Caution: The notch in the crank will show TDC for the Piston, the cams still need to be at TDC to prevent jumping. 50% chance if you only check the crank.
Stick in a high gear and turn the back wheel, taking the spark plug out will prevent it from rocking past TDC. On some models I know you can reinstall the inspection bolt without the washer on it to lock the engine at TDC, but don't forget to take it back out and reinstall with the washer or you'll damage the engine. Check a service manual for your exact bike, and if you're unsure get someone with more experience to help you out :-)
