Drive Chain Rollers; Adjustment; Lubrication - Honda CRF250R Owner's Manual

Drive Chain

Drive Chain Rollers

Check the upper drive chain roller (1) and lower
drive chain roller (2) for wear or damage.
Measure the diameter of the drive chain rollers and
replace them if below the service limit.
Service Limit:
Upper roller: 33 mm (1.3 in)
Lower roller: 35 mm (1.4 in)
Replace the roller if necessary as follows.
Install the upper drive chain roller (Green) with the
" " mark (3) facing toward the bracket and lower
drive chain roller (Black) with the large concave
facing outside.
Install the drive chain roller bolt and nut.
(3)
(1)
(2)
(1) upper drive chain roller (Green)
(2) lower drive chain roller (Black)
(3) " " mark
Clean the threads of the drive chain roller bolt and
apply locking agent to the threads.
Tighten the drive chain roller bolt and nut to the
specified torque:
12 N·m (1.2 kgf·m, 9 lbf·ft)
98
Servicing Your Honda

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.
(2)
(4)
(5)
(3)
(1)
(6)
(1) rear axle nut (4) index marks
(2) chain adjuster lock nuts (5) axle plates
(3) adjusting bolts (6) reference marks
3. Tighten the rear axle nut to the specified
torque:
128 N·m (13.1 kgf·m, 94 lbf·ft)
4. Recheck chain slack and adjust as necessary.
5. Turn the adjusting bolt counterclockwise until
it touches the axle plates lightly. Then tighten
the chain adjuster lock nuts to the specified
torque while holding the adjusting bolts with a
wrench.
27 N·m (2.8 kgf·m, 20 lbf·ft)

Lubrication

Commercially prepared drive chain lubricants may
be purchased at most motorcycle shops and should
be used in preference to motor oil. Drive chain
lubricant is recommended. If not available, use
SAE 80 or 90 gear oil.
Saturate each chain joint so that the lubricant
penetrates the space between adjacent surfaces of
the link plates and rollers.