Honda 2004 CRF250X Service Manual

MAINTENANCE
S,xty-nme different
thlClmess shims are
available from
! 200 mm to 2.900
mm In int ervals of
O.025mm.
Install the shims m
thel' Oftginai
locations.
Measure the shim thickness and record it.
Calculate the new shim thickness using the equa-
tion be l ow.
A",(B-C)+D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
0 : Old shim thickness
• Make sure of the correct shim thickness by mea-
suring the shim using a micrometer.
• Reface the intake valve seat if carbon deposits
result in a calculated dimension of over 2.450
mm.
• Aeface the exhaust va lve seat if carbon deposits
result in a calculated
dimension of over 2.900
mm .
Install the newly selected shims on the valve spring
retainers.
Install the camshaft (page 8-27),
Rotate the camshaft
by rotating the crankshaft
clockwise sever al times.
Recheck the
valve clearance.
Check lhar rhe ().. Apply oil to the O-ring and install the O-ring onto
nng Is in good crankshaft hole cap.
condition, replace II Apply grease to the crankshaft hole cap threads.
I' necessary. Install and tighten the crankshaft hole cap to the
specified torque.
TORQUE: 15 N·m (1 .5 kgf· m, 11 Ibf.ft)
3-16
SHIM
\
eeee
1.80 mm 1.825 mm 1.85 mm 1.875 mm

Honda 2004 CRF250X Specifications

General

Engine Type	249cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	78.0mm x 52.2mm
Compression Ratio	12.5:1
Induction	Keihin 37mm flat-slide carburetor
Transmission	5-speed
Final Drive	O-ring-sealed chain
Front Suspension	47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Rear Suspension	Pro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and compression damping adjustment separated into low-speed (13 positions) and high-speed (3.5 turns); 12.4 inches travel
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	100/100-18
Rake (Caster Angle)	27.5°
Trail	113mm (4.4 inches)
Wheelbase	58.3 inches
Seat Height	37.7 inches
Ground Clearance	13.4 inches
Ignition	CD with electronic advance