Intake Valve Opens: 15° BTDC (Before Top Dead Center)
Intake Valve Closes: 40° ABDC (After Bottom Dead Center)
Exhaust Valve Opens: 45° BBDC (Before Bottom Dead Center)
Exhaust Valve Closes: 10° ATDC (After Top Dead Center)
It's important to note that these timing values are approximate and may vary slightly from engine to engine. Always refer to the service manual for your specific model for exact timing specifications.