The timing specifications for a Honda SL125S from 1971 may vary slightly depending on factors such as regional variations and modifications made to the motorcycle over time.
To set the timing on your Honda SL125S after a rebuild, you will need a timing light and a service manual specific to your motorcycle model and year. The service manual will provide detailed instructions and specifications for the correct timing procedure.
Here are the general steps for setting the ignition timing:
Prepare the motorcycle: Ensure that the engine is in a good state of tune and that all necessary adjustments, such as valve clearance and carburetor synchronization, have been made.
Locate the timing marks: On the engine's rotor or flywheel, there will be timing marks or an index line. These marks are usually located on the left side of the engine and are used to align the ignition timing.
Connect the timing light: Connect the timing light to the motorcycle's battery and spark plug wire according to the manufacturer's instructions.
Start the engine: Start the engine and allow it to warm up to normal operating temperature.
Aim the timing light: Point the timing light at the timing marks on the rotor or flywheel. You should be able to see the timing marks clearly when the engine is running.
Check the timing: While the engine is running, use the timing light to check the position of the timing marks. The timing light will flash each time the spark plug fires, allowing you to observe the relationship between the marks and adjust as needed.
Adjust the timing: Refer to the service manual for the specific timing specifications for your motorcycle. Typically, you will need to adjust the stator plate or ignition points to align the timing marks correctly.
Recheck and fine-tune: After making adjustments, recheck the timing with the timing light. Continue adjusting as necessary until the timing marks align within the specified range.
It's important to note that the above steps are a general guideline, and the exact procedure and specifications may differ for your specific Honda SL125S model. Always refer to the service manual for accurate and model-specific instructions when performing timing adjustments.