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13. ENGINE PROBLEM DIAGNOSTIC
The engine doesn't start
The engine doesn't idle
The engine doesn't reach the maximum rpm Wrong carburetion
Engine revs up when idling
TIGHTENING TORQUE VALUE FOR ENGINE BOLTS AND SCREWS
HEAD SCREWS
HEAD NUTS
CLUTCH NUT
CRANKSHAFT NUT (IGNITION SIDE)
PROPELLER CENTRAL NUT (LEFT THREAD)
SPARK PLUG
CRANKCASE SCREW
INTAKE MANIFOLD LOCKING SCREWS
SILENCER LOCKING SCREWS
STANDARD TIGHTENING TORQUE VALUE
5MM BOLT AND NUT
6MM BOLT AND NUT
8MM BOLT AND NUT
10MM BOLT AND NUT
12MM BOLT AND NUT
CAUSE
Out of petrol
Petrol doesn't reach the carburetor Check the fuel system circuit
Old or wrong petrol
Flooded engine
Defective spark plug
Blackened or wet spark plug
Earth switching off cable
Spark plug hood wrong installed
Carburetor has problems
No spark
Dirty carburetor
Out-of-adjustment screws
Defective spark plug
The carburetor has problems
The reed valve has problems
Dirty air filter
Dirty exhaust system
Out-of-adjustment screws
Air through the gaskets
M
5
6
10
10
10
6
6
8
N.m
6
10
25
45
55
SOLUTION
Add petrol
Empty the tank and the fuel system circuit and replace the petrol.
Remove the spark plug, start the engine, dry or replace the spark
plug.
Replace it
Clean and dry the spark plug or replace it
Check the tightening
Check it
Clean and check it; eventually replace the diaphragm
Check the ignition, coil and wiring
Clean and check the carburetor
Calibrate the carburetor again
Replace it
Calibrate the carburetor
Clean and check it; eventually replace the diaphragm
Replace the reeds or the whole reed valve
Clean or replace it
Clean or replace the deadening material
Calibrate the carburetor
Replace the gaskets and seals
N.m
Kgf.m
7
0,7
11
1,1
55
5,5
40
4
40
4
20
2
8
0,8
8
0,8
15
1,5
Kgf.m
Lbf.ft
0,6
4,4
1
7,4
2,5
18,5
4,5
33,3
5,5
40,7
17
Lbf.ft
Locking compound
5,2
8,1
40,7
29,6
29,6
14,8
5,9
5,9
11,1
LOCTITE 243
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