Honda CRF250R User Manual

Piston/Piston Rings/Piston Pin
(cont’d)
Servicing Your Honda 79
20. Remove the cylinder head A bolts (19).
21. Loosen the cylinder bolt (20).
22. Remove the cylinder head B bolts, washers
(21) and the cylinder head (22).
Loosen the bolts in a crisscross pattern in two or
three steps.
NOTICE
Do not let the washers and cam chain fall into the
crankcase.
23. Remove the dowel pins (23) and cylinder head
gasket (24).
NOTICE
Do not let the dowel pins and cam chain fall into
the crankcase.
24. Remove the cam chain guide (25) from the
cylinder (26).
1. Remove the cylinder bolt (1) and cylinder (2).
NOTICE
Do not let the cam chain fall into the crankcase.
Do not pry on or strike the cylinder.
(19) cylinder head A bolts
(20) cylinder bolt
(21) cylinder head B bolts and washers
(22) cylinder head
(19)
(20)
(21)
(21)(22)
(23) dowel pins
(24) cylinder head gasket
(25) cam chain guide
(26) cylinder
(24)
(23)
(26)
(25)
Cylinder Removal
(1) cylinder bolt (2) cylinder
(2)
(1)

Honda CRF250R Specifications

General

Engine Type	Liquid-cooled single-cylinder four-stroke
Displacement	249cc
Bore x Stroke	79.0mm x 50.9mm
Compression Ratio	13.9:1
Starter	Electric
Transmission	Close-ratio 5-speed
Final Drive	Chain
Front Brake	Single 260mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	100/90-19
Wheelbase	58.3 inches
Seat Height	37.8 inches
Ground Clearance	13.1 inches
Fuel Capacity	1.7 gallons
Valve Train	Unicam OHC, four-valve
Induction	Programmed Fuel Injection (PGM-FI)
Throttle Bore	44mm
Ignition	Full transistorized ignition
Front Suspension	49mm inverted Showa coil-spring fork with rebound and compression damping adjustability; 12.2 inches travel
Rear Suspension	Pro-Link Showa single shock with adjustable spring preload, rebound and compression damping; 12.4 inches travel
Rake	27.2°
Trail	115mm (4.5 inches)