, maybe a cup or two, and it won't hurt the engine.

Dr.1