Maintenance And Adjustment
96
Position the motorcycle on level ground
and in an upright position. The
expansion tank can be viewed from the
right hand side of the motorcycle,
towards the rear of the engine.
Check the coolant level in the expansion
tank. The coolant level must be between
the maximum (top) and minimum
(bottom) marks. If the coolant is below
the minimum level, the coolant level
must be adjusted.
Coolant Level Adjustment
Warning
Do not remove the expansion tank or
radiator pressure cap when the engine
is hot. When the engine is hot, the
coolant inside the radiator will be hot
and also under pressure. Contact with
this hot, pressurised coolant will cause
scalds and skin damage.
Caution
If hard water is used in the cooling
system, it will cause scale accumulation
in the engine and radiator and
considerably reduce the efficiency of
the cooling system. Reduced cooling
system efficiency may cause the
engine to overheat and suffer severe
damage.
Note:
• If the coolant level is being checked
because the coolant has overheated,
also check the level in the radiator
and top up if necessary.
• In an emergency, distilled water
can be added to the cooling system.
However, the coolant must then be
drained and replenished with HD4X
Hybrid OAT coolant as soon as
possible.
Street Cup, Street Twin,
Street Scrambler, Bonneville T100
and Bonneville T120
Allow the engine to cool.
The expansion tank cap can be removed
from the left hand side of the
motorcycle, towards the rear of the
engine.
Remove the cap from the expansion
tank and add coolant mixture through
the filler opening until the level reaches
the MAX mark. Refit the cap.
Thruxton and Thruxton R
The expansion tank cap can be removed
from the right hand side of the
motorcycle, towards the rear of the
engine.
Remove the sprocket cover.
Remove the cap from the expansion
tank and add coolant mixture through
the filler opening until the level reaches
the maximum (top) mark.
Refit the cap. Refit the sprocket cover
to 9 Nm.
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