GPX 250r TSE, Maintenance Manual

Page: 92 / 104

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ENGINE TIGHTENING TORQUE TABLE
The engine tightening torque table is as follows:
No Applicable parts TORQUE VALUE
1 Cylinder head nut M8 28-32N.m
2 Cylinder head boltM6 10-15N.m
3 Timing sprocket 10-15N.m
4 Clutch tightening nut 40-50N.m
5 Magneto rotor bolt 65-71N.m
6 Valve cover 12-18N.m
7 box bolt 10-15N.m
TROUBLESHOOTING
If the engine wants to be operated normally, it should meet the following four requirements:
1. Good fuel: There is a certain ratio of combustible mixture in the cylinder.
2. Good spark: The spark plug can emit a strong spark at the specified time.
3. Enough compression: There is enough compression pressure in the cylinder.
4. Valve timing: correct valve opening time.
After the engine malfunctions, you can focus on the above four aspects to start, check, analyse the
cause of the malfunction, and eliminate it
FAULTS Inspection Method Results Possible Cause
The engine cannot be
started or difficult to
start
Check whether the
fuel flows into the
carburettor
Fuel does not flow
into the
carburettor
No gasoline in the
fuel tank
Blocked tubing from
the fuel tank to the
Carburettor
Fuel flows into the
carburettor
The float in the
Carburettor is stuck
The vent on the fuel
tank cap is blocked
Remove the spark
plug to test the spark
Weak sparks or no
sparks at all
Spark plug failure
The spark plug is not
clean
Electronic ignition is
malfunctioning
The magneto is faulty
Good sparks
Bad wiring, broken
High-voltage cable is
open or short-
circuited
Ignition coil is open