I have always encouraged everyone to do it by themselves, and to use their brains when dismantling. Just like when aligning, when removing the camshaft, first align the T point, and then look at the position of the camshaft. If there is no obvious mark, make a mark on each one by yourself, and align the T point when installing it. The mark of the camshaft is correct.
First, check whether the timing adjustment hole is on the left or right side of the engine. Open the large screw cover and use the sleeve to rotate the crankshaft. There is also a small screw cover on it, which is used to align the T point. Rotate the crankshaft, look in from the small screw cap, slow down when you see two vertical channels on the Ci motor (note) and immediately see another vertical channel and an F, (for the ignition advance) don't worry, in Turn, see T a finger apart, then stop. Align the vertical channel on the left of the T with the small cut on the box. Remove the mouth of the left cylinder and try it with a screwdriver to see if the piston is at top dead center. If there is no accident, it should be there, and then the piston is at the top dead center, and then the camshaft is installed.
Reinstall the camshaft and see what marks are on the chainring on the camshaft. It should have EX and IN. EX means exhaust and IN means intake. The upper intake camshaft is horizontal with the IN side rail, and the top exhaust camshaft is horizontal with the EX side rail.
If you can't see anything, just mark it as nothing, and don't look at the T-spot. First turn the piston of the left cylinder to the top dead center, and hold the screwdriver vertically to prevent it from accidentally jamming. The camshaft shoulder of one cylinder intake is placed nearly horizontally towards the carburetor. The exhaust camshaft shoulders are placed almost horizontally towards the exhaust port. One cylinder is right for the other, because it's all on the same shaft. At this time, the intake and exhaust valves should be closed, and the camshaft should not feel the pressure valve. When tightening, the bolts should be tightened evenly. This installation may require 1 to 2 teeth, don't be afraid, test the car first.
Before the test drive, you must manually rotate the crankshaft. If the crankshaft is stuck, the timing may not be correct. If it is smooth, you can take a taxi. Start the car little by little. If there is no abnormal noise, you can take a taxi. . After starting the car, judge whether the ignition is timing according to whether you love the car and whether it is strong.
