45
d. Loose spark plug – Tighten spark plug
ii. Spark Plug OK – Check Carburetor
4. Carburetor
i. Carburetor Defective
a. Blocked idle jet – Clean jet
b. Dirty float bowl – Clean bowl
c. Low fuel in bowl – Adjust bowl
ii. Carburetor OK
a. Engine overheated – Check & replace lubricating
oil
b. Air inlet system blocked or leaky – Remove
blockage or leak
KNOCKING SOUND IN CYLINDER
Causes
Solutions
1. Engine Overheating
Check & replace lubricating oil
2. Spark Plug Defective
Replace the spark plug
3. Ignition Timing Too Early
Adjust ignition timing
4. Carbon Build-Up
i. In Cylinder
Remove carbon build-up
ii. In Exhaust Pipe & Muffler
Remove carbon build-up