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ENGINE
SPARK PLUG IMAGES AND ANALYSIS
Colour: 1. Gray/ 2. Light brown
Analysis: Engine management ok
Colour: 3. Matt black/ 4. Velvety coating
Analysis: Fuel/ air mixture wrong. Too much fuel!
Solution: Fuel/ air mixture need to adjust.
How to adjust see page 21.
Colour: 5. Oily soot/ 6. Oil coal
Analysis: Too much oil.
Solution: Check lubrication system.
Check piston rings.
SPARK PLUG REPLACEMENT
1. Follow the instructions on page 27.
2. Reassemble in reverse order.
RECOMMENDED SPARK PLUG TYPES:
CYLINDER PRESSURE INSPECTION
NOTE
The pressure inspection should be made when the engine is
warm.
1. Warm up the engine for several minutes.
2. Stop the engine, remove the spark plug and insert a
pressure gauge (1).
3. Turn choke valve to its full open position.
4. Set throttle handle to its full open position and start the
engine.
5. Start the engine till reading of pressure gauge.
Standard value: 6-8 bar
Allowable limit: 5.5 bar
NOTE
1. Check the following items if the compression pressure is too
low.
•
If the cylinder head gasket is damaged
•
The wear or damage of piston ring
•
The wear of piston and cylinder
NGK/BR8ES
1
3
5
28
2
4
6
2
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