Honda Crf 250 M Manual

Servicing Your Honda47
Throttle
Throttle Inspection
(1) throttle
1. Check that the throttle assembly is positioned
properly and the securing bolts are tight.
2. Check for smooth rotation of the throttle (1)
from fully open to fully closed in all steering
positions.  If there is a problem, see your
Honda dealer.
3. Inspect the condition of the throttle cables
from the throttle grip down to the carburetor.
If the cable is kinked or chafed, have it
replaced.
4. Check the cables for tension or stress in all...

Engine Idle Speed
48Servicing Your Honda
The best way to assure proper carburetion is to
see your Honda dealer for regularly scheduled
servicing, including carburetor adjustment.
Remember, idle speed adjustment is not a
“cure-all” for other problems in your engine’s
fuel-delivery system. Adjusting the idle will not
compensate for a fault elsewhere.
The engine must be at normal operating
temperature for accurate idle speed adjustment.
For information about high altitude carburetor
adjustment, see page...

Servicing Your Honda49
Clutch System
Refer to Safety Precautionson page 19.
Clutch Lever Adjustment
The distance between the tip of the clutch lever
and the grip may be adjusted.
Make sure to adjust the clutch lever freeplay after
the clutch lever position adjustment or clutch
cable disconnected.
(1) lock nut (2) adjuster
1. Loosen the lock nut (1).
2. To position the clutch lever farther away from
the handgrip, turn the adjuster (2)
counterclockwise. To position the clutch lever
closer to the handgrip,...

50Servicing Your Honda
Clutch System
Other Inspections & Lubrication
•Check that the clutch lever assembly is 
positioned properly and the securing bolts are
tight.
•Check the clutch cable for kinks or signs of
wear.  If necessary, have it replaced.
•Lubricate the clutch cable with a
commercially-available cable lubricant to
prevent premature wear and corrosion.
Clutch Operation
1. Check for smooth clutch lever operation.  If
necessary, lubricate the clutch lever pivot or
clutch cable.
2. Check the...

Servicing Your Honda51
Clutch System
Clutch Disc Inspection
Replace the clutch discs (1) if they show signs of
scoring or discoloration.
Measure the thickness of each clutch disc.
Service Limit:
0.112 in (2.85 mm)
Replace the clutch discs and clutch plates as an
assembly.
(1) clutch disc
Clutch Spring Inspection
(1) clutch spring
Measure the free length of each spring.
Service Limit:
1.46 in (37.2 mm)
If one or more springs are beyond the service
limit, replace the springs as a set.
Clutch Disc/Plate...

52Servicing Your Honda
Clutch System
11. Lubricate the O-ring (9), rear brake pedal (10)
pivot and pivot bolt (11) with Honda Lithium
Grease and tighten the pivot bolt to the
specified torque:
27 lbf·ft (37 N·m, 3.8 kgf·m)
Connect the brake pedal return spring (12) if
it was removed.
(9) O-ring (11) pivot bolt
(10) rear brake pedal (12) return spring
12. Fill the crankcase with transmission oil (page
40).
(12)
(10)
(11)(9) 

Servicing Your Honda53
Hot Start Lever
Refer to Safety Precautions on page 19.
Hot Start Lever Freeplay
left handlebar
(1) hot start lever
(2) hot start lever freeplay
Inspection
Check freeplay:
1/16 – 1/8 in (2 – 3 mm)
If necessary, adjust to the specified range.Adjustment
Adjustments can be made with the cable end
adjuster.
Loosen the lock nut (3) and turn the adjuster (4).
Turning the adjuster clockwise (+) will increase
free play and turning it counterclockwise (–) will
decrease free play. After...

Refer to Safety Precautionson page 19.
Spark Plug Recommendation
The recommended standard spark plug is 
satisfactory for most racing conditions.  
Use only the recommended type of spark plugs in
the recommended heat range.
Using a spark plug with an improper heat range
or incorrect reach can cause engine damage.
Using a non-resistor spark plug may cause 
ignition problems.
This motorcycle uses a spark plug that has an
iridium tip in the center electrode and a platinum
tip in the side the electrode .
Be...

Servicing Your Honda55
Valve Clearance
Cylinder Head Cover Removal
Before inspection, clean the engine thoroughly to
keep dirt from entering the engine.
1. Remove the seat (page 29).
2. Remove the fuel tank (page 30).
3. Disconnect the breather tube (1) and spark
plug cap (2).
Positioning At Top Dead Center On The
Compression Stroke.
1. Remove the crankshaft hole cap (1).
(1) breather tube (2) spark plug cap
4. Remove the cylinder head cover bolts (3), and
cylinder head cover (4).
(3) cylinder head cover...

Valve Clearance
56Servicing Your Honda
Valve Clearance Inspection
1. Measure the intake valve clearance by
inserting a feeler gauge (1) between the valve
lifters (2) and intake cam lobe (3).2. Measure the exhaust valve clearance by
inserting a feeler gauge (1) between the
exhaust rocker arm (4) and shim (5).
(1) feeler gauge
(4) exhaust rocker arm
(5) exhaust valve shim
Valve Clearances:
IN:  
0.005 ± 0.001 in (0.12 ± 0.03 mm)
EX: 0.011 ± 0.001 in (0.28 ± 0.03 mm)
If intake valve clearance and exhaust...