What is the mark for top dead center on a motorcycle
1 Answers
The mark for top dead center on a motorcycle is a 'T' letter on the magneto rotor, with a "" engraved line next to it. There is a mark on the engine case or an inspection hole on the case cover. Rotate the magneto in the direction of engine operation, align the 'T' point engraved line on the magneto rotor with the mark, and the piston will be at top dead center. The top dead center of the piston is determined by aligning the magneto. However, in a four-stroke engine's working cycle, there are two top dead centers, and the valves can only be adjusted at the compression top dead center. At this time, you can observe the valve rocker arms. After the intake valve rocker arm closes, align the magneto engraved line with the mark, and when the valve rocker arms are in a relaxed state and do not move when the magneto rocker is gently shaken, it is the compression top dead center, and the valves can be adjusted at this time. If the valve clearance is tight when the 'T' point engraved line on the magneto is aligned, and the valve rocker arms move when the magneto is gently shaken, it is not the compression top dead center, and the valves cannot be adjusted at this time. Rotate the magneto one more turn and realign the 'T' point engraved line. When the valve rocker arms are in a relaxed state, it is the compression top dead center, and only then can the valves be adjusted.
