Honda 2004 CRF250X Service Manual

CYLINDER/PISTON
Push the nflfJ infO
the bolfom of the
cylmder USing rhe
P'StOft head to be
sure the nng IS
squarely m the
cylinde~
9-6
Temporarily install the top ring to their proper posi-
tion with the mark facing up .
Measure the piston ring-la-groove clearance with
t he ring pushed into the groove.
SERVICE LIMIT: 0. '15 mm (0.0045 in)
Inspect the piston ring grooves for wear or damage.
Measure the diameter
of the piston at 7.0 mm (0.28
in) from the bo«om and 90 degrees to the piston pin
hole.
SERVICE LIMIT: 77.940 mm (3.0685 in)
If the 0.0. is under the service limit or nearly 15.0
hours of running time have elapsed, replace the pis -
ton with a new one.
Calculate the piston-la-cylinder clearance.
SERVICE LIMIT: 0.085 mm (0.0033 in)
Measure the piston pin bore 1. 0 .
SERVICE LIMIT: 16 . 03 mm (0.631 in)
Check the piston pin for wear and excessive discol·
oration .
Measure the piston pin 0 . 0.
SERVICE LIMIT: 15.98 mm (0.629 in)
If the 0.0. is under the service limit , discolored, or
nearly 15.0 hours of running time have elapsed,
replace
the piston pin .
Calculate the pisten pin - Ie -pi ston clearance.
SERVICE LIMIT: 0.04 mm (0.002 in)
Insert each piston ring into the cylinder and mea ·
sure the ring end gap .
SERVICE LIMITS:
Tep: '04 - '06:
After ' 06 :
Oil (side rail):
0.44 mm (0. 017 in)
0 .3 9 mm (0. 015 in)
0.90 mm (0.035 in)
7.0mm
(0.28 in)
1

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