Honda XL125LK, Owner'S Manual

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3-9
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MAINTENANCE
SECONDARY AIR SUPPLY SYSTEM (XR125LK/LEK)
• The secondary air supply system introduces filtered air into exhaust gases in the exhaust port. The
secondary air is drawn into the exhaust port whenever there is negative pressure pulse in the exhaust
system. This charged secondary air promotes burning of the unburned exhaust gases and changes a
considerable amount of hydrocarbons and carbon monoxide into relatively harmless carbon dioxide and
water.
If the hoses show
any signs of heat
damage, inspect
the PAIR check
valve in the PAIR
reed valve cover for
damage.
Check the PAIR (pulse secondary air injection) hoses
between the air cleaner sub filter [1], PAIR control valve
[2] and cylinder head cover for deterioration, damage or
loose connections. Make sure that the hoses are not
cracked.
Check the PAIR hoses [1] between the air cleaner sub
filter and air inlet cover for deterioration, damage or
loose connections.
Make sure that the hoses are not kinked, pinched or
cracked.
Check the vacuum hose [2] between the PAIR control
valve and carburetor insulator for deterioration, damage
or loose connections.
Make sure that the hoses are not kinked, pinched or
cracked.
DRIVE CHAIN
DRIVE CHAIN SLACK INSPECTION
Turn off the engine, support the motorcycle on its
sidestand and shift the transmission into neutral.
Check the slack in the drive chain lower run midway
between the sprockets.
[1] [2]
[1]
[2]
CHAIN SLACK: 20 – 30 mm (0.8 – 1.2 in)
20 – 30 mm
(0.8 – 1.2 in)