How do you time gy6?

To time a GY6 engine, first, ensure the engine is at the top dead center (TDC) by aligning the TDC mark on the flywheel with the mark on the engine casing. Next, remove the timing cover and inspect the timing marks on the camshaft and the engine case. The camshaft mark should align with the mark on the case when the engine is at TDC. If the marks do not align, adjust the timing by repositioning the camshaft sprocket as necessary and recheck the alignment before reassembling.