Drive Chain - Honda CRF450X 2017 Owner's Manual & Competition Handbook

Drive Chain

Refer to Safety Precautions on page 25.
An endless (riveted master link) chain connects
the drive and driven sprockets. The O-ring chain
uses rubber between the side plates of the pin and
roller links to seal in the manufacturer-installed
lubricating grease and keep out moisture and dirt.
The service life of the chain depends on proper
lubrication and adjustment. Poor maintenance
can cause premature wear or damage to the drive
chain or sprockets.
Under severe usage, or when the motorcycle is
ridden in unusually dusty or muddy areas, more
frequent maintenance will be necessary.
Before servicing your drive chain, turn the
engine OFF, raise the rear wheel off the ground
by placing an optional workstand or equivalent
support under the engine and check that your
transmission is in neutral.
It is not necessary to remove or replace the drive
chain to perform the recommended service in
the Regular off-road Use Maintenance Schedule
(page 27).
96
Servicing Your Honda
17 CRF450X̲31MEY710.indb 96 17 CRF450X̲31MEY710.indb 96
Inspection
1. Stop the engine and raise the rear wheel off
the ground by placing an optional workstand
or equivalent support under the engine and
shift the transmission into neutral.
2. Check the drive chain slack (1) in the upper
drive chain run midway between the drive (2)
and driven sprockets (3). Drive chain slack
should allow the following vertical movement
by hand:
1 – 1 3/8 in (25 – 35 mm)
NOTICE
Excessive chain slack may allow the drive chain
to damage the engine cases.
(1)
(2)
(1) drive chain slack
(2) drive sprocket
(3) driven sprocket
If the chain is found to be slack in one segment
of its length and taut in another, this indicates
that some of the links are either worn, kinked or
binding. Kinking and binding can frequently be
eliminated by thorough cleaning and lubrication.
If the drive chain requires adjustment, procedure
is as follows:
Adjustment
1. Loosen the rear axle nut (1).
2. Loosen the chain adjuster lock nuts (2) and
turn the adjusting bolts (3) counterclockwise
to decrease slack or clockwise to increase
slack.
Align the index marks (4) of the axle plates
(5) with the same reference marks (6) on both
sides of the swingarm.
(4)
(6)
(1) rear axle nut
(2) chain adjuster lock nut
(3) adjusting bolt
3. Tighten the rear axle nut to the specified
(3)
torque:
94 lbf·ft (128 N·m, 13.1 kgf·m)
4. Recheck chain slack and adjust if necessary.
5. Turn the adjusting bolts counterclockwise until
they touch the axle plates lightly. Then tighten
the chain adjuster lock nuts to the specified
torque while holding the adjusting bolts with a
wrench.
20 lbf·ft (27 N·m, 2.8 kgf·m)
(5)
(2)
(3)
(1)
(4) index mark
(5) axle plate
(6) reference marks
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