There should be a arrow marks pointing straight up on the cylinder head and cam sprocket. Once you have the timing marks set, remove the camshaft sprocket bolt and slowly rotate the camshaft sprocket until the marks line up. When the marks are aligned, tighten the camshaft sprocket bolt and recheck the timing marks to make sure they're still aligned.
Here's a step-by-step guide to help you accurately set cam timing on your Honda 50cc motorcycle:
1. Preparation
- Gather the necessary tools and materials. This includes a piston stop, feeler gauge, socket wrench, and spark plug wrench.
- Remove the spark plug and insert the piston stop into the spark plug hole.
- Rotate the crankshaft until the piston comes into contact with the piston stop. This ensures the piston is at the top of its stroke.
2. Reference Marks
- While the crankshaft is locked, locate the reference marks on the camshaft sprocket and the cylinder head.
- Use a sharpie to mark these points. Typically, there are three marks on the cylinder head and one on the cam sprocket.
3. Removing the Camshaft Sprocket Bolt
- Use the socket wrench to loosen and remove the camshaft sprocket bolt.
- Be careful not to drop the bolt.
4. Adjusting Camshaft Sprocket Position
- Slowly rotate the camshaft sprocket until the reference marks align.
- Ensure that all the marks are in a straight line.
5. Tightening Camshaft Sprocket Bolt
- Once the cam timing is set correctly, tighten the camshaft sprocket bolt securely.
- Use the socket wrench to apply the appropriate torque as specified in your motorcycle's manual.
6. Re-checking the Timing Marks
- After tightening the bolt, re-check the alignment of the reference marks.
- Ensure they are still in line to confirm the cam timing has not shifted.
7. Piston Stop Removal and Spark Plug Installation
- Remove the piston stop from the spark plug hole.
- Reinstall the spark plug and hand-tighten it.
8. Final Checks and Adjustments
- Ensure all bolts and screws related to cam timing are tightened securely.
- Double-check the reference marks to ensure the cam timing is correct.
9. Starting the Motorcycle
- Start the motorcycle and let it run for a few minutes.
- Listen for any unusual noises or vibrations that may indicate a cam timing issue.
Remember that setting cam timing requires precision, so it's important to follow these steps carefully. Proper cam timing ensures the optimal functioning of your Honda 50cc motorcycle's engine. If you're unsure or uncomfortable with the process, it's best to consult a trusted mechanic or follow the instructions provided in your motorcycle's service manual.
