1. Remove the spark plugs.
2. Turn the crankshaft until the timing marks on the flywheel and camshaft are aligned.
3. Loosen the 12 mm bolts holding the camshaft sprockets in place.
4. Using a suitable tool, rotate the camshaft sprockets until the timing marks on the sprockets are aligned with the marks on the cylinder head.
5. Tighten the camshaft sprocket bolts to the specified torque.
6. Reinstall the spark plugs.
Now the timing on your Suzuki VZ800 should be correctly adjusted.