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Honda CRF250R User Manual

Honda CRF250R
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Servicing Your Honda 119
Drive Chain
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: 1.3 in (33 mm)
Lower roller: 1.2 in (31 mm)
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
(4) facing outside.
Install the drive chain roller bolt (5) and nut (6).
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:
9 lbf·ft (12 N·m, 1.2 kgf·m)
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.
3. Tighten the rear axle nut to the specified
torque:
94 lbf·ft (128 N·m, 13.1 kgf·m)
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:
20 lbf·ft (27 N·m, 2.8 kgf·m)
Commercially prepared drive chain lubricants may
be purchased at most motorcycle shops and should
be used in preference to motor oil. Pro Honda HP
Chain Lube or an equivalent is recommended.
Saturate each chain joint so that the lubricant
penetrates the space between adjacent surfaces of
the link plates and rollers.
Drive Chain Rollers
(1) upper drive chain roller (Green)
(2) lower drive chain roller (Black)
(3) “ ” mark
(4) large concave
(5) drive chain roller bolt
(6) drive chain roller nut
(3)
(4)
(5)
(1)
(6)
(2)
Adjustment
(1) rear axle nut (4) index marks
(2) chain adjuster lock nuts (5) axle plates
(3) adjusting bolts (6) reference marks
(2)
(3)
(6)
(1)
(6)
(5)
(4)
Lubrication

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Honda CRF250R Specifications

General IconGeneral
Engine TypeLiquid-cooled single-cylinder four-stroke
Displacement249cc
Bore x Stroke79.0mm x 50.9mm
Compression Ratio13.9:1
StarterElectric
TransmissionClose-ratio 5-speed
Final DriveChain
Front BrakeSingle 260mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire100/90-19
Wheelbase58.3 inches
Seat Height37.8 inches
Ground Clearance13.1 inches
Fuel Capacity1.7 gallons
Valve TrainUnicam OHC, four-valve
InductionProgrammed Fuel Injection (PGM-FI)
Throttle Bore44mm
IgnitionFull transistorized ignition
Front Suspension49mm inverted Showa coil-spring fork with rebound and compression damping adjustability; 12.2 inches travel
Rear SuspensionPro-Link Showa single shock with adjustable spring preload, rebound and compression damping; 12.4 inches travel
Rake27.2°
Trail115mm (4.5 inches)

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