Honda CRF250X 2006, Owner'S Manual & Competition Handbook

Page: 98 / 180

94
Servicing Your Honda
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 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
Maintenance Schedule.
Drive Chain Inspection
1. Turn the engine off, raise the rear wheel off
the ground by placing the optional workstand
or equivalent support under the engine and
shift the transmission into neutral.
2. Measure the drive chain plate (1). If the drive
chain plate is worn anywhere to a thickness of
0.53 in (13.4 mm), the drive chain must be
replaced.
(1) drive chain plate (inner)
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 lock nuts (2) and turn the
adjusting bolt (3) counterclockwise to
decreace slack or clockwise to increase slack.
Align the index mark (4) of the plates with
same reference marks (5) on both sides of the
swingarm.
(1) rear axle nut (4) index mark
(2) lock nut (5) reference marks
(3) adjusting bolt
3. Tighten the rear axle nut to the specified
torque:
94 lbf·ft (127 N·m, 13.0 kgf·m)
4. Recheck chain slack and adjust if necessary.
5. Turn the adjusting bolt counterclockwise
lightly until it touches the axle plate. Then,
tighten the lock nut to the specified torque by
holding the adjusting bolt with a wrench.
20 lbf·ft (27 N·m, 2.8 kgf·m)
0.53 in
(13.4 mm)
(1)
(5)
(4)
(3)
(2)
(1)