Hisun HS500 Owner's Manual page 167

8-64 Periodic Maintenance and Adjustment
S/N Problems
5 Engine cannot start.
Cylinder and cylinder
6
head
7
Piston and piston rings
Valve, camshaft and
8
crankshaft
Solutions
5. Check if the oil circuit is working properly.
6. Check if the exhaust system is blocked.
1. Check if the spark plug is loose.
2. Check if the cylinder head or cylinder body is loose.
3. Check if the cylinder head gasket is broken.
4. Check if the cylinder gasket is broken.
5. Check if the cylinder body is worn, damaged or seized.
1. Check for an improperly installed piston ring.
2. Check if the piston ring is worn or broken.
3. Check if the piston ring is seized.
4. Check if the piston is seized or damaged.
1. Check for an Improperly sealed valve.
2. Check for improperly connected valve and valve seat.
3. Check if the valve timing is improper.
4. Check if the valve spring is broken.
5. Check if the camshaft is seized.