Tools Needed:
- Socket set
- Timing light
- Breaker bar
- Degree wheel or timing disc
- Screwdriver
- Feeler gauge
Procedure:
Step 1: Preparation
- Disconnect the spark plug lead and remove the ignition cover to access timing marks on the flywheel.
Step 2: Setting TDC (Top Dead Center)
- Insert a screwdriver or some tool that will not mark the piston into the spark plug hole.
- Gently turn the crankshaft (usually by using the flywheel nut or turning the kickstart assembly).
- Keep an eye on the inserted screwdriver or tool as you turn the crankshaft. When the piston reaches the highest point and starts to descend , you know that you're close to TDC.
- Continue turning the crankshaft slowly in the same direction until you observe that the screwdriver stops moving. This indicates that the piston is exactly at TDC.
- Once the piston is at TDC, stop turning the crankshaft.
Step 3: Alignment of Timing Marks
- Look for timing marks on the engine flywheel and the cylinder head or casing.
- Align the timing mark on the flywheel with the reference mark on the cylinder head. This ensures that the crankshaft is in the proper position.
- Some 110 cc engines may use a degree wheel or timing disc instead of standard timing marks. In that case, align the timing mark on the wheel or disc with the top dead center (0degree mark) reference.
- If you observe that the timing marks on the engine flywheel and head align, skip to Step 6. If the marks do not match, proceed to the next step.
Step 4: Adjusting Timing Chain/Gear/Belt
- If the timing marks are not aligned, it's necessary to adjust the timing chain, gears, or belt to bring the marks into alignment.
- For a timing chain/gear, you may need to loosen the chain/gear adjustment bolt, reposition the chain or gear, and then re-tighten the bolt.
- For a timing belt, it might require removing the belt cover, loosening the tensioner, removing and replacing the belt properly, and reattaching the tensioner.
Step 5: Recheck Alignment
- After adjusting the timing chain, gear, or belt, double-check the alignment of timing marks on the flywheel and the engine head. Ensure that they precisely match.
Step 6: Adjustment of Valve Clearance (if applicable)
- Some 110 cc engines may require valve clearance adjustment. If applicable, use a feeler gauge to check and adjust the gap between the valve stem and the cam lobe as specified by the manufacturer.
- Adjust valve clearance using the screw adjustment (if present).
Step 7: Reattach Components
- Reinstall the ignition cover and reconnect the spark plug lead.
Step 8: Final Check
- Double-check all timing marks and valve clearance settings one more time to ensure that everything is properly set.
Once the timing is set, you can confidently reattach the remaining engine components and start the engine. Remember that timing specifications can vary depending on the specific 110cc engine model, so always refer to the engine manual or any provided service data for the exact timing settings and procedure for your engine.
