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ENGLISH
TIGHTENING TORQUE VALUE for ENGINE BOLTS AND SCREWS
M
N.m
Kgf.m
Lbf.ft
Locking compound
HEAD SCREWS
6
12
1,2
8,8
HEAD NUTS
8
18
1,8
13,2
CLUTCH NUT
20
100
10
74
CRANKSHAFT NUT (IGNITION SIDE)
12
70
8
59
PROPELLER CENTRAL NUT (LEFT THREAD)
10
80
8
59
SPARK PLUG
20
2
14,8
CRANKCASE SCREW
6
8
0,8
5,9
COUNTERSHAFT NUT
12
60
6
44,2
INTAKE MANIFOLD LOCKING SCREWS
6
8
0,8
5,9
MUFFLER STUDS NUTS
8
18
1,8
13,2
LOCTITE 270
SILENCER LOCKING SCREWS
8
15
1,5
11,1
LOCTITE 243
MUFFLER LOCKING SCREWS
8
15
1,5
11,1
LOCTITE 243
STANDARD TIGHTENING TORQUE VALUE
N.m
Kgf.m
Lbf.ft
5MM BOLT AND NUT
6
0,6
4,44
6MM BOLT AND NUT
10
1
7,40
8MM BOLT AND NUT
25
2,5
18,50
10MM BOLT AND NUT
45
4,5
33,30
12MM BOLT AND NUT
55
5,5
40,70
13. ENGINE PROBLEM DIAGNOSTIC CAUSE
SOLUTION
The engine doesn't start
Out of petrol
Add petrol
Petrol doesn't reach the carburetor Check the fuel system circuit
Old or wrong petrol
Empty the tank and the fuel system circuit and replace the
petrol.
Flooded engine
Remove the spark plug, start the engine, dry or replace the
spark plug.
Defective spark plug
Replace it
Blackened or wet spark plug
Clean and dry the spark plug or replace it
Earth switching off cable
Check the tightening
Spark plug hood wrong installed
Check it
Carburetor has problems
Clean and check it; eventually replace the diaphragm
No spark
Check the ignition, coil and wiring
The engine doesn't idle
Dirty carburetor
Clean and check the carburetor
Out-of-adjustment screws
Calibrate the carburetor again
Defective spark plug
Replace it
The engine doesn't reach the maximum rpm Wrong carburetion
Calibrate the carburetor
The carburetor has problems
Clean and check it; eventually replace the diaphragm
The reed valve has problems
Replace the reeds or the whole reed valve
Dirty air filter
Clean or replace it
Dirty exhaust
Clean or replace the deadening material
Engine revs up when idling
Out-of-adjustment screws
Calibrate the carburetor
Air through the gaskets
Replace the gaskets and seals
