Honda CRF450X 2005 User Manual

CYLINDER/PISTON
PISTON REMOVAL
Places clean shop Remove the pist on pin clips with pliers.
towel ovef the
Press the piston pin out of the piston and remove
the piston.
crankcase to
prevent the clip
from falling into the • Under racing conditions, the piston and piston
rings sho uld be r ep laced according to the com-
petiti on maintenance schedule (page 4·6).
crankcase.
PISTON RING REMOVAL
Do nor damage the Spread the piston rings and remove them by lifting
piston ring by up at a point just opposite the gap.
spreading the ends
/00 faf.
10-6
CYLINDER INSPECTION
Inspect the cy linder bore for wear or damage.
Measure
the cyl inder tD. in the X and Y axes at
three levels.
Take the maximum reading to determine the c ylin -
der wear .
SERVICE LIMIT: 96.025 mm (3.7805 in)
Calculate the cylinde r- to - piston clearance.
Take a
maximum reading to determine the clear-
ance.
For piston
0.0. (page 10-7).
SERVICE
LIMIT : 0.085 mm (0.0033 in)
Calculate the taper and out -of· round at three levels
in the X and Y axes. Take the ma ximu m r eading to
determine the cy l inder condition.
SERVICE LIMITS:
Taper: 0. 010 mm (0.0004 in)
Out-oJ-round:
0.010 mm (0.0004 in)
\~- Y -~j
TOP X
......... ..-/
MIDDLE
".::= -=--------
'-- - -'--~/
BonOM
-- ;--- .......
" ,
'------ -- -- - _/
'-. /'

Honda CRF450X 2005 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Valve Train	Unicam, four-valve
Transmission	Wide-ratio five-speed
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	110/100-18
Wheelbase	58.3 inches
Seat Height	37.6 inches
Fuel Capacity	1.9 gallons
Ignition	Solid-state CD with electronic advance
Final Drive	520 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
Induction	Keihin 40mm flat-slide carburetor